Rainfall in late July and early August changes the outlook for grain growers in some parts of Western Australia. Earlier this month AEGIC released a statement on the changing fortunes of the 2015 season. The STIN model predicted the average wheat yield across the state of Western Australia moving from 1.53t/ha to 2.02t/ha in response to the rainfall.
For growers who received the rainfall:
- In the north it’s likely too late in the season for any management action to change crop yield outcomes.
- In the central region there’s now only a small time window for growers to apply additional nitrogen to chase the higher yield potential.
- Further south growers have a little more time to make their decisions. Nitrogen decisions are always best made on a paddock by paddock basis.
- Micronutrient deficiencies, particularly copper, can appear in late in the season. Tissue testing to confirm a deficiency and prompt application of a deficient micronutrient can improve yield up until flowering, although best done before early stem elongation.
Technical input provided by Liam Ryan, DAFWA and James Easton, CSBP