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A/Prof Chris Guppy has supervised 16 PhD, and more than 40 Honours and Masters students to completion over the last 16 years. Although formally an expert in soil fertility has also recently supervised and published research in farming systems and producer-led change in Myanmar and Cambodia and supervised students through both projects. Has 6+ years experience in survey design for small-holders and publication of results in respected journals concerning climate-based and farming system productivity changes.
Christopher Guppy. Is soil phosphorus fractionation as valuable as we think? Plant and Soil 2021, 459, 19 -21.
AMA StyleChristopher Guppy. Is soil phosphorus fractionation as valuable as we think? Plant and Soil. 2021; 459 (1-2):19-21.
Chicago/Turabian StyleChristopher Guppy. 2021. "Is soil phosphorus fractionation as valuable as we think?" Plant and Soil 459, no. 1-2: 19-21.
Landscape scale assessment of temporal variations in soil organic carbon (SOC) contents and soil pH and the implications for long-term agricultural sustainability was determined using legacy datasets collected over two periods separated by 20 years: the 1990s and 2010s. Soil data on SOC and pH were categorized according to the prevailing land types (based on inundation as highland (HL), medium highland (MHL), and medium lowland (MLL)), and physiographic types (i.e., Himalayan Piedmont plain, Tista Floodplain and Barind tract/Terrace) to determine which variable or combination of variables was more influential in spatial and temporal changes of these properties. SOC contents in the physiographic types were generally found to be low, varying between 8 to 12 g/kg. While, SOC contents were significantly higher in MHL and MLL compared with HL that experienced less inundation. The change in SOC contents over 20 years was significant with a 14.5% increase of SOC. There was a greater influence of land type compared with physiography on SOC contents over time. Inundation land types and associated cropping intensity were considered likely to influence SOC of soils under rice-based cropping systems. Furthermore, the levels of soil pH decreased by 0.5 units over 20 years with an approximately 50% increase in soils within a pH category of 4.6–5.5. The majority of soil pH results shift from slightly acidic to strongly acidic in the intervening 20-year period between samplings. Soil acidification is potentially a combination of inefficient and excess use of ammonium-based fertilizers with higher application rates and low input from residues. We conclude that acidification may continue with more intensive land use. However, trends in SOC contents over time under certain combinations of physiography and land type either increased slightly or showed a significant loss and in the latter, specifically, the role of land management is not clear. The legacy datasets would be useful for monitoring spatial and temporal soil quality trends at a regional scale, but has limited capacity to capture field level variations in soil properties as data on smallholder cropping practice and management were not collected. Therefore, future research examining the role of management in SOC and pH dynamics at the field-scale would guide the use of fertilizers, crop residue management, and amelioration of acidic soil, to improve the sustainability of rice-based cropping systems in Bangladesh.
Noor E. Alam Siddique; Lisa Lobry De Bruyn; Chris N. Guppy; Yui Osanai. Temporal Variations of Soil Organic Carbon and pH at Landscape Scale and the Implications for Cropping Intensity in Rice-Based Cropping Systems. Agronomy 2020, 11, 59 .
AMA StyleNoor E. Alam Siddique, Lisa Lobry De Bruyn, Chris N. Guppy, Yui Osanai. Temporal Variations of Soil Organic Carbon and pH at Landscape Scale and the Implications for Cropping Intensity in Rice-Based Cropping Systems. Agronomy. 2020; 11 (1):59.
Chicago/Turabian StyleNoor E. Alam Siddique; Lisa Lobry De Bruyn; Chris N. Guppy; Yui Osanai. 2020. "Temporal Variations of Soil Organic Carbon and pH at Landscape Scale and the Implications for Cropping Intensity in Rice-Based Cropping Systems." Agronomy 11, no. 1: 59.
