Nitrogen availability for crop production may be reduced under current farming methods in Western Australia. This study investigated soil mineral nitrogen and crop residue dynamics in relation to grain yield for two contrasting crop rotations under no-tillage. Growing wheat in rotation with legume and canola increased grain yield only in growing seasons of above average rainfall. Monoculture wheat with nitrogen fertiliser had similar yields to wheat in rotation with no nitrogen applied in most years, but caused a reduction in the mineralisation of soil nitrogen. Crop residue was found to play an important role in recycling nitrogen under no tillage.
|Qualification||Doctor of Philosophy|
|Award date||4 Jul 2017|
|Publication status||Unpublished - 2017|