The project focussed on phosphorus (P) and potassium (K) status of northern cropping soils.

Soil nutrients, in particular phosphorus (P) and potassium (K), are being depleted in the clay soils supporting the grains and cotton industries of northern NSW and Queensland, especially in the deeper layers of the s

The low responsiveness of cotton (Gossypium hirsutum L.) to phosphorus (P) fertilizers in the field where soils have low soil test values for P, suggests that cotton is capable of utilizing soil P pools that are less