Farmers involved in the 2023/24 Healthy Estuaries WA Nutrient Management Program recently came together at the Meadow Springs Golf and Country Club to receive their soil test results and nutrient maps, and to learn how to use this data to guide their fertiliser decisions. Using an evidence-based approach to nutrient management results in increased profits for the farmer and improved water quality in our rivers and estuary.

In the first session, experts from the Department of Primary Industries and Regional Development (DPIRD) took participants through a series of demonstrations to illustrate how phosphorous behaves in different soil types, and to introduce the concepts of Phosphorous Buffering Index (PBI) and ‘limiting nutrients’. Dave Rogers (DPIRD) conducted his famous Response Tank experiment; a clever experiment which demonstrates several concepts including the different rates at which available phosphorous increase and decrease in low PBI (e.g. sand) versus high PBI (e.g. clay/loam) soils; fertility index; and the ‘law of diminishing returns’.

Nutrient balance was demonstrated using an interactive board game during the second session of the workshop. The game was a huge hit with participants as it generated insightful discussion and clearly illustrated the benefit of using an evidence-based approach to nutrient management compared with a so-called ‘set-and-forget’ approach. As per the ‘law of diminishing returns’, farmers could see that continuing to apply phosphorous fertiliser beyond an optimal fertility index (‘set-and-forget’ model) did not result in equivalent returns in production and therefore profits.

If you are a livestock farmer in the Peel-Harvey region and you are interested in getting involved in the Healthy Estuaries WA Nutrient Management Program, please contact Amy Williams (amy.williams@peel-harvey.org.au)

This project is a part of Healthy Estuaries WA – a State Government Royalties for Regions program that aims to improve the health of our South West estuaries.

We acknowledge the Noongar people as Traditional Custodians of this land and pay our respects to all Elders past and present