We used APSIM to compare the profit and risk (economic and environmental) for a farmer in the medium rainfall zone of South Australia who applied the same amount N to wheat every year with a farmer that was guided by POAMA to tactically change rates. Over the 30 year period from 1981 to 2010 a farmer following POAMA would have received the correct guidance 19 times and incorrect guidance 11 times. Depending on the amount of nitrogen (N) used, following POAMA increased the gross margin by $23 or 9%. Forecasts didn’t reduce the risk of nitrous oxide emissions or N leaching. Under the assumptions of this simulation study, the most economically sound N strategies come from a focus on fertiliser N use efficiency which keeps rates at levels where losses to de-nitrification or leaching are minimal.
|Title of host publication||Proceedings 17th Australian Agronomy Conference|
|Editors||Tina Botwright Acuña, Matthew Harrison, Carina Moeller, David Parsons|
|Place of Publication||Australia|
|Publisher||Australian Society for Agronomy|
|Number of pages||4|
|Publication status||Published - 2015|
|Event||17th Australian Agronomy Conference - Wrest Point Convention Centre , Hobart, Australia|
Duration: 20 Sep 2015 → 24 Sep 2015
|Conference||17th Australian Agronomy Conference|
|Abbreviated title||Building Productive, Diverse and Sustainable Landscapes|
|Period||20/09/15 → 24/09/15|
Hayman, P., Cooper, B., Parton, K., Alves, O., Young, G., Henry, B., & Scheer, C. (2015). Can advances in climate forecasts improve the productive and environmental outcomes from nitrogen fertiliser on wheat? A case study using POAMA for top-dressing wheat in South Australia. In T. Botwright Acuña, M. Harrison, C. Moeller, & D. Parsons (Eds.), Proceedings 17th Australian Agronomy Conference (pp. 1-4). Australian Society for Agronomy.