The influence of canola stubble management on wheat production in the Holbrook area of southern NSW
The key messages outlined in this factsheet are:
- Retaining high stubble loads reduces the amount of nitrogen available to the next crop.
- Reduced available nitrogen in soil can be overcome by applying nitrogen fertiliser.
- Lower amounts of nitrogen fertiliser are needed to overcome immobilisation when stubble is left standing.
- Higher amounts of nitrogen fertiliser are needed to overcome immobilisation when over 5 t/ha of stubble is mulched or incorporated.
- No more than 50 kg N/ha is needed to overcome the detrimental effects on grain yield of retaining heavy stubble loads.
Key results included:
Applying 25 kg N/ha to wheat at Holbrook mitigated the detrimental effects of stubble retention in the less intensive systems (Table 1A). Black text in the table shown where 25 kg N/ha produced grain yields equal or better than those obtained after burning stubble without N fertiliser.
Up to 50 kg N/ha needs to be applied to mitigate the detrimental effects of stubble retention when higher stubble loads are retained using practices that result in stubble being in contact with the soil.
Add to favorites