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Prof. Dr. Patma Vityakon Rambo
Khon Kaen University, Thailand

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0 Agroforestry
0 Soil Fertility
0 Farming systems ecology
0 Decomposition ecology
0 carbon cycling in agroecosystems

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Soil Fertility
Agroforestry
Nitrogen cycling in agroecosystems

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Journal article
Published: 21 May 2021 in Agronomy
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Rice straw is an abundant resource, but its use as a sandy soil amendment does not increase soil organic matter (SOM) accumulation. Our study aimed to determine the altered decomposition processes that result from mixing rice straw (RS) (low N, high cellulose) with groundnut stover (GN) (high N) relative to applying these residues singly to a sandy soil to identify the mechanisms underlying decomposition of the mixed residues. A microcosm experiment using the litter bag technique showed synergistic, nonadditive effects (observed < predicted values) of residue mass remaining (31.1% < 40.3% initial) that were concomitant with chemical constituent loss, including C (cellulose, lignin) and N. The nonadditive effects of soil microbiological parameters in response to the applied residues were synergistic (observed > predicted values) for microbial biomass C (MBC) (92.1 > 58.4 mg C kg−1 soil) and antagonistic (observed < predicted values) for microbial metabolic quotient (i.e., the inverse of microbial C use efficiency (CUE)) (0.03 < 0.06 mmol CO2-C • mmol MBC−1 • hr−1) and N mineralization (14.8 < 16.0 mg N kg−1 soil). In the early stage of decomposition (0–14 days), mixed residues increased MBC relative to the single residues, while they decreased N mineralization relative to single GN (p ≤ 0.05). These results indicate an increase in microbial substrate CUE and N use efficiency (NUE) in the mixed residues relative to the single residues. This increased efficiency provides a basis for the synthesis of microbial products that contribute to the formation of the stable SOM pool. The SOM stabilization could bring about the SOM accumulation that is lacking under the single-RS application.

ACS Style

Wimonsiri Pingthaisong; Patma Vityakon. Nonadditive Effects on Decomposition of a Mixture of Rice Straw and Groundnut Stover Applied to a Sandy Soil. Agronomy 2021, 11, 1030 .

AMA Style

Wimonsiri Pingthaisong, Patma Vityakon. Nonadditive Effects on Decomposition of a Mixture of Rice Straw and Groundnut Stover Applied to a Sandy Soil. Agronomy. 2021; 11 (6):1030.

Chicago/Turabian Style

Wimonsiri Pingthaisong; Patma Vityakon. 2021. "Nonadditive Effects on Decomposition of a Mixture of Rice Straw and Groundnut Stover Applied to a Sandy Soil." Agronomy 11, no. 6: 1030.

Journal article
Published: 29 January 2021 in Agronomy
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Understanding phosphorus (P) dynamics in tropical sandy soil treated with organic residues of contrasting quality is crucial for P management using organic amendments. This research determined P fractions in a tropical sandy soil under the application of organic residues of different quality, including groundnut stover (GN), tamarind leaf litter (TM), dipterocarp leaf litter (DP), and rice straw (RS). The organic residues were applied at the rate of 10 t DM ha−1 year−1. The P fractions were examined by a sequential extraction procedure. Organic residue application, regardless of residue quality, resulted in P accumulation in soils. For unamended soil, 55% of total P was mainly associated with Al (hydr)oxides. Organic residue application, regardless of residue quality, diminished the NH4F-extractable P (Al-P) fraction, but it had a nonsignificant effect on NaOH-extractable P (Fe-P). The majority of Al-P and Fe-P fractions were associated with crystalline Al and Fe (hydr)oxides. NH4Cl-extractable P (labile P), NaHCO3-extractable P (exchangeable P and mineralizable organic P), HCl-extractable P (Ca-P), and residual P fractions in soil were significantly increased as a result of the incorporation of organic residues. The application of organic residues, particularly those high in ash alkalinity, increase soil pH, labile P, and Ca-P fractions. In contrast, applications of residues high in lignin and polyphenols increase residual P fraction, which is associated with organo-mineral complexes and clay mineral kaolinite.

ACS Style

Tanabhat-Sakorn Sukitprapanon; Metawee Jantamenchai; Duangsamorn Tulaphitak; Nattaporn Prakongkep; Robert John Gilkes; Patma Vityakon. Influence of Application of Organic Residues of Different Biochemical Quality on Phosphorus Fractions in a Tropical Sandy Soil. Agronomy 2021, 11, 248 .

AMA Style

Tanabhat-Sakorn Sukitprapanon, Metawee Jantamenchai, Duangsamorn Tulaphitak, Nattaporn Prakongkep, Robert John Gilkes, Patma Vityakon. Influence of Application of Organic Residues of Different Biochemical Quality on Phosphorus Fractions in a Tropical Sandy Soil. Agronomy. 2021; 11 (2):248.

Chicago/Turabian Style

Tanabhat-Sakorn Sukitprapanon; Metawee Jantamenchai; Duangsamorn Tulaphitak; Nattaporn Prakongkep; Robert John Gilkes; Patma Vityakon. 2021. "Influence of Application of Organic Residues of Different Biochemical Quality on Phosphorus Fractions in a Tropical Sandy Soil." Agronomy 11, no. 2: 248.

