Phosphorus placement for wheat and lupins in WA cropping systems
Chen, W., Bell, R., Brennan, R. and Bolland, M. (2010) Phosphorus placement for wheat and lupins in WA cropping systems. In: 2010 WA Agribusiness Crop Updates, 25 - 26 February, Perth, Western Australia.
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Significant vertical stratification of soil nutrients, particularly soil immobile nutrients (such as phosphorus (P)) in long-term zero-till fields has been reported in both Australia and overseas (White 1990; Howard et al. 1999). Soil nutrient vertical stratifications could have a significant impact on availability of nutrients to crops, as soil immobile nutrient availability, root growth and activity are more vulnerable to drought in the surface soil layer than those in sub-surface layers. Placing fertiliser deeper in soil may improve nutrient uptake by crops in soils with nutrient stratification. However, the reported crop grain yield (GY) responses from deep P fertiliser placement in the field experiments being conducted across different states in Australia have been inconsistent. This paper combines analysis of literature data and APSIM simulations to evaluate the key factors (such as crop type, season and, etc.) driving the crop GY responses from deep P placement so that site-specific P placement advice could be developed to improve crop P use efficiency.
|Publication Type:||Conference Paper|
|Murdoch Affiliation:||School of Environmental Science|
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