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Stephen Yeboah
CSIR-Crops Research Institute, Kumasi, Ghana

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Journal article
Published: 25 March 2021 in Crop Protection
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Maize (Zea mays L.) production is constrained in Ghana by declining soil fertility, erratic rainfall and the recent fall armyworm invasion. We hypothesised that adopting push-pull farming practices would reduce infestation and damage of maize by fall armyworm, while increasing maize yield. We conducted field experiments at two sites over two cropping seasons to evaluate the effects of spatial arrangements of push-pull companion crops on fall armyworm infestations and grain yield of maize. The experiment was arranged in a split-plot design with variety (Abotem and Opeaburo) as the main plot and fall armyworm treatment options (1 row maize and 1 row Desmodium [conventional push-pull]; three maize rows before one row of Desmodium [modified push-pull]; synthetic chemical and no treatment [control]) as a subplot. Results showed that, regardless of location or maize variety, both conventional and spatially modified push-pull companion cropping significantly reduced fall armyworm infestations under all seasons, as compared with the control. The push-pull companion cropping systems reduced the mean maize damage score of fall armyworm by 168%, compared with the control. Additionally, both conventional and spatially modified push-pull companion cropping significantly increased maize grain and biomass yield by 46.80% and 51.11%, respectively, irrespective of the maize variety compared with the control. The mean damage score, biomass and grain yield of conventional push-pull and modified push-pull were not significantly different. The fall armyworm infestation was decreased by 14.61% in the major season compared with the minor cropping season. This study provides novel evidence of the effectiveness of push-pull farming practice in reducing fall armyworm infestation and damage, and in increasing maize yield in Ghana, which has a different ecosystem to East Africa, where push-pull was developed. Further, it provides critical evidence of the effectiveness of a spatial modification of the push crop in relation with the main crop against the fall armyworm.

ACS Style

Stephen Yeboah; Stella A. Ennin; Adama Ibrahim; Patricia Oteng-Darko; Daniel Mutyambai; Zeyaur R. Khan; Moses B. Mochiah; Sunday Ekesi; Saliou Niassy. Effect of spatial arrangement of push-pull companion plants on fall armyworm control and agronomic performance of two maize varieties in Ghana. Crop Protection 2021, 145, 105612 .

AMA Style

Stephen Yeboah, Stella A. Ennin, Adama Ibrahim, Patricia Oteng-Darko, Daniel Mutyambai, Zeyaur R. Khan, Moses B. Mochiah, Sunday Ekesi, Saliou Niassy. Effect of spatial arrangement of push-pull companion plants on fall armyworm control and agronomic performance of two maize varieties in Ghana. Crop Protection. 2021; 145 ():105612.

Chicago/Turabian Style

Stephen Yeboah; Stella A. Ennin; Adama Ibrahim; Patricia Oteng-Darko; Daniel Mutyambai; Zeyaur R. Khan; Moses B. Mochiah; Sunday Ekesi; Saliou Niassy. 2021. "Effect of spatial arrangement of push-pull companion plants on fall armyworm control and agronomic performance of two maize varieties in Ghana." Crop Protection 145, no. : 105612.

Preprint content
Published: 22 February 2021
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This study was conducted to investigate the effect of biochar, straw and N fertilizer on soil properties, soil respiration and grain yield of spring wheat (Triticum aestivum L.) in semi-arid Western Loess Plateau of northwestern China. The two carbon sources (straw and biochar) were applied alone or combined with nitrogen fertilizer (urea, 46% nitrogen [N]), whilst the soil without carbon is made up of nitrogen fertilizer applied at 0, 50 and 100 kg N/ha. The experiment was arranged in a randomized complete block design with three replicates and was conducted in 2014, 2015 and 2016 cropping season. Results showed that the greatest grain yields were found with 100 kg N ha−1 fertilization rate under biochar, straw and soils without carbon, but the greatest effect occurred on the biochar amended soils. Biochar amendment produced the greatest grain yield at 1906 kg ha−1, followed by straw treated soils at 1643 kg ha−1, and soils without carbon the lowest at 1553 kg ha−1. This results is supported by the fact that, biochar amended soils (at 0–10 cm) increased soil organic C by 17.14% and 21.65% compared to straw treated soils and soils without carbon respectively. Seasonal soil respirations were between 19.05% and 23.67% lower in BN100 compared with SN50 and CN100. Soil respiration reduced with increasing N fertilization rates under all treatments, but the greatest effect occurred on biochar plots. Biochar amended soils decreased carbon emission by 26.80% and 9.54% compared to straw treated soils and soils without carbon amendment respectively. Increased grain yield and the decreased carbon emission in BN100 translated into greater carbon emission efficiency (2.88 kg kg−1) which was significantly different compared with the other treatments. Combined application of biochar with 100 kg N ha−1 in rainfed spring wheat was a suitable agricultural practice.