Journal article
Published: 27 November 2020 in Heliyon
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Intensive use of sandy soils for agriculture leads to significant land degradation. The application of locally available organic residues can improve soil fertility, particularly in the context of organic farming practices. This research examined nutrient concentrations in locally available organic residues with different biochemical compositions/qualities and investigated the effects of long-term application of these residues on available nutrients, such as P, K, Ca, Mg, Fe, Mn, and Zn, as well as on total organic carbon (TOC) accumulation in tropical sandy soil. A field experiment was conducted in Northeast Thailand, where four local organic residues, groundnut stover (GN), tamarind leaf litter (TM), dipterocarp leaf litter (DP), and rice straw (RS), had been applied annually for 22 years. These organic residues were acidic (pH 3.7–5.8). The macronutrients N, P, and K were present at elevated levels in the high-quality organic residue GN, whereas medium-quality TM and low-quality RS and DP were dominated by the macronutrients Ca and Mg and the micronutrients Fe, Mn, and Zn. The incorporation of organic residues, particularly TM, resulted in the accumulation of TOC. Furthermore, long-term incorporation of TM increased soil pH, whereas incorporation of GN, DP, and RS did not. The higher increase in the soil pH of TM soil is likely because TM contains higher levels of ash alkalinity compared to other residues. The application of medium-quality TM increased the soil available P, Ca, and Mg, whereas low-quality organic residue RS and DP applications increased the concentrations of soil micronutrients (e.g., Mn and Zn). However, long-term applications of local organic residues did not increase available K in the sandy soil.

ACS Style

Tanabhat-Sakorn Sukitprapanon; Metawee Jantamenchai; Duangsamorn Tulaphitak; Patma Vityakon. Nutrient composition of diverse organic residues and their long-term effects on available nutrients in a tropical sandy soil. Heliyon 2020, 6, e05601 .

AMA Style

Tanabhat-Sakorn Sukitprapanon, Metawee Jantamenchai, Duangsamorn Tulaphitak, Patma Vityakon. Nutrient composition of diverse organic residues and their long-term effects on available nutrients in a tropical sandy soil. Heliyon. 2020; 6 (11):e05601.

Chicago/Turabian Style

Tanabhat-Sakorn Sukitprapanon; Metawee Jantamenchai; Duangsamorn Tulaphitak; Patma Vityakon. 2020. "Nutrient composition of diverse organic residues and their long-term effects on available nutrients in a tropical sandy soil." Heliyon 6, no. 11: e05601.

Research article
Published: 01 January 2020 in Soil Research
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Soil conservation practices, such as reduced and no tillage, have been found to enhance soil nitrogen (N) sequestration through decreasing the rate of N mineralisation of added organic materials. Nitrogen mineralisation is not only affected by tillage, but also by the quality (chemical composition) of the organic residues. This study evaluated the interaction of residue quality and soil disturbance on N mineralisation in a sandy soil. A 112-day incubation experiment was conducted with two levels of soil disturbance (undisturbed and disturbed conditions) and five plant residue amendments of contrasting quality. The contrasting quality (N, lignin (L), and polyphenols (Pp)) (in g kg–1) amendments follow: (i) unamended; (ii) Sesbania grandiflora (N 44, L 173, Pp 9.2); (iii) Indigofera hirsuta (N 41, L 177, Pp 30); (iv) Dipterocarpus tuberculatus (N 8.2, L 203, Pp 71); and (v) Eucalyptus camaldulensis (N 9.7, L 126, Pp 110). Residues (ii) and (iii) were fresh legume leaves, while (iv) and (v) were non-legume leaf litter. Disturbance only significantly increased N mineralisation rates in the legume-residue treated soils (increases of 18.8% for S. grandiflora and 27.1% for I. hirsuta) during the early stage of decomposition (first 14 days). In the legume treatment, disturbance significantly increased the ammonification, but decreased nitrification in soil relative to undisturbed soils. The difference in patterns of ammonification and nitrification was more pronounced in the early than in the later period of decomposition. This indicated an inhibitory effect of soil disturbance on nitrification, which was particularly pronounced in the legume-treated soils. The Pp content of residues was the major quality parameter regulating the soil ammonium-N and nitrate-N concentrations. Minimum soil disturbance should be adopted under legume soil organic amendment so that both ammonification and nitrification components of N mineralisation process can occur normally, and nitrate-loving crops can take up N in the form of nitrate-N which will enhance their yields. Moreover, undisturbed conditions under legume organic amendments reduced N mineralisation, resulting in enhancing soil N sequestration.

ACS Style

Somchai Butnan; Patma Vityakon. The interactive effects of soil disturbance and residue quality on soil nitrogen mineralisation in a tropical sandy soil. Soil Research 2020, 58, 277 .

AMA Style

Somchai Butnan, Patma Vityakon. The interactive effects of soil disturbance and residue quality on soil nitrogen mineralisation in a tropical sandy soil. Soil Research. 2020; 58 (3):277.

Chicago/Turabian Style

Somchai Butnan; Patma Vityakon. 2020. "The interactive effects of soil disturbance and residue quality on soil nitrogen mineralisation in a tropical sandy soil." Soil Research 58, no. 3: 277.