Steel slags can be used in agriculture, as they are composed of CaO, MgO, SiO2, and compounds such as P2O5, FeO, and MnO. The solubility of slag may be higher than that of lime, which can make this residue an excellent source for soil acidity correction in no-till systems. However, there are few studies reporting their benefits when applied to the soil surface. This study evaluated slag amendment effects on soil chemical attributes and on the yield and nutrient uptake of soybean following surface application and/or incorporation of different types of slag, in comparison to lime, on a tropical, acidic soil under a no-till system. The trial was performed in Botucatu, SP, Brazil. Six soil-acidity corrective materials were incorporated or surface-applied, including steel slag, ladle slag, stainless-steel slag, wollastonite, dolomitic lime, and calcined dolomitic lime, plus a negative control. Each material dose was calculated to raise the base saturation to 70%. Slags can be applied in a no-tillage system with efficiency similar to that of lime for the neutralization of soil acidity, for adequate nutrition and yield of the soybean crop. Slags and limes showed similar effects on increased pH, decreased Al3+concentration, and increased base saturation up to the 0.40 and 0.20-m soil layers at 12 and 23 months, respectively, after the application of treatments, regardless of surface or incorporated application. The by-product application has an additional advantage, depending on the type of slag, that is the provision of phosphorus and/or silicon.
Angélica Cristina Fernandes Deus; Leonardo Theodoro Büll; Christopher N. Guppy; Susiane De Moura Cardoso Santos; Laís Lorena Queiroz Moreira. Effects of lime and steel slag application on soil fertility and soybean yield under a no till-system. Soil and Tillage Research 2019, 196, 104422 .
AMA StyleAngélica Cristina Fernandes Deus, Leonardo Theodoro Büll, Christopher N. Guppy, Susiane De Moura Cardoso Santos, Laís Lorena Queiroz Moreira. Effects of lime and steel slag application on soil fertility and soybean yield under a no till-system. Soil and Tillage Research. 2019; 196 ():104422.
Chicago/Turabian StyleAngélica Cristina Fernandes Deus; Leonardo Theodoro Büll; Christopher N. Guppy; Susiane De Moura Cardoso Santos; Laís Lorena Queiroz Moreira. 2019. "Effects of lime and steel slag application on soil fertility and soybean yield under a no till-system." Soil and Tillage Research 196, no. : 104422.
The mechanisms controlling the genesis of rhizosheaths are not well understood, despite their importance in controlling the flux of nutrients and water from soil to root. Here, we examine the development of rhizosheaths from drought‐tolerant and drought‐sensitive chickpea varieties; focusing on the three‐dimensional characterization of the pore volume (> 16 μm voxel spatial resolution) obtained from X‐ray microtomography, along with the characterization of mucilage and root hairs, and water sorption. We observe that drought‐tolerant plants generate a larger diameter root, and a greater and more porous mass of rhizosheath, which also has a significantly increased water sorptivity, as compared with bulk soil. Using lattice Boltzmann simulations of soil permeability, we find that the root activity of both cultivars creates an anisotropic structure in the rhizosphere, in that its ability to conduct water in the radial direction is significantly higher than in the axial direction, especially in the drought‐tolerant cultivar. We suggest that significant differences in rhizosheath architectures are sourced not only by changes in structure of the volumes, but also from root mucilage, and further suggest that breeding for rhizosheath architectures and function may be a potential future avenue for better designing crops in a changing environment.
Sheikh M. F. Rabbi; Matthew Tighe; Richard Flavel; Brent Kaiser; Christopher Guppy; Xiaoxian Zhang; Iain M. Young. Plant roots redesign the rhizosphere to alter the three-dimensional physical architecture and water dynamics. New Phytologist 2018, 219, 542 -550.
AMA StyleSheikh M. F. Rabbi, Matthew Tighe, Richard Flavel, Brent Kaiser, Christopher Guppy, Xiaoxian Zhang, Iain M. Young. Plant roots redesign the rhizosphere to alter the three-dimensional physical architecture and water dynamics. New Phytologist. 2018; 219 (2):542-550.
Chicago/Turabian StyleSheikh M. F. Rabbi; Matthew Tighe; Richard Flavel; Brent Kaiser; Christopher Guppy; Xiaoxian Zhang; Iain M. Young. 2018. "Plant roots redesign the rhizosphere to alter the three-dimensional physical architecture and water dynamics." New Phytologist 219, no. 2: 542-550.
