Farm Table says:
The take home messages from this GRDC funded research are below. Please access the full paper via the link below for methodology, references, acknowledgements and discussion.
Take home messages from the paper include:
- All grain legume (pulse) crop residues generally have higher concentrations of nitrogen (N) and lower C to nitrogen ratio than cereal crops.
- The rate and timing of availability of N from pulse stubble to the following crops is determined by stubble decomposition rate and N immobilisation (tie-up) by soil micro-organisms.
- N mineralisation/tie-up processes after pulse crops can differ significantly to that after cereal and canola in terms of the (i) timing of release of N from residues (for example; during summer versus early into the following crop), (ii) magnitude of N tie-up during the seedling phase and (iii) the availability of fertiliser N to the cereal crop after a pulse crop.
- In low fertility soils, the combination of N release from pulse crops and N from fertiliser sources is required to maximise productivity benefits in the following crops.