Journal article
Published: 01 January 2020 in Soil Research
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Soil conservation practices, such as reduced and no tillage, have been found to enhance soil nitrogen (N) sequestration through decreasing the rate of N mineralisation of added organic materials. Nitrogen mineralisation is not only affected by tillage, but also by the quality (chemical composition) of the organic residues. This study evaluated the interaction of residue quality and soil disturbance on N mineralisation in a sandy soil. A 112-day incubation experiment was conducted with two levels of soil disturbance (undisturbed and disturbed conditions) and five plant residue amendments of contrasting quality. The contrasting quality (N, lignin (L), and polyphenols (Pp)) (in g kg–1) amendments follow: (i) unamended; (ii) Sesbania grandiflora (N 44, L 173, Pp 9.2); (iii) Indigofera hirsuta (N 41, L 177, Pp 30); (iv) Dipterocarpus tuberculatus (N 8.2, L 203, Pp 71); and (v) Eucalyptus camaldulensis (N 9.7, L 126, Pp 110). Residues (ii) and (iii) were fresh legume leaves, while (iv) and (v) were non-legume leaf litter. Disturbance only significantly increased N mineralisation rates in the legume-residue treated soils (increases of 18.8% for S. grandiflora and 27.1% for I. hirsuta) during the early stage of decomposition (first 14 days). In the legume treatment, disturbance significantly increased the ammonification, but decreased nitrification in soil relative to undisturbed soils. The difference in patterns of ammonification and nitrification was more pronounced in the early than in the later period of decomposition. This indicated an inhibitory effect of soil disturbance on nitrification, which was particularly pronounced in the legume-treated soils. The Pp content of residues was the major quality parameter regulating the soil ammonium-N and nitrate-N concentrations. Minimum soil disturbance should be adopted under legume soil organic amendment so that both ammonification and nitrification components of N mineralisation process can occur normally, and nitrate-loving crops can take up N in the form of nitrate-N which will enhance their yields. Moreover, undisturbed conditions under legume organic amendments reduced N mineralisation, resulting in enhancing soil N sequestration.

ACS Style

Somchai Butnan; Patma Vityakon. The interactive effects of soil disturbance and residue quality on soil nitrogen mineralisation in a tropical sandy soil. Soil Research 2020, 58, 277 .

AMA Style

Somchai Butnan, Patma Vityakon. The interactive effects of soil disturbance and residue quality on soil nitrogen mineralisation in a tropical sandy soil. Soil Research. 2020; 58 (3):277.

Chicago/Turabian Style

Somchai Butnan; Patma Vityakon. 2020. "The interactive effects of soil disturbance and residue quality on soil nitrogen mineralisation in a tropical sandy soil." Soil Research 58, no. 3: 277.

Journal article
Published: 10 September 2019 in European Journal of Soil Science
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ACS Style

Benjapon Kunlanit; Frank Rasche; Aunnop Puttaso; Georg Cadisch; Patma Vityakon. Vertical dynamics of dissolved organic carbon in relation to organic input quality and microaggregate formation in a coarse- textured Ultisol. European Journal of Soil Science 2019, 71, 459 -471.

AMA Style

Benjapon Kunlanit, Frank Rasche, Aunnop Puttaso, Georg Cadisch, Patma Vityakon. Vertical dynamics of dissolved organic carbon in relation to organic input quality and microaggregate formation in a coarse- textured Ultisol. European Journal of Soil Science. 2019; 71 (3):459-471.

Chicago/Turabian Style

Benjapon Kunlanit; Frank Rasche; Aunnop Puttaso; Georg Cadisch; Patma Vityakon. 2019. "Vertical dynamics of dissolved organic carbon in relation to organic input quality and microaggregate formation in a coarse- textured Ultisol." European Journal of Soil Science 71, no. 3: 459-471.

Journal article
Published: 06 September 2019 in Agronomy
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Soil capacity as a major carbon (C) sink is influenced by land use. Estimates of soil organic carbon (SOC) sequestration have mostly focused on topsoils [0–30 cm official Intergovernmental Panel on Climate Change (IPCC) soil depth]. We investigated SOC stocks and their quality as influenced by land-use changes. Soil samples were collected from five soil depths down to 100 cm of three adjacent fields each representing a different land use—forest, cassava, and rice paddy—in Northeast Thailand. Sequestration of SOC in topsoils under all land uses was higher, as indicated by SOC stocks (59.0–82.0 Mg ha−1) than subsoils (30–100 cm) (27.0–33.0 Mg ha−1). The soil profile (0–100 cm) of the forest had higher stocks of SOC and humic acid (115.0 and 6.8 Mg ha−1, respectively) than those of cultivated land uses [paddy (100.0 and 4.8 Mg ha−1, respectively) and cassava (87.0 and 2.3 Mg ha−1, respectively)], which accounted for an average 30% increase in SOC sequestration over those with only topsoil. Topsoils of the forest had higher humic acid content but narrower E4:E6 ratio [the ratio of absorbances at 465 nm (E4) and at 665 nm (E6)] of humic acids (2.8), indicating a higher degree of humification and stabilization than the cultivated soils (3.2–3.6). Subsoil C was higher quality, as indicated by the lower E4:E6 ratio of humic acids than topsoils in all land uses.

ACS Style

Benjapon Kunlanit; Somchai Butnan; Patma Vityakon. Land–Use Changes Influencing C Sequestration and Quality in Topsoil and Subsoil. Agronomy 2019, 9, 520 .

AMA Style

Benjapon Kunlanit, Somchai Butnan, Patma Vityakon. Land–Use Changes Influencing C Sequestration and Quality in Topsoil and Subsoil. Agronomy. 2019; 9 (9):520.

Chicago/Turabian Style

Benjapon Kunlanit; Somchai Butnan; Patma Vityakon. 2019. "Land–Use Changes Influencing C Sequestration and Quality in Topsoil and Subsoil." Agronomy 9, no. 9: 520.