Soil sodicity degrades land and more than half of the world’s sodic soils are in Australia. Farmers in Australia produce and export cotton grown in sodic soils. Undesirable physicochemical constraints (e.g. high pH, high bulk density, low porosity and reduced oxygen content) are associated with sodic soils and may adversely affect microbial interactions in the rhizosphere, including mycorrhizal associations. This viewpoint focusses on facts and gaps in our knowledge about mycorrhizal associations in sodic soils, with special attention to cotton systems. We highlight the difference between saline and sodic soil conditions and the impacts they may have on host plant-mycorrhizae symbiosis. This viewpoint identifies the need for more research on the potential impact of sodicity on mycorrhizal species diversity, functionality and benefits to crop growth. Changes in agronomic management strategies to maximize mycorrhizal symbiosis benefits are suggested, especially for those plant species, like cotton, that are highly reliant on mycorrhizal symbiosis for optimal growth and nutrient uptake.
Samieh Eskandari; Christopher N. Guppy; Oliver G.G. Knox; David Backhouse; Rebecca E. Haling. Understanding the impact of soil sodicity on mycorrhizal symbiosis: Some facts and gaps identified from cotton systems. Applied Soil Ecology 2018, 126, 199 -201.
AMA StyleSamieh Eskandari, Christopher N. Guppy, Oliver G.G. Knox, David Backhouse, Rebecca E. Haling. Understanding the impact of soil sodicity on mycorrhizal symbiosis: Some facts and gaps identified from cotton systems. Applied Soil Ecology. 2018; 126 ():199-201.
Chicago/Turabian StyleSamieh Eskandari; Christopher N. Guppy; Oliver G.G. Knox; David Backhouse; Rebecca E. Haling. 2018. "Understanding the impact of soil sodicity on mycorrhizal symbiosis: Some facts and gaps identified from cotton systems." Applied Soil Ecology 126, no. : 199-201.
The Central Dry Zone in Myanmar is a major production area of rainfed pulses and sesame, grown in double-crop systems or intercropped with pigeon pea. Yields are generally low and variable. Water balance modelling in the Magway Region was used to identify opportunities for improvement. Annual rainfall from 1951 to 2016 was 754 mm (CV = 0.22), with 668 mm (CV = 0.26) in the growing season of 180 days (CV = 0.15). Variable rainfall and low soil water holding capacity lead to wide inter- and intra-annual fluctuation between water deficit and excess, with nutrient leaching expected from substantial deep percolation (61 mm yr−1). Despite variable rainfall, monsoon crops of 80–90 days duration had relatively stable ET (CV = 0.09) suggesting reliable potential yields, estimated to average 2.9 t ha−1 for groundnut. Reliable yields should also be achievable when this crop is intercropped with long duration (180 days) pigeon pea, a system that ensures income from the intercrop whilst having the capacity to adapt to variable post-monsoon conditions. The challenge with monsoon crops and pigeon pea is to effectively provide soluble nutrients (N, S) in a leaching environment, and P when surface soil is frequently dry. The post-monsoon crop in a double-crop system is risky, with variable ET (CV = 0.37) and yield potential. An option here is to vary inputs according to the potential, which is high with early sowing on a wet soil profile. Rainfall has declined since the 1950's, notably in June-July, but with no discernible effect on planting date or growing season length. There are now fewer but larger rainfall events, with implications for hydrology, agronomy and soil conservation.
Peter S. Cornish; Craig Birchall; David Herridge; Matthew Denton; Christopher Guppy. Rainfall-related opportunities, risks and constraints to rainfed cropping in the Central Dry Zone of Myanmar as defined by soil water balance modelling. Agricultural Systems 2018, 164, 47 -57.
AMA StylePeter S. Cornish, Craig Birchall, David Herridge, Matthew Denton, Christopher Guppy. Rainfall-related opportunities, risks and constraints to rainfed cropping in the Central Dry Zone of Myanmar as defined by soil water balance modelling. Agricultural Systems. 2018; 164 ():47-57.
Chicago/Turabian StylePeter S. Cornish; Craig Birchall; David Herridge; Matthew Denton; Christopher Guppy. 2018. "Rainfall-related opportunities, risks and constraints to rainfed cropping in the Central Dry Zone of Myanmar as defined by soil water balance modelling." Agricultural Systems 164, no. : 47-57.