ACS Style

Stephen Yeboah; Wu Jun; Cai Liqun; Patricia Oteng-Darko; Zhang Renzhi. Combined application of biochar with nitrogen fertilizer improves soil quality and reduces soil respiration whilst sustaining wheat grain yield in a semiarid environment. 2021, 1 .

AMA Style

Stephen Yeboah, Wu Jun, Cai Liqun, Patricia Oteng-Darko, Zhang Renzhi. Combined application of biochar with nitrogen fertilizer improves soil quality and reduces soil respiration whilst sustaining wheat grain yield in a semiarid environment. . 2021; ():1.

Chicago/Turabian Style

Stephen Yeboah; Wu Jun; Cai Liqun; Patricia Oteng-Darko; Zhang Renzhi. 2021. "Combined application of biochar with nitrogen fertilizer improves soil quality and reduces soil respiration whilst sustaining wheat grain yield in a semiarid environment." , no. : 1.

Journal article
Published: 22 September 2020 in Agriculture
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Modelling and multiple linear regression were used to explore the reason for low maize yield in the Atebubu-Amantin and West Mamprusi Districts of Ghana, West Africa. The study evaluated maize yields on twenty farms against measures of soil fertility, agronomic attributes and soil water availability. Correlations between yield, soil fertility, rain, crop density, and weed biomass, were low, and no single factor could explain the low yields. A 50-year virtual experiment was then set up using the Agricultural Production Systems Simulator (APSIM) to explore the interactions between climate, crop management (sowing date and nitrogen fertilization) and rooting depth on grain yield and nitrate (NO3-N) dynamics. The analysis showed that a lack of optimal sowing dates that synchronize radiation, rainfall events and nitrogen (N) management with critical growth stages explained the low farm yields.

ACS Style

Eric Danquah; Yacob Beletse; Richard Stirzaker; Christopher Smith; Stephen Yeboah; Patricia Oteng-Darko; Felix Frimpong; Stella Ennin. Monitoring and Modelling Analysis of Maize (Zea mays L.) Yield Gap in Smallholder Farming in Ghana. Agriculture 2020, 10, 420 .

AMA Style

Eric Danquah, Yacob Beletse, Richard Stirzaker, Christopher Smith, Stephen Yeboah, Patricia Oteng-Darko, Felix Frimpong, Stella Ennin. Monitoring and Modelling Analysis of Maize (Zea mays L.) Yield Gap in Smallholder Farming in Ghana. Agriculture. 2020; 10 (9):420.

Chicago/Turabian Style

Eric Danquah; Yacob Beletse; Richard Stirzaker; Christopher Smith; Stephen Yeboah; Patricia Oteng-Darko; Felix Frimpong; Stella Ennin. 2020. "Monitoring and Modelling Analysis of Maize (Zea mays L.) Yield Gap in Smallholder Farming in Ghana." Agriculture 10, no. 9: 420.

Book chapter
Published: 22 July 2020 in Applications of Biochar for Environmental Safety
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Agroecosystems have become very important not only for their role in achieving food security but also in mitigation of greenhouse gas emissions. This agro-ecological function has become very important since society expects agriculture to be more sustainable, by decreasing fertilizer inputs while reducing greenhouse gas emission. Mitigation measures to reduce net GHG emissions include increasing soil C sequestration by reduced tillage, biochar and straw application, and increased crop-use efficiency of fertilizer-N. An adequate management of soils and crops could result in a reduction of GHG emissions through complex interactive factors. However, which factors are mainly responsible for the differences in emissions across soil and environment type remain unclear and the mechanism underlying GHG emissions are complex. It is therefore imperative to determine how biochar could mitigate greenhouse gas emissions without adverse effect on crop yield. This chapter will predominantly review biochar application for improved resource use and reduce greenhouse gas emission in sub-Saharan Africa, except in some cases where specific mechanisms have been elucidated in other regions. We consider future perspectives on whether biochar application offers economic opportunities for smallholder farmers in developing countries, with a particular focus on Ghana. These issues provided the motivation for this chapter.

ACS Style

Stephen Yeboah; Patricia Oteng-Darko; Joseph Adomako; Abdul Rauf Alhassan Malimanga. Biochar Application for Improved Resource Use and Environmental Quality. Applications of Biochar for Environmental Safety 2020, 1 .

AMA Style

Stephen Yeboah, Patricia Oteng-Darko, Joseph Adomako, Abdul Rauf Alhassan Malimanga. Biochar Application for Improved Resource Use and Environmental Quality. Applications of Biochar for Environmental Safety. 2020; ():1.

Chicago/Turabian Style

Stephen Yeboah; Patricia Oteng-Darko; Joseph Adomako; Abdul Rauf Alhassan Malimanga. 2020. "Biochar Application for Improved Resource Use and Environmental Quality." Applications of Biochar for Environmental Safety , no. : 1.

