Search Results - "Armstrong, Roger D"

Phosphorus speciation in mature wheat and canola plants as affected by phosphorus supply by Noack, Sarah R, McLaughlin, Mike J, Smernik, Ronald J, McBeath, Therese M, Armstrong, Roger D

“…BACKGROUND AND AIMS: As plants approach maturity and start to senesce, the primary sink for phosphorus (P) is the seed but it is unclear how plant P status…”
Get full text

Does Elevated [CO 2 ] Only Increase Root Growth in the Topsoil? A FACE Study with Lentil in a Semi-Arid Environment by Bourgault, Maryse, Tausz-Posch, Sabine, Greenwood, Mark, Löw, Markus, Henty, Samuel, Armstrong, Roger D, O'Leary, Garry L, Fitzgerald, Glenn J, Tausz, Michael

“…Atmospheric carbon dioxide concentrations [CO ] are increasing steadily. Some reports have shown that root growth in grain crops is mostly stimulated in the…”
Get full text

Crop residue phosphorus: speciation and potential bio-availability by Noack, Sarah R., McLaughlin, Mike J., Smernik, Ronald J., McBeath, Therese M., Armstrong, Roger D.

“…Background and Aims Phosphorus (P) mineralisation from crop residues is usually predicted from total P or carbon: phosphorus (C: P) ratios. However, these…”
Get full text

Residue decomposition and soil carbon priming in three contrasting soils previously exposed to elevated CO2 by Butterly, Clayton R., Armstrong, Roger D., Chen, Deli, Tang, Caixian

“…The effects of elevated atmospheric carbon dioxide (eCO 2 ) on belowground processes are known to occur directly and indirectly via plants. However, the…”
Get full text

Sequestration of Phosphorus‐Binding Cations by Complexing Compounds is not a Viable Mechanism to Increase Phosphorus Efficiency by Degryse, Fien, Ajiboye, Babasola, Armstrong, Roger D., McLaughlin, Mike J.

“…There is increasing interest in enhancing the efficiency of P fertilizers or mobilizing fixed P from soil. Cation‐complexing ligands are claimed to increase…”
Get full text

Elevated CO₂ induced rhizosphere effects on the decomposition and N recovery from crop residues by Butterly, Clayton R., Wang, Xiaojuan, Armstrong, Roger D., Chen, Deli, Tang, Caixian

“…Background & aims Elevated atmospheric CO₂ (eCO₂) can affect soil-plant systems via stimulating plant growth, rhizosphere activity and the decomposition of…”
Get full text

Management of crop residues affects the transfer of phosphorus to plant and soil pools: Results from a dual-labelling experiment by Noack, Sarah R., McBeath, Therese M., McLaughlin, Mike J., Smernik, Ronald J., Armstrong, Roger D.

“…Release of nutrients, including phosphorus (P), from crop residues remaining post-harvest is an important potential source of nutrients for subsequent crops. A…”
Get full text

Nitrogen use efficiency of 15N urea applied to wheat based on fertiliser timing and use of inhibitors by Wallace, Ashley J., Armstrong, Roger D., Grace, Peter R., Scheer, Clemens, Partington, Debra L.

“…Improving fertiliser nitrogen (N) use efficiency is essential to increase productivity and avoid environmental damage. Using a 15 N mass balance approach, we…”
Get full text

Fertiliser timing and use of inhibitors to reduce N2O emissions of rainfed wheat in a semi-arid environment by Wallace, Ashley J., Armstrong, Roger D., Harris, Robert H., Belyaeva, Oxana N., Grace, Peter R., Partington, Debra L., Scheer, Clemens

“…Nitrogen (N) management is critical to the profitability of grain production systems, however careful management of fertiliser is needed to minimise…”
Get full text

Delaying nitrogen fertiliser application improves wheat 15N recovery from high rainfall cropping soils in south eastern Australia by Harris, Robert H., Armstrong, Roger D., Wallace, Ashley J., Belyaeva, Oxana N.