The provenance or origin of a soil sample is of interest in soil forensics, archaeology, and biosecurity. In all of these fields, highly specialized and often expensive analysis is usually combined with expert interpretation to estimate sample origin. In this proof of concept study we apply rapid and non-destructive spectral analysis to the question of direct soil provenancing. This approach is based on one of the underlying tenets of soil science – that soil pedogenesis is spatially unique, and thus digital spectral signatures of soil can be related directly, rather than via individual soil properties, to a georeferenced location. We examine three different multivariate regression techniques to predict GPS coordinates in two nested datasets. With a minimum of data processing, we show that in most instances Eastings and Northings can be predicted to within 20% of the range of each within the dataset using the spectral signatures produced via portable x-ray fluorescence. We also generate 50 and 95% confidence intervals of prediction and express these as a range of GPS coordinates. This approach has promise for future application in soil and environmental provenancing.
M. Tighe; N. Förster; C. Guppy; D. Savage; P. Grave; I. M. Young. Georeferenced soil provenancing with digital signatures. Scientific Reports 2018, 8, 1 -9.
AMA StyleM. Tighe, N. Förster, C. Guppy, D. Savage, P. Grave, I. M. Young. Georeferenced soil provenancing with digital signatures. Scientific Reports. 2018; 8 (1):1-9.
Chicago/Turabian StyleM. Tighe; N. Förster; C. Guppy; D. Savage; P. Grave; I. M. Young. 2018. "Georeferenced soil provenancing with digital signatures." Scientific Reports 8, no. 1: 1-9.
As single superphosphate availability decreases due to closure of aging manufacturing plants increasing attention is being paid to alternative phosphorus (P) and sulfur (S) sources. This glasshouse study, conducted under non-leaching conditions was undertaken to evaluate the S supplying capacity of gypsum, S bentonite, elemental S (ES) and a range of P containing fertilizers and those where ES was added as a coating or incorporated. The magnitude of crop response in terms of shoot biomass to applied S fertilizer sources followed the order of sulfates > powdered ES > coated/incorporated ES > S/bentonite. These results indicate that fertilizers containing a mixture of sulfate and micronized ES (<75 µm), either incorporated within the granule or coated onto the fertilizer are agronomically effective. The results also suggest that local S coating of finished fertilizers is a feasible alternative to S incorporation undertaken at a central fertilizer plant.
Watson Matamwa; Graeme Blair; Christopher Guppy; Isa Yunusa. Plant Availability of Sulfur Added to Finished Fertilizers. Communications in Soil Science and Plant Analysis 2018, 49, 433 -443.
AMA StyleWatson Matamwa, Graeme Blair, Christopher Guppy, Isa Yunusa. Plant Availability of Sulfur Added to Finished Fertilizers. Communications in Soil Science and Plant Analysis. 2018; 49 (4):433-443.
Chicago/Turabian StyleWatson Matamwa; Graeme Blair; Christopher Guppy; Isa Yunusa. 2018. "Plant Availability of Sulfur Added to Finished Fertilizers." Communications in Soil Science and Plant Analysis 49, no. 4: 433-443.
This study was undertaken to study the impact of adding <75 μm elemental sulfur (ES) on P availability from a range of <250 μm ground rock phosphates (RP) namely; Minjingu (Mi) from Tanzania, Khouribga from Morocco (Mo) and Duchess (D) from Australia. Italian ryegrass (Lolium multiflorum, Thumpa tetraploid) grown in a glasshouse was used as the test crop and tops were harvested 5 times over 27 weeks. Co-granulating RP and 10.7% ES yielded 30–70% more ryegrass tops than RP alone, with the greatest effect with Mi. Fertilizer P recovery in the tops from the RP was 5.2% with D and 6.5% and 7.8% from Mi and Mo, respectively. ES addition increased this by 51% from Mo, 98% from D and 194% from Mi. Co-granulation of RP with ES has been shown to be an effective means of releasing plant available P to crops from RP with minimal fertilizer processing.
Watson Matamwa; Christopher Guppy; Graeme Blair. In Situ Acidulation of Rock Phosphate. Communications in Soil Science and Plant Analysis 2018, 49, 426 -432.
AMA StyleWatson Matamwa, Christopher Guppy, Graeme Blair. In Situ Acidulation of Rock Phosphate. Communications in Soil Science and Plant Analysis. 2018; 49 (4):426-432.
Chicago/Turabian StyleWatson Matamwa; Christopher Guppy; Graeme Blair. 2018. "In Situ Acidulation of Rock Phosphate." Communications in Soil Science and Plant Analysis 49, no. 4: 426-432.
