Farmers in Australia apply between 80 and 200 kg N ba-1 to cotton, but only part of this nitrogen is taken up and used by the crop, and the remainder is lost :from the plantsoil system.

Obviously, avoiding trafficking wet soil is one means of avoiding soil structural damage. Another is to use a vehicle with lower ground pressure, by using dual tyres, wide tracks, etc.

Previous research at Narrabri Agricultural Research Station and elsewhere has shown that mite populations increase more slowly on okra leaf cotton genotypes than on normal leaf genotypes (Bailey et al., 1978; Thomson,

The insecticide, endosulfan, is still an effective weapon in the arsenal against Hellothis pest species. It fs used extensively in spring and summer as a cheap alternative to the synthetic pyrethroids.

As more than 94% of the Australian crop is exported, the world situation has greater bearing on the outlook for the Australian grower than most of his competitive counterparts who have the benefit of their own large d