Canola stubble retention

Holbrook Landcare Network - A. Clough et al.

Type: Research Paper
Knowledge level: Advanced

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.

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2013 - Australia - Holbrook Landcare Network - A. Clough et al.
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