Journal article
Published: 27 June 2019 in Journal of Agricultural Science
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The study sought to examine adoption of nutritious drought tolerant (DT) maize using social science research methods and participatory demonstration trials. The social science study used mixed method approach which combined both qualitative and quantitative methods. A split-plot demonstration trial of three improved maize varieties and a local variety, and two levels of Nitrogen fertilizer were established. The two fertilizer levels were low N [LN] (30 kg N ha-1) and high N [HN] (90 kg N ha-1). The results of the social science study showed 85% of men consider early maturity, grain quality and storability in adopting DT maize. Results also revealed that beside earliness and higher yield, taste and easy to harvest influenced women farmer’s choice for DT maize varieties. Climatic endurance, increased yield and grain quality showed a positive and statistically significant relationship with adoption of DT maize. On average, HN fertilization increased DT maize grain yields by 41% compared to the LN fertilization. The improved DT maize varieties had yield advantages ranging from 25 to 43% over the local variety. From this, DT maize appears to have a potential for its use with N-fertilizer in the fight against food insecurity with improved adoption and utilization in Ghana.

ACS Style

Stephen Yeboah; Natson Eyram Amengor; Patricia Oteng-Darko; Priscilla Francisco Ribeiro. Determinants of Nutritious Drought Tolerant Maize Adoption and Mineral Fertilizer Application Under Smallholder Farm Conditions in Ghana. Journal of Agricultural Science 2019, 11, p121 .

AMA Style

Stephen Yeboah, Natson Eyram Amengor, Patricia Oteng-Darko, Priscilla Francisco Ribeiro. Determinants of Nutritious Drought Tolerant Maize Adoption and Mineral Fertilizer Application Under Smallholder Farm Conditions in Ghana. Journal of Agricultural Science. 2019; 11 (10):p121.

Chicago/Turabian Style

Stephen Yeboah; Natson Eyram Amengor; Patricia Oteng-Darko; Priscilla Francisco Ribeiro. 2019. "Determinants of Nutritious Drought Tolerant Maize Adoption and Mineral Fertilizer Application Under Smallholder Farm Conditions in Ghana." Journal of Agricultural Science 11, no. 10: p121.

Journal article
Published: 16 May 2018 in Agronomy
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In rainfed agricultural ecosystems in northwest China, improving soil fertility and reducing greenhouse gas (GHG) emissions are key factors for developing sustainable agriculture. This study determined the short-term effects of different biochar amendment rates on diurnal and seasonal variations of GHG emissions in the Loess Plateau to produce a background dataset that may be used to inform nutrient management guidelines for semiarid environments. Biochar produced by pyrolysis at 300–500 °C from maize straw was applied at rates of 0, 10, 20, 30, 40, and 50 t ha−1 (T0, T1, T2, T3, T4, T5), respectively. The results indicated that in the first year after the application, T3, T4, and T5 treatments increased soil organic carbon (0–10 cm) by 54.7%, 56.3%, and 56.9% compared to the other treatments. In the first, year, biochar amendment decreased diurnal CH4 and N2O flux by an average of 17–119% compared to T0, among which T3 had the lowest mean value. T3 and T4 also had similar mean CO2 flux, which was 33% lower than T0. Application of 30 t ha−1 biochar produced the lowest cumulative CO2 and N2O emissions of 2300 and 4.07 kg h−1, respectively. Biochar amendment showed no effect on grain yiel but reduced the global warming potential and GHG emission intensity by an average of 23% and 25%, respectively. The biochar application rate of 30 t ha−1 under the conditions of this study may be an appropriate rate for improving soil C sequestration and mitigation of GHG emissions in the first year after its application to soils on semi–arid Loess Plateau.

ACS Style

Stephen Yeboah; Shirley Lamptey; Liqun Cai; Min Song. Short-Term Effects of Biochar Amendment on Greenhouse Gas Emissions from Rainfed Agricultural Soils of the Semi–Arid Loess Plateau Region. Agronomy 2018, 8, 74 .

AMA Style

Stephen Yeboah, Shirley Lamptey, Liqun Cai, Min Song. Short-Term Effects of Biochar Amendment on Greenhouse Gas Emissions from Rainfed Agricultural Soils of the Semi–Arid Loess Plateau Region. Agronomy. 2018; 8 (5):74.

Chicago/Turabian Style

Stephen Yeboah; Shirley Lamptey; Liqun Cai; Min Song. 2018. "Short-Term Effects of Biochar Amendment on Greenhouse Gas Emissions from Rainfed Agricultural Soils of the Semi–Arid Loess Plateau Region." Agronomy 8, no. 5: 74.

Journal article
Published: 28 March 2018 in Asian Journal of Research in Agriculture and Forestry
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ACS Style

Shirley Lamptey; Stephen Yeboah; Lingling Li. Response of Maize Forage Yield and Quality to Nitrogen Fertilization and Harvest Time in Semi−arid Northwest China. Asian Journal of Research in Agriculture and Forestry 2018, 1, 1 -10.

AMA Style

Shirley Lamptey, Stephen Yeboah, Lingling Li. Response of Maize Forage Yield and Quality to Nitrogen Fertilization and Harvest Time in Semi−arid Northwest China. Asian Journal of Research in Agriculture and Forestry. 2018; 1 (2):1-10.