“…Improving nitrogen (N) fertiliser uptake of crops growing in soils susceptible to waterlogging could potentially reduce fertiliser input costs and harmful…”
Get full text

Can nitrogen fertiliser and nitrification inhibitor management influence N2O losses from high rainfall cropping systems in South Eastern Australia? by Harris, Robert H., Officer, Sally J., Hill, Patricia A., Armstrong, Roger D., Fogarty, Kirsten M., Zollinger, Reto P., Phelan, Andrew J., Partington, Debra L.

“…Nitrous oxide (N 2 O) is a potent greenhouse gas released from high rainfall cropping soils, but the role of management in its abatement remains unclear in…”
Get full text

Assessing crop residue phosphorus speciation using chemical fractionation and solution 31P nuclear magnetic resonance spectroscopy by Noack, Sarah R., Smernik, Ronald J., McBeath, Therese M., Armstrong, Roger D., McLaughlin, Mike J.

“…At physiological maturity, nutrients in crop residues can be released to the soil where they are incorporated into different labile and non-labile pools while…”
Get full text

Phosphorus availability for three crop species as a function of soil type and fertilizer history by Vu, Dang T, Armstrong, Roger D, Sale, Peter W. G, Tang, Caixian

“…Knowledge of the capacity of a soil to supply phosphorus (P), and the variation in the ability of different crops to access soil P, is critical to successfully…”
Get full text

Changes in P Bioavailability Induced by the Application of Liquid and Powder Sources of P, N and Zn Fertilizers in Alkaline Soils by Bertrand, Isabelle, McLaughlin, Mike J, Holloway, Robert E, Armstrong, Roger D, McBeath, Therese

“…Alkaline and/or calcareous soils provide significant challenges for management of crop P nutrition, due to rapid fixation of P into sparingly soluble forms not…”
Get full text

Long-term effects of elevated CO2 on carbon and nitrogen functional capacity of microbial communities in three contrasting soils by Butterly, Clayton R., Phillips, Lori A., Wiltshire, Jennifer L., Franks, Ashley E., Armstrong, Roger D., Chen, Deli, Mele, Pauline M., Tang, Caixian

“…Elevated atmospheric CO2 (eCO2) affects soil-plant systems by stimulating plant growth, rhizosphere processes and altering the amount and quality of organic…”
Get full text

Identifying soil and climate drivers of soil water conditions favourable for deep phosphorus placement for wheat in Australia using spatial modelling by Verburg, Kirsten, Armstrong, Roger D., Biggs, Jody S., Wilhelm, Nigel S., Haling, Rebecca E., Sandral, Graeme, Uddin, Shihab, Mason, Sean D., McBeath, Therese M.

“…Phosphorus (P) fertiliser is often placed shallow, near the seed, and plant-available P tends to be concentrated in the topsoil (0–5 cm), because of its…”
Get full text

Organic nitrogen cycling microbial communities are abundant in a dry Australian agricultural soil by Phillips, Lori A., Schefe, Cassandra R., Fridman, Masha, O'Halloran, Nicholas, Armstrong, Roger D., Mele, Pauline M.

“…Some microbial nitrogen (N) cycling processes continue under low soil moisture levels in drought-adapted ecosystems. These processes are of particular…”
Get full text

Nitrogen use efficiency and N2O emissions vary according to seasonal water supply across different cereal production systems of south eastern Australia by Wallace, Ashley J., Armstrong, Roger D., Grace, Peter R., Scheer, Clemens

“…Application of nitrogen (N) fertiliser is vital to the productivity of grains production systems. However, losses can result in negative environmental impacts…”
Get full text

Elevated CO.sub.2 induced rhizosphere effects on the decomposition and N recovery from crop residues by Butterly, Clayton R, Wang, Xiaojuan, Armstrong, Roger D, Chen, Deli, Tang, Caixian

“…Background & aims Elevated atmospheric CO.sub.2 (eCO.sub.2) can affect soil-plant systems via stimulating plant growth, rhizosphere activity and the…”
Get full text

Elevated CO sub(2) induced rhizosphere effects on the decomposition and N recovery from crop residues by Butterly, Clayton R, Wang, Xiaojuan, Armstrong, Roger D, Chen, Deli, Tang, Caixian

“…Elevated atmospheric CO sub(2) (eCO sub(2)) can affect soil-plant systems via stimulating plant growth, rhizosphere activity and the decomposition of added…”
Get full text