Integration of tropical forage legumes into cropping systems may improve subsequent crop nitrogen (N) supply, but removal of legume biomass for forage is likely to diminish these benefits. This study aimed to determine: (i) under irrigated conditions, the potential N inputs that can be provided by different tropical forage legumes to a subsequent cereal crop; and (ii) the residual N benefits once fodder had been removed. Available soil mineral N following tropical forage legumes lablab (Lablab purpureus), centro (Centrosema pascuorum), butterfly pea (Clitoria ternatea) and burgundy bean (Macroptilium bracteatum) and grain legume soybean (Glycine max) was compared with a maize (Zea mays) control when legume biomass was retained or cut and removed (phase 1). An oat (Avena sativa) cover crop was then grown to ensure consistent soil-water across treatments (phase 2), followed by a maize grain crop (phase 3) in which N uptake, biomass production and grain yield were compared among the phase 1 treatments. To determine N-fertiliser equivalence values for subsequent maize crop yields, different rates of fertiliser (0–150 kg urea-N/ha) were applied in phase 3. Retained biomass of butterfly pea, centro and lablab increased phase 3 unfertilised maize grain yield by 6–8 t/ha and N uptake by 95–200 kg N/ha compared with a previous cereal crop, contributing the equivalent of 100–150 kg urea-N/ha. When legume biomass was cut and removed, grain yield in the phase 3 maize crop did not increase significantly. When butterfly pea, centro and lablab biomass was retained rather than removed, the maize accumulated an additional 80–132 kg N/ha. After fodder removal, centro was the only legume that provided N benefits to the phase 3 maize crop (equivalent of 33 kg urea-N/ha). Burgundy bean did not increase subsequent crop production when biomass was either retained or removed. The study found that a range of tropical forage legumes could contribute large amounts of N to subsequent crops, potentially tripling maize grain yield. However, when these legumes were cut and removed, the benefits were greatly diminished and the legumes provided little residual N benefit to a subsequent crop. Given the large N trade-offs between retaining and removing legume biomass, quantification of N inputs under livestock grazing or when greater residual biomass is retained may provide an alternative to achieving dual soil N–fodder benefits.
Skye Traill; Lindsay W. Bell; Neal P. Dalgliesh; Ainsleigh Wilson; Lina-May Ramony; Chris Guppy. Tropical forage legumes provide large nitrogen benefits to maize except when fodder is removed. Crop and Pasture Science 2018, 69, 183 .
AMA StyleSkye Traill, Lindsay W. Bell, Neal P. Dalgliesh, Ainsleigh Wilson, Lina-May Ramony, Chris Guppy. Tropical forage legumes provide large nitrogen benefits to maize except when fodder is removed. Crop and Pasture Science. 2018; 69 (2):183.
Chicago/Turabian StyleSkye Traill; Lindsay W. Bell; Neal P. Dalgliesh; Ainsleigh Wilson; Lina-May Ramony; Chris Guppy. 2018. "Tropical forage legumes provide large nitrogen benefits to maize except when fodder is removed." Crop and Pasture Science 69, no. 2: 183.
The majority of terrestrial plants form some type of mycorrhizal symbiosis. This established symbiosis therefore exists in most commercially important crops, which includes cotton. Arbuscular mycorrhizal fungus (AMF) can colonise 50%–90% of cotton root length under field and controlled conditions. Mycorrhization improves growth and nutrient uptake (especially phosphorus) of cotton, particularly at the early growth stages. Mycorrhizal symbioses help plants to counter the stresses imposed by physical and chemical soil constraints; however, adverse environmental conditions may restrict the mycorrhizal associations and consequently may reduce nutrient uptake and impair plant growth. In Australia, cotton is mainly grown on sodic soils that contain more than 6% of the total cations as exchangeable sodium. High levels of sodium in the soil create adverse physical and chemical soil conditions that may negatively affect mycorrhizal symbioses of cotton. This review discusses the cotton mycorrhizal colonisation, plant growth, and disease protection effects, potential negative effects of physical and chemical properties of sodic soils, and influences of some agronomic management practices. In addition, the research gaps were identified and some practical applications of the research outcomes were suggested.
Samieh Eskandari; Christopher N. Guppy; Oliver G.G. Knox; David Backhouse; Rebecca E. Haling. Mycorrhizal Symbioses of Cotton Grown on Sodic Soils: A Review from an Australian Perspective. Pedosphere 2017, 27, 1015 -1026.