Chicago/Turabian Style

Shirley Lamptey; Stephen Yeboah; Lingling Li. 2018. "Response of Maize Forage Yield and Quality to Nitrogen Fertilization and Harvest Time in Semi−arid Northwest China." Asian Journal of Research in Agriculture and Forestry 1, no. 2: 1-10.

Journal article
Published: 27 June 2017 in Crop Science
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Agriculture in rainfed dry areas is often challenged by inadequate water and nutrient supplies. Responses to these challenges include adequate fertilization, but it is unknown whether different nitrogen (N) rates from that commonly used in the Loess Plateau can alleviate this issue. Field experiments were conducted over three cropping seasons to investigate the effect of different N fertilization levels on soil water dynamics, photosynthetic activity, and grain yield of maize (Zea mays L.) grown in the Western Loess Plateau of China. Fertilizer was applied at planting at rates between 0 and 300 kg N ha−1 at regular increments of 100 kg N ha−1 (referred to as N0 and N300, respectively), and treatments were arranged in a complete randomized block design. Results showed that water use efficiency in the N200 and N300 treatments was ∼60% higher than N0 and N100 (P < 0.05), which translated into increased crop biomass and therefore grain yield (≈70–80%). These observations were consistent with all measurements of photosynthetic traits and suggested that, under the conditions of this study, the ecophysiological response of the crop may be optimized at N application rates in the range of 200 to 300 kg ha−1, depending on soil water availability. Agronomic efficiency calculations at this level of N fertilization reported consistently higher values and consequently suggested that environmental losses of applied fertilizer N were small. The current experimental results for the N application rates in the range of 200 to 300 kg ha−1 could be useful for improving N fertilizer and soil water management practices of maize production while maintaining a relatively stable yield level in rainfed dry areas. Future work should focus on optimizing timing and improving the placement of fertilizer N applied to maize. Copyright © 2017. . Copyright © by the Crop Science Society of America, Inc.

ACS Style

Shirley Lamptey; Lingling Li; Junhong Xie; Renzhi Zhang; Stephen Yeboah; Diogenes L. Antille. Photosynthetic Response of Maize to Nitrogen Fertilization in the Semiarid Western Loess Plateau of China. Crop Science 2017, 57, 2739 -2752.

AMA Style

Shirley Lamptey, Lingling Li, Junhong Xie, Renzhi Zhang, Stephen Yeboah, Diogenes L. Antille. Photosynthetic Response of Maize to Nitrogen Fertilization in the Semiarid Western Loess Plateau of China. Crop Science. 2017; 57 (5):2739-2752.

Chicago/Turabian Style

Shirley Lamptey; Lingling Li; Junhong Xie; Renzhi Zhang; Stephen Yeboah; Diogenes L. Antille. 2017. "Photosynthetic Response of Maize to Nitrogen Fertilization in the Semiarid Western Loess Plateau of China." Crop Science 57, no. 5: 2739-2752.

Journal article
Published: 15 May 2017 in Journal of Agricultural Science
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The objective of this study was to evaluate the effect of conventional tillage with straw removed (T), no tillage with straw removed (NT), no tillage with straw retained on the soil surface (NTS) and conventional tillage with straw incorporated (TS) on soil moisture, root growth and straw yield under rain-fed conditions. Findings of this research show that NTS and to a lesser extent, TS decreased soil bulk density in the 0-10 cm soil depth by approximately 3.35% and 2.75% compared to T and NT in spring wheat and field pea plots respectively. No tillage with straw retained (NTS) had greater soil moisture content (0-30 cm) at jointing, anthesis and milking stages compared with NT and T treatments with average 18.57% and 29.67% increase (P < 0.05) in spring wheat and field pea respectively. Compared with T and NT, root length, root surface area, root diameter and root volume at 0-50 cm soil depth under straw treated soils, especially with no tillage were significantly increased. Root length, surface area and root diameter in the 0-80 cm differed among the treatments in the order of NTS > TS > NT > T at all the sampling stages in both crops. No tillage with straw retention had the greatest straw yield of 4897 kg ha-1 in spring wheat and 2759 kg ha-1 in field pea, representing a significant increase of 20.61% and 22.74% compared to NT and T respectively. These results suggest that NTS could enhance spring wheat and field pea yield and water uptake via stimulating root growth, and therefore a practical way to improve crop productivity.

ACS Style

Stephen Yeboah; Shirley Lamptey; Renzhi Zhang; Lingling Li. Conservation Tillage Practices Optimizes Root Distribution and Straw Yield of Spring Wheat and Field Pea in Dry Areas. Journal of Agricultural Science 2017, 9, 37 .

AMA Style

Stephen Yeboah, Shirley Lamptey, Renzhi Zhang, Lingling Li. Conservation Tillage Practices Optimizes Root Distribution and Straw Yield of Spring Wheat and Field Pea in Dry Areas. Journal of Agricultural Science. 2017; 9 (6):37.