Journal article
Published: 06 May 2019 in Agronomy
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Little is known about the carbonaceous greenhouse gases and soil microbial community linked to the combination of biochar (BC) and rice straw (RS) in paddy soils. The objectives of this research were to evaluate the effects of combining BC and RS on (1) CH4 and CO2 production from paddy soil, (2) archaeal and bacterial abundance, and (3) rice grain yield. The experiments consisted of a pot trial and an incubation trial, which had a completely randomized design. The experiments included five treatments with three replications: (a) the control (without BC, RS, and chemical fertilizer (CF)); (b) CF; (c) BC 12.50 t ha−1; (d) RS 12.50 t ha−1; and (e) combined BC 6.25 t ha−1 + RS 6.25 t ha−1 + CF. In the sole RS treatment, CH4 production (0.0347 mg m−2 season−1) and the archaeal and bacterial abundance (5.81 × 108 and 4.94 × 1010 copies g−1 soil dry weight (DW)) were higher than outcomes in the sole BC treatment (i.e., 0.0233 mg m−2 season−1 for CH4 production, and 8.51 × 107 and 1.76 × 1010 copies g−1 soil DW for archaeal and bacterial abundance, respectively). CH4 production (0.0235 mg m−2 season−1) decreased significantly in the combined BC + RS + CF treated soil compared to the soil treated with RS alone, indicating that BC lessened CH4 production via CH4 adsorption, methanogenic activity inhibition, and microbial CH4 oxidation through bacterial methanotrophs. However, the archaeal abundance (3.79–5.81 × 108 copies g−1 soil DW) and bacterial abundance (4.94–5.82 × 1010 copies g−1 soil DW) in the combined BC+ RS + CF treated soil and the RS treated soil were found to increase relative to the treatments without RS. The increase was due to the easily decomposable RS and the volatile matter (VM) constituent of the BC. Nevertheless, the resultant CO2 production was relatively similar amongst the BC, RS, and BC + RS treated soils, which was indicative of several processes, e.g., the CO2 production and reduction that occurred simultaneously but in different directions. Moreover, the highest yield of rice grains was obtained from a combined BC + RS + CF treated soil and it was 53.47 g pot−1 (8.48 t ha−1). Over time, the addition of BC to RS soil enhanced the archaeal and bacterial abundance, thereby improving yields and reducing CH4 emissions.

ACS Style

Supitrada Kumputa; Patma Vityakon; Patcharee Saenjan; Phrueksa Lawongsa. Carbonaceous Greenhouse Gases and Microbial Abundance in Paddy Soil under Combined Biochar and Rice Straw Amendment. Agronomy 2019, 9, 228 .

AMA Style

Supitrada Kumputa, Patma Vityakon, Patcharee Saenjan, Phrueksa Lawongsa. Carbonaceous Greenhouse Gases and Microbial Abundance in Paddy Soil under Combined Biochar and Rice Straw Amendment. Agronomy. 2019; 9 (5):228.

Chicago/Turabian Style

Supitrada Kumputa; Patma Vityakon; Patcharee Saenjan; Phrueksa Lawongsa. 2019. "Carbonaceous Greenhouse Gases and Microbial Abundance in Paddy Soil under Combined Biochar and Rice Straw Amendment." Agronomy 9, no. 5: 228.

Journal article
Published: 01 December 2017 in Agriculture and Natural Resources
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A pot experiment involving growing three consecutive corn crops in two contrasting tropical soils—a coarse-textured, Al-rich Ultisol and a fine-textured, Mn-rich Oxisol—treated with two eucalyptus wood biochars—at low (350 °C) and high (800 °C) pyrolysis temperatures—at weight per weight rates of 0%, 1%, 2% and 4%, was conducted to assess their effects on the soil organic carbon (SOC) stability (soil C remaining relative to initial soil C) 144 d after biochar application (after the third crop harvest). The low temperature biochar had higher volatile matter but lower ash and fixed C contents than its high temperature counterpart. In the Ultisol, the SOC stability significantly increased with both biochars at up to the 2% rate but beyond which it did not further increase, whereas, in the Oxisol, the SOC stability significantly decreased at all rates of high temperature biochar and at the 2% and 4% rates of the low temperature biochar. Proposed mechanisms underlying these contrasting responses of the two soils involve their different buffering capacities and their mineralogy in relation to the Al in the Ultisol and the Mn in the Oxisol interacting with the different contents of the three main biochar constituents (volatile matter, ash and fixed C) of the two biochars.

ACS Style

Somchai Butnan; Jonathan L. Deenik; Banyong Toomsan; Patma Vityakon. Biochar properties affecting carbon stability in soils contrasting in texture and mineralogy. Agriculture and Natural Resources 2017, 51, 492 -498.

AMA Style

Somchai Butnan, Jonathan L. Deenik, Banyong Toomsan, Patma Vityakon. Biochar properties affecting carbon stability in soils contrasting in texture and mineralogy. Agriculture and Natural Resources. 2017; 51 (6):492-498.

Chicago/Turabian Style

Somchai Butnan; Jonathan L. Deenik; Banyong Toomsan; Patma Vityakon. 2017. "Biochar properties affecting carbon stability in soils contrasting in texture and mineralogy." Agriculture and Natural Resources 51, no. 6: 492-498.

