CSD conducts large scale variety trials in all the cotton growing districts each season. It is well known that variety performance often differs markedly from season to season.

Mycorrhizas are symbiotic associations between the roots of plants and fungi. They come into existence when the plant's root system becomes infected with an appropriate fungus.

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.