Chicago/Turabian Style

Stephen Yeboah; Shirley Lamptey; Renzhi Zhang; Lingling Li. 2017. "Conservation Tillage Practices Optimizes Root Distribution and Straw Yield of Spring Wheat and Field Pea in Dry Areas." Journal of Agricultural Science 9, no. 6: 37.

Original research article
Published: 10 May 2017 in Frontiers in Microbiology
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Knowledge about fungi diversity following different planting patterns could improve our understanding of soil processes and thus help us to develop sustainable management strategies. The objective of this study was to determine the impact of different furrow-ridge mulching techniques on fungal diversity in rhizosphere soil under continuous cropping system. The investigated treatments were: flat plot without mulch (CK); flat plot with mulch (T1); on-ridge planting with full mulch (T2); on-furrow planting with full mulch (T3); on-ridge planting with half mulch (T4); and on-furrow planting with half mulch (T5). NGS (Illumina) methods and ITS1 sequences were used in monitoring fungi diversity of the potato rhizosphere soil. The fungi diversity in the rhizosphere soil was ranked in the order T5>T2>T4>T1>CK at the early growth stage and T2>T3>T1>T4>CK at the late growth stage of potato. The fungal communities found in the rhizosphere soil were Ascomycota, Zygomycota, Basidiomycota, Chytridiomycota and other unidentified fungal communities. Among the fungal community in the rhizosphere soil, Ascomycota was found to be dominant fungi population, with the highest percentage (89%) in the T5 soil whereas the T2 soils had the lowest percentage (67%). The Fusarium abundance in fully mulched treated soils was higher than in half mulched treated soil. The dominant genus in the T4 soil was Mortierella, whereas lower populations (1-2%) of Scutellinia, Cryphonectria, Acremonium and Alternaria were found in that treatment. Among the eumycetes, the dominant fungal class in all treated soils was the Sordariomycetes, which ranged from 57% to 85% in T2 and T5 soils, respectively. The Fusarium percentages in half mulched treated soils (T4, T5) were 55% and 28% lower than that of complete mulched treated soils (T2, T3), respectively. The cluster analysis results showed that, CK, T4 and T5 treated soils and T1, T2 and T3 treated soils had similarities in microbial compositions, respectively. Potato tuber yield was greater under the on-ridge planting with full mulch (T2) treated soil, followed by on-ridge planting with half mulch (T4) treated soil. The rhizosphere soil under the on-ridge planting with full mulch (T2) soil had the highest fungal diversity, suggesting that this management was the best environment

ACS Style

Shuhao Qin; Stephen Yeboah; Xuexue Xu; Yuhui Liu; Bin Yu. Analysis on Fungal Diversity in Rhizosphere Soil of Continuous Cropping Potato Subjected to Different Furrow-Ridge Mulching Managements. Frontiers in Microbiology 2017, 8, 845 .

AMA Style

Shuhao Qin, Stephen Yeboah, Xuexue Xu, Yuhui Liu, Bin Yu. Analysis on Fungal Diversity in Rhizosphere Soil of Continuous Cropping Potato Subjected to Different Furrow-Ridge Mulching Managements. Frontiers in Microbiology. 2017; 8 ():845.

Chicago/Turabian Style

Shuhao Qin; Stephen Yeboah; Xuexue Xu; Yuhui Liu; Bin Yu. 2017. "Analysis on Fungal Diversity in Rhizosphere Soil of Continuous Cropping Potato Subjected to Different Furrow-Ridge Mulching Managements." Frontiers in Microbiology 8, no. : 845.

Research article
Published: 02 May 2017 in PLOS ONE
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This study was conducted to explore the changes in soil microbial populations, enzyme activity, and tuber yield under the rotation sequences of Potato–Common vetch (P–C), Potato–Black medic (P–B) and Potato–Longdong alfalfa (P–L) in a semi–arid area of China. The study also determined the effects of continuous potato cropping (without legumes) on the above mentioned soil properties and yield. The number of bacteria increased significantly (p < 0.05) under P–B rotation by 78%, 85% and 83% in the 2, 4 and 7–year continuous cropping soils, respectively compared to P–C rotation. The highest fungi/bacteria ratio was found in P–C (0.218), followed by P–L (0.184) and then P–B (0.137) rotation over the different cropping years. In the continuous potato cropping soils, the greatest fungi/bacteria ratio was recorded in the 4–year (0.4067) and 7–year (0.4238) cropping soils and these were significantly higher than 1–year (0.3041), 2–year (0.2545) and 3–year (0.3030) cropping soils. Generally, actinomycetes numbers followed the trend P–L>P–C>P–B. The P–L rotation increased aerobic azotobacters in 2–year (by 26% and 18%) and 4–year (40% and 21%) continuous cropping soils compared to P–C and P–B rotation, respectively. Generally, the highest urease and alkaline phosphate activity, respectively, were observed in P–C (55.77 mg g–1) and (27.71 mg g–1), followed by P–B (50.72 mg mg–1) and (25.64 mg g–1) and then P–L (41.61 mg g–1) and (23.26 mg g–1) rotation. Soil urease, alkaline phosphatase and hydrogen peroxidase activities decreased with increasing years of continuous potato cropping. On average, the P–B rotation significantly increased (p <0.05) tuber yield by 19% and 18%, compared to P–C and P–L rotation respectively. P–L rotation also increased potato tuber yield compared to P–C, but the effect was lesser relative to P–B rotation. These results suggest that adopting potato–legume rotation system has the potential to improve soil biology environment, alleviate continuous cropping obstacle and increase potato tuber yield in semi–arid region.

