Calculator can appraise paddock performance

Author: Natalie Lee | Date: 28 Feb 2014

Which areas in your 2013 wheat crop did not reach their yield potential?

Growers can find out with the aid of the Yield Constraint Calculator, developed by the Department of Agriculture and Food (DAFWA) with support from the Grains Research and Development Corporation (GRDC).

Available at, it is among the tools developed under Western Australia’s ‘MyCrop’ project which aims to help growers and advisers diagnose limits to achieving potential grain yield.

DAFWA’s Kelly Ryan, who is leading the project, said the Yield Constraint Calculator provided potential wheat yields for one or more paddocks or zones.  

“Based on the modified French and Shultz equation, this tool estimates water-limited yield potential to account for soil plant available water capacity, stored soil water at sowing and the gross amount of seasonal rainfall,” she said.

“Linked to more than 670 weather stations, growers can graph actual wheat yields compared with potential yields as determined by rainfall.

“If the Yield Constraint Calculator shows that there is a big difference between a grower’s potential and actual yields, they may want to investigate why.”

For Interviews

Kelly Ryan, DAFWA
08 9368 3480, 0457 000 833

GRDC Project Code DAW00217

Region West