AMA StyleSamieh Eskandari, Christopher N. Guppy, Oliver G.G. Knox, David Backhouse, Rebecca E. Haling. Mycorrhizal Symbioses of Cotton Grown on Sodic Soils: A Review from an Australian Perspective. Pedosphere. 2017; 27 (6):1015-1026.
Chicago/Turabian StyleSamieh Eskandari; Christopher N. Guppy; Oliver G.G. Knox; David Backhouse; Rebecca E. Haling. 2017. "Mycorrhizal Symbioses of Cotton Grown on Sodic Soils: A Review from an Australian Perspective." Pedosphere 27, no. 6: 1015-1026.
Stephanie C. Montgomery; Robert J. Martin; Chris Guppy; Graeme C. Wright; Matthew Tighe. Farmer knowledge and perception of production constraints in Northwest Cambodia. Journal of Rural Studies 2017, 56, 12 -20.
AMA StyleStephanie C. Montgomery, Robert J. Martin, Chris Guppy, Graeme C. Wright, Matthew Tighe. Farmer knowledge and perception of production constraints in Northwest Cambodia. Journal of Rural Studies. 2017; 56 ():12-20.
Chicago/Turabian StyleStephanie C. Montgomery; Robert J. Martin; Chris Guppy; Graeme C. Wright; Matthew Tighe. 2017. "Farmer knowledge and perception of production constraints in Northwest Cambodia." Journal of Rural Studies 56, no. : 12-20.
Root plasticity is a unique characteristic of root systems that may enhance the nutrient foraging capacity of plants. Here we investigated the effect of localized high nitrogen (N) concentration on plasticity of wheat and barley roots in soil. We conducted a series of experiments to maintain localized high concentration of N in soil and to evaluate any root morphological variation in the enriched N zone. Wheat and barley seedlings were grown in N responsive Red Ferrosol with an enriched subsurface N band for 12 days. Wheat and barley roots did not proliferate in N-enriched soil volumes. Rather, higher root length density (~1.6 times) was observed in low N surface soil. Shoot dry matter and shoot N uptake of banded N treatment was statistically similar between uniform and low N treatments. Results indicated the absence of plastic root response of the wheat and barley seedlings in subsurface N band.
Sheikh M. F. Rabbi; Christopher Guppy; Richard Flavel; Matthew Tighe; Iain Young. Root Plasticity Not Evident in N-Enriched Soil Volumes for Wheat (Triticum aestivumL.) and Barley (Hordeum vulgareL.) Varieties. Communications in Soil Science and Plant Analysis 2017, 48, 2002 -2012.
AMA StyleSheikh M. F. Rabbi, Christopher Guppy, Richard Flavel, Matthew Tighe, Iain Young. Root Plasticity Not Evident in N-Enriched Soil Volumes for Wheat (Triticum aestivumL.) and Barley (Hordeum vulgareL.) Varieties. Communications in Soil Science and Plant Analysis. 2017; 48 (17):2002-2012.
Chicago/Turabian StyleSheikh M. F. Rabbi; Christopher Guppy; Richard Flavel; Matthew Tighe; Iain Young. 2017. "Root Plasticity Not Evident in N-Enriched Soil Volumes for Wheat (Triticum aestivumL.) and Barley (Hordeum vulgareL.) Varieties." Communications in Soil Science and Plant Analysis 48, no. 17: 2002-2012.
The concept of carbon (C) saturation implies that soils have a finite capacity to store C in a stable form, depending on their silt + clay content. We hypothesized that the stabilization of added organic C would be low in C saturated soil. We tested experimentally the influence of C saturation deficit on stabilization of added grass residue. We incubated 12 highly weathered, oxic soil samples collected from three contrasting land uses (i.e. cropping, improved pasture, and forest) with grass residue for 8 months. Carbon saturation deficit of the forest soils was lower than pasture and cropping soils. After incubation, we found increases in silt + clay associated C in grass residue treatment positively correlated with C saturation deficit of soils. Our results suggest that stabilization of added C was high in soil with low C saturation level and hence higher C saturation deficit.
Tania Khandakar; Christopher Guppy; Matthew Tighe; Sheikh M. F. Rabbi; Heiko Daniel. Increased Carbon Stabilization in Australian Ferrosol with High Carbon Saturation Deficit. Communications in Soil Science and Plant Analysis 2017, 48, 1772 -1780.
