Canola - how many spring irrigations on a heavy clay?

Canola is a valuable crop in the rice farming system but growers often face the dilemma of how many spring irrigations are required to achieve good yields and profit. With water availability at a premium it is important to know if water required for an additional spring irrigation could be better utilised elsewhere.

Quick take:

  • One spring irrigation was sufficient for canola to achieve maximum grain yield on a self-mulching clay soil. Although little rainfall was received in spring, the soil moisture profile was full during winter.
  • Hyola 559TT yielded higher than Hyola 577CL in all irrigation treatments due to a higher harvest index.
  • There was no impact of nitrogen rate and nitrogen timing on canola growth and grain yield, regardless of irrigation treatment.

Brian Dunn, Research Agronomist, NSW Department of Primary Industries, Yanco

IREC Farmers’ Newsletter – Large Area No. 192: Autumn 2015. Read the full newsletter here.