Journal article
Published: 01 September 2016 in Journal of Environmental Quality
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The ability of biochar applications to alter greenhouse gases (GHGs) (CO, CH, and NO) has been attracting research interest. However, inconsistent published results necessitate further exploration of potential influencing factors, including biochar properties, biochar rates, soil textures and mineralogy, and their interactions. Two short-term laboratory incubations were conducted to evaluate the effects of different biochars: a biochar with low ash (2.4%) and high-volatile matter (VM) (35.8%) contents produced under low-temperature (350°C) traditional kiln and a biochar with high ash (3.9%) and low-VM (14.7%) contents produced with a high-temperature (800°C) Flash Carbonization reactor and different biochar rates (0, 2, and 4% w/w) on the GHG emissions in a loamy-sand Ultisol and a silty-clay-loam Oxisol. In the coarse-textured, low-buffer Ultisol, cumulative CO and CH emissions increased with increasing VM content of biochars; however, CO emission sharply decreased at 83 μg VM g soil. In the fine-textured, high-buffer Oxisol, there were significant positive effects of VM content on cumulative CO emission without suppression effects. Regarding cumulative NO emission, there were significant positive effects in the Mn-rich Oxisol. Ash-induced increases in soil pH had negative effects on all studied GHG emissions. Possible mechanisms include the roles biochar VM played as microbial substrates, a source of toxic compounds and complexing agents reducing the toxicity of soil aluminum and manganese, and the role of biochar ash in increasing soil pH affecting GHG emissions in these two contrasting soils.

ACS Style

Somchai Butnan; Jonathan L. Deenik; Banyong Toomsan; Michael J. Antal; Patma Vityakon. Biochar Properties Influencing Greenhouse Gas Emissions in Tropical Soils Differing in Texture and Mineralogy. Journal of Environmental Quality 2016, 45, 1509 -1519.

AMA Style

Somchai Butnan, Jonathan L. Deenik, Banyong Toomsan, Michael J. Antal, Patma Vityakon. Biochar Properties Influencing Greenhouse Gas Emissions in Tropical Soils Differing in Texture and Mineralogy. Journal of Environmental Quality. 2016; 45 (5):1509-1519.

Chicago/Turabian Style

Somchai Butnan; Jonathan L. Deenik; Banyong Toomsan; Michael J. Antal; Patma Vityakon. 2016. "Biochar Properties Influencing Greenhouse Gas Emissions in Tropical Soils Differing in Texture and Mineralogy." Journal of Environmental Quality 45, no. 5: 1509-1519.

Journal article
Published: 01 May 2016 in Agriculture and Natural Resources
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This study aimed to clarify the effects of biochar (BC made from Eucalyptus camaldulensis Dehnh.), and rice (Orysa sativa L.) straw (RS) amendments on the soil productivity, carbon sequestration (Cseq) and the possibility for mitigating greenhouse gas (GHG) emissions. A field trial was conducted with 10 treatments: the control, chemical fertilizer (CF) and BC or RS each at four rates of L (6.25 t/ha), ML (12.50 t/ha), MH (18.75 t/ha) and H (25.00 t/ha) using a randomized complete block design with four replicates. The results showed that BC and RS not only increased the soil quality but also increased the rice yield (RY). During the growing season, BC and RS applications did not differ in the total CO2 emission. However, the total CH4 emission and total global warming potential significantly decreased in the BC application and significantly increased in the RS application, relative to the control. Soil Cseq increased under the BC application by 1.87–13.37 t C/ha, while the RS application reduced Cseq by 0.92–2.56 t C/ha. The high amount of recalcitrant C molecules in BC probably explained the decreases in the GHG-C loss and increases in Cseq. In contrast, RS had high amounts of labile components that enhanced the GHG-C emission and reduced Cseq. Finally, the GHG intensity of rice production was reduced for both BC and RS meaning that these two amendments can be considered as good options for the mitigation of climate change.

ACS Style

Nipa Thammasom; Patma Vityakon; Phrueksa Lawongsa; Patcharee Saenjan. Biochar and rice straw have different effects on soil productivity, greenhouse gas emission and carbon sequestration in Northeast Thailand paddy soil. Agriculture and Natural Resources 2016, 50, 192 -198.

AMA Style

Nipa Thammasom, Patma Vityakon, Phrueksa Lawongsa, Patcharee Saenjan. Biochar and rice straw have different effects on soil productivity, greenhouse gas emission and carbon sequestration in Northeast Thailand paddy soil. Agriculture and Natural Resources. 2016; 50 (3):192-198.

Chicago/Turabian Style

Nipa Thammasom; Patma Vityakon; Phrueksa Lawongsa; Patcharee Saenjan. 2016. "Biochar and rice straw have different effects on soil productivity, greenhouse gas emission and carbon sequestration in Northeast Thailand paddy soil." Agriculture and Natural Resources 50, no. 3: 192-198.

Journal article
Published: 01 January 2015 in Geoderma
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ACS Style

Somchai Butnan; Jonathan L. Deenik; Banyong Toomsan; Michael J. Antal; Patma Vityakon. Biochar characteristics and application rates affecting corn growth and properties of soils contrasting in texture and mineralogy. Geoderma 2015, 237-238, 105 -116.

AMA Style

Somchai Butnan, Jonathan L. Deenik, Banyong Toomsan, Michael J. Antal, Patma Vityakon. Biochar characteristics and application rates affecting corn growth and properties of soils contrasting in texture and mineralogy. Geoderma. 2015; 237-238 ():105-116.

Chicago/Turabian Style

Somchai Butnan; Jonathan L. Deenik; Banyong Toomsan; Michael J. Antal; Patma Vityakon. 2015. "Biochar characteristics and application rates affecting corn growth and properties of soils contrasting in texture and mineralogy." Geoderma 237-238, no. : 105-116.

Journal article
Published: 01 September 2014 in Soil Biology and Biochemistry
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ACS Style

Benjapon Kunlanit; Patma Vityakon; Aunnop Puttaso; Georg Cadisch; Frank Rasche. Mechanisms controlling soil organic carbon composition pertaining to microbial decomposition of biochemically contrasting organic residues: Evidence from midDRIFTS peak area analysis. Soil Biology and Biochemistry 2014, 76, 100 -108.