ACS Style

Shuhao Qin; Stephen Yeboah; Li Cao; Junlian Zhang; Shangli Shi; Yuhui Liu. Breaking continuous potato cropping with legumes improves soil microbial communities, enzyme activities and tuber yield. PLOS ONE 2017, 12, e0175934 .

AMA Style

Shuhao Qin, Stephen Yeboah, Li Cao, Junlian Zhang, Shangli Shi, Yuhui Liu. Breaking continuous potato cropping with legumes improves soil microbial communities, enzyme activities and tuber yield. PLOS ONE. 2017; 12 (5):e0175934.

Chicago/Turabian Style

Shuhao Qin; Stephen Yeboah; Li Cao; Junlian Zhang; Shangli Shi; Yuhui Liu. 2017. "Breaking continuous potato cropping with legumes improves soil microbial communities, enzyme activities and tuber yield." PLOS ONE 12, no. 5: e0175934.

Journal article
Published: 15 December 2016 in Journal of Agronomy
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ACS Style

Stephen Yeboah; Shirley Lamptey; Renzhi Zhang; Lingling Li. Spring Wheat-field Pea Rotation with Tillage Systems and Straw Retention Improves Soil Water Utilization and Reduces Carbon Emission. Journal of Agronomy 2016, 16, 32 -39.

AMA Style

Stephen Yeboah, Shirley Lamptey, Renzhi Zhang, Lingling Li. Spring Wheat-field Pea Rotation with Tillage Systems and Straw Retention Improves Soil Water Utilization and Reduces Carbon Emission. Journal of Agronomy. 2016; 16 (1):32-39.

Chicago/Turabian Style

Stephen Yeboah; Shirley Lamptey; Renzhi Zhang; Lingling Li. 2016. "Spring Wheat-field Pea Rotation with Tillage Systems and Straw Retention Improves Soil Water Utilization and Reduces Carbon Emission." Journal of Agronomy 16, no. 1: 32-39.

Original paper
Published: 07 November 2016 in Photosynthetica
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A field trial was conducted to determine the effect of nitrogen-enriched biochar on soil water content, plant’s photosynthetic parameters, and grain yield of spring wheat at the Dingxi Experimental Station during the 2014 and 2015 cropping seasons. Results showed that biochar applied with nitrogen fertilizer at a rate of 50 kg ha–1 of N (BN50) increased soil water content in the 0–30 cm depth range by approximately 40, 32, and 53% on average at anthesis, milking, and maturity, respectively, compared with zero-amendment (CN0). Stomatal conductance and net photosynthetic rate after the BN50 treatment increased by approximately 40 to 50% compared to CN0. Soil water content and photosynthetic traits also increased in other treatments using straw plus nitrogen fertilizer, but to lesser extent than that of BN50. Grain yields were highest (1905 and 2133 kg ha–1 in 2014 and 2015, respectively) under BN50. From this, biochar appears to have a potential for its use with N-fertilizer as a cost-effective amendment for crop production in semiarid environments.

ACS Style

Stephen Yeboah; R. Zhang; L. Cai; L. Li; J. Xie; Z. Luo; J. Wu; Diogenes L. Antille. Soil water content and photosynthetic capacity of spring wheat as affected by soil application of nitrogen-enriched biochar in a semiarid environment. Photosynthetica 2016, 55, 532 -542.

AMA Style

Stephen Yeboah, R. Zhang, L. Cai, L. Li, J. Xie, Z. Luo, J. Wu, Diogenes L. Antille. Soil water content and photosynthetic capacity of spring wheat as affected by soil application of nitrogen-enriched biochar in a semiarid environment. Photosynthetica. 2016; 55 (3):532-542.

Chicago/Turabian Style

Stephen Yeboah; R. Zhang; L. Cai; L. Li; J. Xie; Z. Luo; J. Wu; Diogenes L. Antille. 2016. "Soil water content and photosynthetic capacity of spring wheat as affected by soil application of nitrogen-enriched biochar in a semiarid environment." Photosynthetica 55, no. 3: 532-542.