AMA StyleTania Khandakar, Christopher Guppy, Matthew Tighe, Sheikh M. F. Rabbi, Heiko Daniel. Increased Carbon Stabilization in Australian Ferrosol with High Carbon Saturation Deficit. Communications in Soil Science and Plant Analysis. 2017; 48 (15):1772-1780.
Chicago/Turabian StyleTania Khandakar; Christopher Guppy; Matthew Tighe; Sheikh M. F. Rabbi; Heiko Daniel. 2017. "Increased Carbon Stabilization in Australian Ferrosol with High Carbon Saturation Deficit." Communications in Soil Science and Plant Analysis 48, no. 15: 1772-1780.
Timothy McLaren; Therese McBeath; Richard J. Simpson; Alan E. Richardson; Adam Stefanski; Christopher Guppy; Ronald J. Smernik; Colin Rivers; Caroline Johnston; Michael J. McLaughlin. Direct recovery of 33 P-labelled fertiliser phosphorus in subterranean clover ( Trifolium subterraneum ) pastures under field conditions – The role of agronomic management. Agriculture, Ecosystems & Environment 2017, 246, 144 -156.
AMA StyleTimothy McLaren, Therese McBeath, Richard J. Simpson, Alan E. Richardson, Adam Stefanski, Christopher Guppy, Ronald J. Smernik, Colin Rivers, Caroline Johnston, Michael J. McLaughlin. Direct recovery of 33 P-labelled fertiliser phosphorus in subterranean clover ( Trifolium subterraneum ) pastures under field conditions – The role of agronomic management. Agriculture, Ecosystems & Environment. 2017; 246 ():144-156.
Chicago/Turabian StyleTimothy McLaren; Therese McBeath; Richard J. Simpson; Alan E. Richardson; Adam Stefanski; Christopher Guppy; Ronald J. Smernik; Colin Rivers; Caroline Johnston; Michael J. McLaughlin. 2017. "Direct recovery of 33 P-labelled fertiliser phosphorus in subterranean clover ( Trifolium subterraneum ) pastures under field conditions – The role of agronomic management." Agriculture, Ecosystems & Environment 246, no. : 144-156.
The objective of this study was to develop a flexible and free image processing and analysis solution, based on the Public Domain ImageJ platform, for the segmentation and analysis of complex biological plant root systems in soil from x-ray tomography 3D images. Contrasting root architectures from wheat, barley and chickpea root systems were grown in soil and scanned using a high resolution micro-tomography system. A macro (Root1) was developed that reliably identified with good to high accuracy complex root systems (10% overestimation for chickpea, 1% underestimation for wheat, 8% underestimation for barley) and provided analysis of root length and angle. In-built flexibility allowed the user interaction to (a) amend any aspect of the macro to account for specific user preferences, and (b) take account of computational limitations of the platform. The platform is free, flexible and accurate in analysing root system metrics.
Richard Flavel; Christopher Guppy; Sheikh M. F. Rabbi; Iain M. Young. An image processing and analysis tool for identifying and analysing complex plant root systems in 3D soil using non-destructive analysis: Root1. PLOS ONE 2017, 12, e0176433 .
AMA StyleRichard Flavel, Christopher Guppy, Sheikh M. F. Rabbi, Iain M. Young. An image processing and analysis tool for identifying and analysing complex plant root systems in 3D soil using non-destructive analysis: Root1. PLOS ONE. 2017; 12 (5):e0176433.
Chicago/Turabian StyleRichard Flavel; Christopher Guppy; Sheikh M. F. Rabbi; Iain M. Young. 2017. "An image processing and analysis tool for identifying and analysing complex plant root systems in 3D soil using non-destructive analysis: Root1." PLOS ONE 12, no. 5: e0176433.
Stephanie Montgomery; Chris Guppy; Robert Martin; Graeme Wright; Richard Flavel; Sophanara Phan; Sophoeun Im; Matthew Tighe. Productivity and profitability of upland crop rotations in Northwest Cambodia. Field Crops Research 2017, 203, 150 -162.
AMA StyleStephanie Montgomery, Chris Guppy, Robert Martin, Graeme Wright, Richard Flavel, Sophanara Phan, Sophoeun Im, Matthew Tighe. Productivity and profitability of upland crop rotations in Northwest Cambodia. Field Crops Research. 2017; 203 ():150-162.