AMA Style

Benjapon Kunlanit, Patma Vityakon, Aunnop Puttaso, Georg Cadisch, Frank Rasche. Mechanisms controlling soil organic carbon composition pertaining to microbial decomposition of biochemically contrasting organic residues: Evidence from midDRIFTS peak area analysis. Soil Biology and Biochemistry. 2014; 76 ():100-108.

Chicago/Turabian Style

Benjapon Kunlanit; Patma Vityakon; Aunnop Puttaso; Georg Cadisch; Frank Rasche. 2014. "Mechanisms controlling soil organic carbon composition pertaining to microbial decomposition of biochemically contrasting organic residues: Evidence from midDRIFTS peak area analysis." Soil Biology and Biochemistry 76, no. : 100-108.

Journal article
Published: 27 November 2013 in Environmental Management
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The widespread presence of trees in paddy fields is a unique feature of Northeast Thailand’s agricultural landscape. A survey of spatial variability in the density of trees in paddy fields in the Northeast Region was conducted utilizing high resolution satellite images and found that the mean density in the whole region was 12.1 trees/ha (varying from a high of 44.6 trees/ha to a low of 0.8 trees/ha). In general, tree densities are higher in the southeastern part of the region and much lower in the northern central part. Tree density was influenced by multiple factors including: (1) the history of land development, with more recently developed paddy fields having higher densities, (2) topography, with fields located at higher topographical positions having a higher mean density of trees, (3) access to natural forest resources, with fields in areas located close to natural forests having higher densities, (4) amount of annual rainfall, with fields in areas with higher average annual rainfall having higher tree densities, and (5) landholding size, with fields in areas with larger-sized landholdings having more trees. However, there is a considerable extent of co-variation among these factors. Although trees remain an important element of the paddy field landscape in the Northeast, it appears that their density has been declining in recent years. If this trend continues, then the vast “invisible forest” represented by trees in paddy fields may truly disappear, with negative consequences for the villagers’ livelihoods, biodiversity conservation, and carbon sequestration in the rural ecosystem.

ACS Style

Moriaki Watanabe; Patma Vityakon; A. Terry Rambo. Can’t See the Forest for the Rice: Factors Influencing Spatial Variations in the Density of Trees in Paddy Fields in Northeast Thailand. Environmental Management 2013, 53, 343 -356.

AMA Style

Moriaki Watanabe, Patma Vityakon, A. Terry Rambo. Can’t See the Forest for the Rice: Factors Influencing Spatial Variations in the Density of Trees in Paddy Fields in Northeast Thailand. Environmental Management. 2013; 53 (2):343-356.

Chicago/Turabian Style

Moriaki Watanabe; Patma Vityakon; A. Terry Rambo. 2013. "Can’t See the Forest for the Rice: Factors Influencing Spatial Variations in the Density of Trees in Paddy Fields in Northeast Thailand." Environmental Management 53, no. 2: 343-356.

Journal article
Published: 19 April 2013 in Soil Science Society of America Journal
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The influence of residue quality on soil organic C (SOC) retention has been called into question. A field experiment in Northeast Thailand, in which contrasting quality organic residues were applied yearly for 13 yr, was used to determine quantities, locations, and stability of SOC in the soil matrix and identify residue quality parameters affecting SOC stabilization in a tropical sandy-textured soil. Total organic C (TOC) content was highest in intermediate-quality tamarind (Tamarindus indica L.) at 3.58 g kg−1 (intermediate N, lignin, and polyphenol contents), followed by groundnut (Arachis hypogaea L.) stover at 2.63 g kg−1 (high N), dipterocarp (Dipterocarpus tuberculatus Roxb.) at 2.63 g kg−1 (low N, high lignin and polyphenols), and rice (Oryza sativa L.) straw at 1.77 g kg−1 (high cellulose). Microaggregates (Mi) (0.053–0.25 mm) stored the highest C content (34–49% of TOC), with tamarind having the highest C content. Carbon in large macroaggregates (>2 mm), small macroaggregates (0.25–2 mm), and free organic matter (>0.053 mm) was significantly positively correlated with C, lignin, and polyphenols. Carbon in microaggregates and fine particles (<0.053 mm) was significantly negatively correlated with C/N ratio. Soil fraction C was negatively correlated with residue cellulose contents. Protected C lost through mineralization in Mi was lower in tamarind (7% Mi-C) followed by groundnut (9.5%), dipterocarp (17.7%), and rice straw (18.6%). It was significantly positively correlated with cellulose and C/N ratios but negatively correlated with N contents. Possible mechanisms of aggregate formation are based on microbial synthesis of both persistent (humic substances) and transient (polysaccharides) binding agents as influenced by residue quality. The results showed clearly that residue quality plays an important role in SOC accumulation in tropical sandy soils. Copyright © 2013. . Copyright © by the Soil Science Society of America, Inc.

ACS Style

Aunnop Puttaso; Patma Vityakon; Frank Rasche; Patcharee Saenjan; Vidhaya Treloges; Georg Cadisch. Does Organic Residue Quality Influence Carbon Retention in a Tropical Sandy Soil? Soil Science Society of America Journal 2013, 77, 1001 -1011.

AMA Style

Aunnop Puttaso, Patma Vityakon, Frank Rasche, Patcharee Saenjan, Vidhaya Treloges, Georg Cadisch. Does Organic Residue Quality Influence Carbon Retention in a Tropical Sandy Soil? Soil Science Society of America Journal. 2013; 77 (3):1001-1011.