Original article
Published: 05 August 2016 in Nutrient Cycling in Agroecosystems
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Greenhouse gas emissions from agriculture production are predicted to increase as the world’s population and demand for food increases. This research assessed the influence of tillage systems on CO2, N2O and CH4 fluxes and soil properties in spring wheat–field pea sequence in a rain-fed semi-arid environment. The tillage practices included; conventional tillage with straw removed (T), no–till with straw removed (NT), no-till with straw retention on the soil surface (NTS) and conventional tillage with straw incorporated (TS). Greenhouse gas emissions were monitored during the 2013, 2014 and 2015 cropping seasons using a carbon dioxide analyzer and static chamber-gas chromatography. Although the results showed that all treatments served as sources of atmospheric CO2 and N2O, and a sink of atmospheric CH4, CO2 and N2O emissions significantly decreased by 21 and 34 % in NTS sites, and CH4 uptake increased by 22 % compared with T fields. Soil organic carbon (0–30 cm) increased by 24, 19 and 7 % in NTS compared to T, NT and TS respectively. In addition, the contribution to increase soil organic carbon was much higher under straw retention treatments. T plots significantly increased global warming potential by 37 and 30 % in N2O and CH4 versus NTS soils. NTS increased straw and grain yield compared with straw removal treatments (NT and T), but that had no effect compared with TS treatment. NTS farming practices demonstrated increases in crop productivity and reduced greenhouse gas under dryland cropping systems.

ACS Style

Stephen Yeboah; Renzhi Zhang; Liqun Cai; Min Song; Lingling Li; Junhong Xie; Zhuzhu Luo; Jun Wu; Jun Zhang. Greenhouse gas emissions in a spring wheat–field pea sequence under different tillage practices in semi-arid Northwest China. Nutrient Cycling in Agroecosystems 2016, 106, 77 -91.

AMA Style

Stephen Yeboah, Renzhi Zhang, Liqun Cai, Min Song, Lingling Li, Junhong Xie, Zhuzhu Luo, Jun Wu, Jun Zhang. Greenhouse gas emissions in a spring wheat–field pea sequence under different tillage practices in semi-arid Northwest China. Nutrient Cycling in Agroecosystems. 2016; 106 (1):77-91.

Chicago/Turabian Style

Stephen Yeboah; Renzhi Zhang; Liqun Cai; Min Song; Lingling Li; Junhong Xie; Zhuzhu Luo; Jun Wu; Jun Zhang. 2016. "Greenhouse gas emissions in a spring wheat–field pea sequence under different tillage practices in semi-arid Northwest China." Nutrient Cycling in Agroecosystems 106, no. 1: 77-91.

Journal article
Published: 12 February 2015 in Environmental Earth Sciences
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Recently, heavy metal pollution of Baiyin District has become more serious affecting the health of the people and threatening food security. This study was conducted in 2012 to determine the levels of contamination and pollution using geoaccumulation index and potential ecological risk index to evaluate pollution levels of arable layers. Both methods were used to evaluate the risk and determine the present situation of soil heavy metal [copper (Cu), zinc (Zn) and lead (Pb)] pollution characteristics in farmland. This will form the basis for the control of the soil heavy metal pollution, as well as for rational layout of the agricultural industry. Content and spatial distribution of the heavy metals recorded from 1,225 soil samples of arable layer in the study area had average concentration of Cu, Zn and Pb of 36.70, 122.20, and 33.80 mg/kg, respectively. The result shows fluctuating metal concentrations of the heavy metals with Cu, Zn and Pb recording 7.47, 11.07, and 14.46, which are higher than the environmental standard concentrations, respectively. The average pollution of the heavy metals in decreasing order was Pb > Zn > Cu with variation coefficient of 1.92, 2.00, and 2.92, respectively. Evaluation results of Geoaccumulation index show that Cu, Zn, and Pb pollutions of arable layer were mainly concentrated in urban areas, with pollution degree in the order of Pb, Zn, and Cu. Evaluation results of the potential ecological risk index show that the risk of Zn in arable layer is mild, and the risk of Cu and Pb in most of the arable land is also mild, except in surrounding areas of the city where the risk appears medium, and above medium, respectively.

ACS Style

Cai Li-Qun; Stephen Yeboah; Sun Cheng-Sheng; Cai Xiao-Dong; Zhang Ren-Zhi. GIS-based assessment of arable layer pollution of copper (Cu), zinc (Zn) and lead (Pb) in Baiyin District of Gansu Province. Environmental Earth Sciences 2015, 74, 803 -811.

AMA Style

Cai Li-Qun, Stephen Yeboah, Sun Cheng-Sheng, Cai Xiao-Dong, Zhang Ren-Zhi. GIS-based assessment of arable layer pollution of copper (Cu), zinc (Zn) and lead (Pb) in Baiyin District of Gansu Province. Environmental Earth Sciences. 2015; 74 (1):803-811.

Chicago/Turabian Style

Cai Li-Qun; Stephen Yeboah; Sun Cheng-Sheng; Cai Xiao-Dong; Zhang Ren-Zhi. 2015. "GIS-based assessment of arable layer pollution of copper (Cu), zinc (Zn) and lead (Pb) in Baiyin District of Gansu Province." Environmental Earth Sciences 74, no. 1: 803-811.