Chicago/Turabian StyleStephanie Montgomery; Chris Guppy; Robert Martin; Graeme Wright; Richard Flavel; Sophanara Phan; Sophoeun Im; Matthew Tighe. 2017. "Productivity and profitability of upland crop rotations in Northwest Cambodia." Field Crops Research 203, no. : 150-162.
Samieh Eskandari; Christopher Guppy; Oliver G.G Knox; David Backhouse; Rebecca E. Haling. Mycorrhizal colonisation of cotton in soils differing in sodicity. Pedobiologia 2017, 61, 25 -32.
AMA StyleSamieh Eskandari, Christopher Guppy, Oliver G.G Knox, David Backhouse, Rebecca E. Haling. Mycorrhizal colonisation of cotton in soils differing in sodicity. Pedobiologia. 2017; 61 ():25-32.
Chicago/Turabian StyleSamieh Eskandari; Christopher Guppy; Oliver G.G Knox; David Backhouse; Rebecca E. Haling. 2017. "Mycorrhizal colonisation of cotton in soils differing in sodicity." Pedobiologia 61, no. : 25-32.
Samieh Eskandari; Christopher N. Guppy; Oliver G.G. Knox; Richard J. Flavel; David Backhouse; Rebecca E. Haling. Mycorrhizal contribution to phosphorus nutrition of cotton in low and highly sodic soils using dual isotope labelling (32P and 33P). Soil Biology and Biochemistry 2017, 105, 37 -44.
AMA StyleSamieh Eskandari, Christopher N. Guppy, Oliver G.G. Knox, Richard J. Flavel, David Backhouse, Rebecca E. Haling. Mycorrhizal contribution to phosphorus nutrition of cotton in low and highly sodic soils using dual isotope labelling (32P and 33P). Soil Biology and Biochemistry. 2017; 105 ():37-44.
Chicago/Turabian StyleSamieh Eskandari; Christopher N. Guppy; Oliver G.G. Knox; Richard J. Flavel; David Backhouse; Rebecca E. Haling. 2017. "Mycorrhizal contribution to phosphorus nutrition of cotton in low and highly sodic soils using dual isotope labelling (32P and 33P)." Soil Biology and Biochemistry 105, no. : 37-44.
Differences in nutrient recovery from fertiliser bands may improve cereal variety selection. The objective of this study was to identify the variation in root plasticity across commonly grown Australian wheat (Triticum aestivum L.) cultivars in response to a phosphorus (P)-enriched band. Ten wheat cultivars were screened for root proliferation within a 150 mg P kg−1 band in P-responsive soil. Plants were destructively harvested at the four-leaf phenological stage and various growth parameters, including root length density (RLD), were measured on banded and uniformly adequate P treatments. All wheat cultivars increased RLD between three and nine times in the P band. However, there was no significant difference in root plasticity among the cultivars tested. Although all cultivars produced longer, though ≈ 9% thinner roots when responding to the P band, the phenotypic response was unable to compensate fully for the lower P status encountered in the soil. Despite 23% longer root lengths in the P-band treatments, P uptake per unit root length was 78% lower than in uniformly adequate P treatments. Our results indicate that root plasticity of wheat cultivars in a P-enriched band was phenotypically similar. Further research is necessary before selecting for wheat cultivars that respond to localised nutrient patches with increased RLD.
Sheikh M.F. Rabbi; Christopher Guppy; Matthew Tighe; Richard Flavel; Iain M. Young. Root architectural responses of wheat cultivars to localised phosphorus application are phenotypically similar. Journal of Plant Nutrition and Soil Science 2017, 180, 169 -177.
AMA StyleSheikh M.F. Rabbi, Christopher Guppy, Matthew Tighe, Richard Flavel, Iain M. Young. Root architectural responses of wheat cultivars to localised phosphorus application are phenotypically similar. Journal of Plant Nutrition and Soil Science. 2017; 180 (2):169-177.
Chicago/Turabian StyleSheikh M.F. Rabbi; Christopher Guppy; Matthew Tighe; Richard Flavel; Iain M. Young. 2017. "Root architectural responses of wheat cultivars to localised phosphorus application are phenotypically similar." Journal of Plant Nutrition and Soil Science 180, no. 2: 169-177.