Previous research into the nitrogen (N) nutrition of cotton has primarily focused on the mineral N pool, particularly nitrate, due to its association with synthetic fertilisers.

The impact of legumes after 21 years of rotation (11 legume crops) continue to positively impact soil health. The addition of a legume in a cotton rotation impacts all aspects of the cotton production.

The purpose of the travel was to attend the 5th Joint Australian and New Zealand Soil

Science Conference in Hobart, Tasmania from the 2-7 December 2012 to present the

Soil organic carbon storage in four irrigated cotton cropping systems sown on permanent beds in a cracking clay with subsoil sodicity was determined over a 9-year period in a trial near Narrabri, NSW.

salinity, and low exchangeable K concentrations are common constraints in many cracking clays. Recommendations for ameliorating sodicity include applying gypsum alone or in combination with deep tillage.