Combined nitrogen inputs from lupin stubble and fertiliser improves wheat productivity on sands

CSIRO Agriculture and Food, The University Adelaide - Pilar Muschietti-Piana et al.

Type: Research Paper
Knowledge level: Advanced

Farm Table says:

These trials showed that that yield gains over and above those from a legume-break crop can be achieved by using N fertiliser inputs of 20-40 kgN/ha.

This research aimed to provide answers to questions about management of N or legume residues for wheat productivity.

The trial in 2016 replicated treatments in sandy soil plots at Karoonda sands combining 3 stubble treatments from the 2015 cropping season. The results summary table is presented below.

The following key takeaways are provided:

  • Without N fertiliser, wheat following lupins yielded more than double continuous wheat (1.7 vs 3.6 t/ha). A further 27 % yield increase (4.9 t/ha) was achievable when 40 kg N/ha was added to wheat following lupins.
  • Increasing N fertiliser inputs on a wheat crop following legumes can improve crop performance and N uptake.
  • The mineralisation potential of N in a sandy soil is improved by including lupin in the crop sequence and increased N fertiliser inputs to wheat crops.
  • Net N mineralisation over the fallow following lupins can be as high as 32 kg N/ha in a Mallee sandy soil
2016 - Australia - CSIRO Agriculture and Food, The University Adelaide - Pilar Muschietti-Piana et al.
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