Fertiliser costs represent 20% to 25% of variable costs for growing grain crops. This proportion is likely to increase with the continued decline of soil organic matter and corresponding reduction in annual soil mineralisation of nitrogen (N) (e.g.Angus and Grace 2017). In approximate terms,the N mineralisation potential in cropping soilsis declining by 50% every 25 to 30 years. Soil mineralisation of N is not enough to meet crop demand, consequently N fertiliser is typically applied to wheat at sowing, stem elongation and occasionally at booting. The in-crop efficiencies offertiliser N retrieval vary greatly, with approximately 44% in above-ground plant parts, 34% in soil and 22% not recovered, which is presumably lost (Angus and Grace 2017). Increases in the efficiency with which wheat extracts fertiliser N from the soilcan result in substantial fertiliser savings.
|Title of host publication||Proceedings from the GRDC Update events series|
|Number of pages||8|
|Publication status||Published - 13 Feb 2018|
|Event||GRDC Grains Research Update - Charles Sturt University, Wagga Wagga, Australia|
Duration: 13 Feb 2018 → 13 Feb 2018
|Conference||GRDC Grains Research Update|
|Period||13/02/18 → 13/02/18|