Journal article
Published: 15 November 2014 in Agricultural Science
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Influence of Planting Methods and Density on Performance of Chia (Salvia hispanica) and its Suitability as an Oilseed Plant

ACS Style

S. Yeboah; E. Owusu Danquah; J.N.L. Lamptey; M.B. Mochiah; S. Lamptey; Patricia Oteng-Darko; I. Adama; Z. Appiah-Kubi; K. Agyeman. Influence of Planting Methods and Density on Performance of Chia (Salvia hispanica) and its Suitability as an Oilseed Plant. Agricultural Science 2014, 2, 14 -26.

AMA Style

S. Yeboah, E. Owusu Danquah, J.N.L. Lamptey, M.B. Mochiah, S. Lamptey, Patricia Oteng-Darko, I. Adama, Z. Appiah-Kubi, K. Agyeman. Influence of Planting Methods and Density on Performance of Chia (Salvia hispanica) and its Suitability as an Oilseed Plant. Agricultural Science. 2014; 2 (4):14-26.

Chicago/Turabian Style

S. Yeboah; E. Owusu Danquah; J.N.L. Lamptey; M.B. Mochiah; S. Lamptey; Patricia Oteng-Darko; I. Adama; Z. Appiah-Kubi; K. Agyeman. 2014. "Influence of Planting Methods and Density on Performance of Chia (Salvia hispanica) and its Suitability as an Oilseed Plant." Agricultural Science 2, no. 4: 14-26.

Journal article
Published: 14 April 2014 in Journal of Agricultural Science
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S. Lamptey; B. D. K. Ahiabor; S. Yeboah; D. Osei. Effect of Rhizobium Inoculants and Reproductive Growth Stages on Shoot Biomass and Yield of Soybean (Glycine max (L.) Merril). Journal of Agricultural Science 2014, 6, 1 .

AMA Style

S. Lamptey, B. D. K. Ahiabor, S. Yeboah, D. Osei. Effect of Rhizobium Inoculants and Reproductive Growth Stages on Shoot Biomass and Yield of Soybean (Glycine max (L.) Merril). Journal of Agricultural Science. 2014; 6 (5):1.

Chicago/Turabian Style

S. Lamptey; B. D. K. Ahiabor; S. Yeboah; D. Osei. 2014. "Effect of Rhizobium Inoculants and Reproductive Growth Stages on Shoot Biomass and Yield of Soybean (Glycine max (L.) Merril)." Journal of Agricultural Science 6, no. 5: 1.

Journal article
Published: 10 January 2014 in American Journal of Experimental Agriculture
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B. D. K. Ahiabor; S. Lamptey; Stephen Yeboah; V. Bahari. Application of Phosphorus Fertilizer on Soybean [(Glycine max L. (Merril)] Inoculated with Rhizobium and its Economic Implication to Farmers. American Journal of Experimental Agriculture 2014, 4, 1420 -1434.

AMA Style

B. D. K. Ahiabor, S. Lamptey, Stephen Yeboah, V. Bahari. Application of Phosphorus Fertilizer on Soybean [(Glycine max L. (Merril)] Inoculated with Rhizobium and its Economic Implication to Farmers. American Journal of Experimental Agriculture. 2014; 4 (11):1420-1434.

Chicago/Turabian Style

B. D. K. Ahiabor; S. Lamptey; Stephen Yeboah; V. Bahari. 2014. "Application of Phosphorus Fertilizer on Soybean [(Glycine max L. (Merril)] Inoculated with Rhizobium and its Economic Implication to Farmers." American Journal of Experimental Agriculture 4, no. 11: 1420-1434.

Journal article
Published: 12 January 2012 in African Journal of Agricultural Research
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S Yeboah. Organic and inorganic fertilizers application on the growth and yield of Artemisia annua L. in the humid tropics of Ghana. African Journal of Agricultural Research 2012, 7, 1 .

AMA Style

S Yeboah. Organic and inorganic fertilizers application on the growth and yield of Artemisia annua L. in the humid tropics of Ghana. African Journal of Agricultural Research. 2012; 7 (2):1.

Chicago/Turabian Style

S Yeboah. 2012. "Organic and inorganic fertilizers application on the growth and yield of Artemisia annua L. in the humid tropics of Ghana." African Journal of Agricultural Research 7, no. 2: 1.

Journal article
Published: 15 December 2011 in Journal of Plant Breeding and Crop Science
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S. Yeboah. Agronomic performance of five varieties of annual wormwood (Artemisia annua L.) in the humid tropics of Ghana. Journal of Plant Breeding and Crop Science 2011, 3, 1 .

AMA Style

S. Yeboah. Agronomic performance of five varieties of annual wormwood (Artemisia annua L.) in the humid tropics of Ghana. Journal of Plant Breeding and Crop Science. 2011; 3 (16):1.

Chicago/Turabian Style

S. Yeboah. 2011. "Agronomic performance of five varieties of annual wormwood (Artemisia annua L.) in the humid tropics of Ghana." Journal of Plant Breeding and Crop Science 3, no. 16: 1.