Chicago/Turabian Style

Aunnop Puttaso; Patma Vityakon; Frank Rasche; Patcharee Saenjan; Vidhaya Treloges; Georg Cadisch. 2013. "Does Organic Residue Quality Influence Carbon Retention in a Tropical Sandy Soil?" Soil Science Society of America Journal 77, no. 3: 1001-1011.

Journal article
Published: 12 March 2013 in Biology and Fertility of Soils
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The regulative effect of long-term application of biochemically contrasting organic inputs such as rice straw (4.7 g N; 6.5 g polyphenols), groundnut stover (22.8 g N; 12.9 g polyphenols) and leaf litter of tamarind (13.6 g N; 31.5 g polyphenols) and dipterocarp (5.7 g N; 64.9 g polyphenols) on fungal decomposers was studied in a tropical sandy soil. Fungal decomposers were assayed by 18S rRNA gene-based community profiling and were combined with measurements of selected enzyme activities. Dipterocarp residue application depressed fungal abundance, but promoted specialized decomposers (e.g., Aspergillus fumigatus and Anguillospora longissima) with increases in polyphenol oxidase activity. The degree of functional redundancy for invertase and B-glucosidase activities was induced after the addition of easily decomposable rice straw and groundnut stover. Higher N availability in the tamarind treatment increased, in contrast to low N rice straw, fungal abundance (i.e., Fusarium oxysporum, Myceliopthora thermophila, and Aspergillus versicolor) and promoted invertase and B-glucosidase activities, while peroxidase activity was depressed. In addition, N availability seemed to regulate not only decomposing soil fungi, but also the abundance of protozoan decomposers whose actual contribution to N turnover in soils is still poorly understood. Prospective research should thus consider apart from studying decomposing fungi also protozoa and bacteria to better understand the microbially mediated degradation of complex organic materials in soils.

ACS Style

Bhanudacha Kamolmanit; Patma Vityakon; Wanwipa Kaewpradit; Georg Cadisch; Frank Rasche. Soil fungal communities and enzyme activities in a sandy, highly weathered tropical soil treated with biochemically contrasting organic inputs. Biology and Fertility of Soils 2013, 49, 905 -917.

AMA Style

Bhanudacha Kamolmanit, Patma Vityakon, Wanwipa Kaewpradit, Georg Cadisch, Frank Rasche. Soil fungal communities and enzyme activities in a sandy, highly weathered tropical soil treated with biochemically contrasting organic inputs. Biology and Fertility of Soils. 2013; 49 (7):905-917.

Chicago/Turabian Style

Bhanudacha Kamolmanit; Patma Vityakon; Wanwipa Kaewpradit; Georg Cadisch; Frank Rasche. 2013. "Soil fungal communities and enzyme activities in a sandy, highly weathered tropical soil treated with biochemically contrasting organic inputs." Biology and Fertility of Soils 49, no. 7: 905-917.

Journal article
Published: 17 July 2010 in Nutrient Cycling in Agroecosystems
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The objectives of this study were to investigate decomposition patterns and soil organic matter (SOM) accumulation of incorporated residues (10 Mg ha−1 year−1) of different quality, and identify microbiological parameters sensitive to changes in SOM dynamics, in a 13-year-old field experiment on a sandy soil in Northeast Thailand. Mass loss was fastest in groundnut stover (high N), followed by rice straw (high cellulose) and tamarind (intermediate quality), and slowest in dipterocarp (high lignin and polyphenol) following a double exponential pattern. The decomposition rate k 1 (fast pool) was positively correlated with cellulose (r = 0.70*) while k 2 (slow pool) was negatively related to lignin (r = −0.85***) and polyphenol (r = −0.81**) contents of residues. Residue decomposition was sensitive to indigenous soil organic nitrogen (SON), particularly during later stages (R 2 = 0.782**). Thirteen years’ addition of tamarind residues led to largest soil organic carbon (SOC) (8.41 Mg ha−1) accumulation in topsoil (0–20 cm), while rice straw yielded only 5.54 Mg ha−1 followed by the control (2.72 Mg ha−1). The highest SON (0.78 Mg N ha−1) was observed in the groundnut treatment. Increases in SOC were negatively correlated with cellulose content of residues (r = −0.92***) and microbial respiration (CO2-C) losses, while SON was governed by organic N added. During later decomposition stages, there was a high efficiency of C utilization (low qCO2) of decomposer communities especially under tamarind with the lowest qCO2 and CO2-C evolution loss. This study suggests that N-rich residues with low cellulose and moderate lignin and polyphenol contents are best suited to improve SOM content in tropical sandy soils.

ACS Style

A. Puttaso; P. Vityakon; P. Saenjan; V. Trelo-Ges; G. Cadisch. Relationship between residue quality, decomposition patterns, and soil organic matter accumulation in a tropical sandy soil after 13 years. Nutrient Cycling in Agroecosystems 2010, 89, 159 -174.

AMA Style

A. Puttaso, P. Vityakon, P. Saenjan, V. Trelo-Ges, G. Cadisch. Relationship between residue quality, decomposition patterns, and soil organic matter accumulation in a tropical sandy soil after 13 years. Nutrient Cycling in Agroecosystems. 2010; 89 (2):159-174.

Chicago/Turabian Style

A. Puttaso; P. Vityakon; P. Saenjan; V. Trelo-Ges; G. Cadisch. 2010. "Relationship between residue quality, decomposition patterns, and soil organic matter accumulation in a tropical sandy soil after 13 years." Nutrient Cycling in Agroecosystems 89, no. 2: 159-174.

