There is an increasing use of spreaders for application of urea in the cotton industry.

Organic matter in soil can supply more than 50% of the nitrogen (N) to cotton crops, but this pool of N supply is dynamic and difficult to predict.

The objective of the experiments reported in this paper is to determine the fate of fertilizer nitrogen applied to the grey clays in the Namoi Valley.

Cotton growers commonly apply nitrogen (N) fertilizer at rates of between 100 and 200 kg N/ha, yet the cotton plants seldom recover more than 40% of the applied N, and often much less.