K responses on loamy soils: An emerging issue for grain crops

This GRDC Update Paper discusses how yield responses to K fertiliser are now demonstrated on loamy soil due to run down in soil K levels.

Estimating plant-available potassium in loamy soil

Updating knowledge for better potassium fertiliser decision making on heavy-textured soil.

Optimising fertiliser application – what level of precision can we achieve?

This paper assesses the influence of recent changes in fertiliser and grain prices on economically optimum N, P and K fertiliser rates.