Journal article
Published: 21 March 2010 in Land Degradation & Development
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Particulate organic matter (POM) plays important role in soil organic carbon (SOC) retention and soil aggregation. This paper assesses how quality (chemical composition) of four different‐quality organic residues applied annually to a tropical sandy loam soil for 10 years has affected POM pools and the development of soil aggregates. Water‐stable aggregate size distribution (>2, 0·25–2, 0·106–0·25 mm) was determined through wet sieving. Density fractionation was employed to determine POM (light—LF, and heavy—HF fractions, 0·05–1 mm). Tamarind leaf litter showed the highest SOC (2 mm). Rice straw had the lowest quantities of both macroaggregates. Similar to small‐sized HF (0·05–0·25 mm), small macroaggregates had positive correlation with N and negative correlation with C/N ratios, while large macroaggregates had positive correlations with C and recalcitrant constituents of the residues. Tamarind, with intermediate contents of N and recalcitrant compounds, appears to best promote small macroaggregate formation. Carbon stabilized in small macroaggregates accounted for the tamarind treatment showing the largest SOC accumulation. Copyright © 2010 John Wiley & Sons, Ltd.

ACS Style

P. Samahadthai; Patma Vityakon; P. Saenjan. Effects of different quality plant residues on soil carbon accumulation and aggregate formation in a tropical sandy soil in Northeast Thailand as revealed by a 10-year field experiment. Land Degradation & Development 2010, 21, 463 -473.

AMA Style

P. Samahadthai, Patma Vityakon, P. Saenjan. Effects of different quality plant residues on soil carbon accumulation and aggregate formation in a tropical sandy soil in Northeast Thailand as revealed by a 10-year field experiment. Land Degradation & Development. 2010; 21 (5):463-473.

Chicago/Turabian Style

P. Samahadthai; Patma Vityakon; P. Saenjan. 2010. "Effects of different quality plant residues on soil carbon accumulation and aggregate formation in a tropical sandy soil in Northeast Thailand as revealed by a 10-year field experiment." Land Degradation & Development 21, no. 5: 463-473.

Journal article
Published: 10 February 2009 in Field Crops Research
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W. Kaewpradit; B. Toomsan; G. Cadisch; Patma Vityakon; V. Limpinuntana; P. Saenjan; S. Jogloy; A. Patanothai. Mixing groundnut residues and rice straw to improve rice yield and N use efficiency. Field Crops Research 2009, 110, 130 -138.

AMA Style

W. Kaewpradit, B. Toomsan, G. Cadisch, Patma Vityakon, V. Limpinuntana, P. Saenjan, S. Jogloy, A. Patanothai. Mixing groundnut residues and rice straw to improve rice yield and N use efficiency. Field Crops Research. 2009; 110 (2):130-138.

Chicago/Turabian Style

W. Kaewpradit; B. Toomsan; G. Cadisch; Patma Vityakon; V. Limpinuntana; P. Saenjan; S. Jogloy; A. Patanothai. 2009. "Mixing groundnut residues and rice straw to improve rice yield and N use efficiency." Field Crops Research 110, no. 2: 130-138.

Journal article
Published: 28 September 2008 in Nutrient Cycling in Agroecosystems
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To reduce greenhouse gas emissions farmers are being encouraged not to burn sugarcane residues. An experiment was set up in NE Thailand, where sugarcane residues of the last ratoon crop were either burned, surface mulched or incorporated and subsequently the field left fallow or planted to groundnut or soybean. The objectives of the current experiment were to evaluate the residual effects of these treatments during the following new sugarcane crop on (i) microbial and mineral N dynamics, (ii) performance of sugarcane and (iii) effectiveness of recycled legume residues compared to mineral N fertilizer on N use efficiencies, 15N recovery in the system and in soil particle size and density fractions (using 15N labelled legume residues and fertilizer). The millable cane and sugar yield were positively affected by sugarcane residue mulching and incorporation compared to burning suggesting microbial remobilization of previously immobilized N. Residual effects of legumes increased sugarcane tillering and yield (127 and 116 Mg ha−1 for groundnut and soybean, respectively) compared to the fallow treatment without N fertilizer (112 Mg ha−1). Soybean residues of higher C:N ratio (33:1) and lignin content (13%) compared to groundnut residues (21:1 C:N, 5% lignin) decomposed slower and improved N synchrony with cane N demand. This led to a better conservation of residue N in the system with proportionally less 15N losses (15–17%) compared to the large losses from groundnut residues (50–57%) or from mineral N fertilizer (50–63%). 15N recoveries in soil were larger from residues (41–80%) than from fertilizer (30%) at final harvest. Recycled legume residues were able to substitute basal fertilizer N application but not topdressing after 6 months.

ACS Style

S. Hemwong; B. Toomsan; G. Cadisch; V. Limpinuntana; P. Vityakon; A. Patanothai. Sugarcane residue management and grain legume crop effects on N dynamics, N losses and growth of sugarcane. Nutrient Cycling in Agroecosystems 2008, 83, 135 -151.

AMA Style

S. Hemwong, B. Toomsan, G. Cadisch, V. Limpinuntana, P. Vityakon, A. Patanothai. Sugarcane residue management and grain legume crop effects on N dynamics, N losses and growth of sugarcane. Nutrient Cycling in Agroecosystems. 2008; 83 (2):135-151.

Chicago/Turabian Style

S. Hemwong; B. Toomsan; G. Cadisch; V. Limpinuntana; P. Vityakon; A. Patanothai. 2008. "Sugarcane residue management and grain legume crop effects on N dynamics, N losses and growth of sugarcane." Nutrient Cycling in Agroecosystems 83, no. 2: 135-151.