Irrigated cotton growers stand to make substantial savings in fuel and greenhouse gas emissions in tractor operations if appropriate tractor engine and ground speeds are used and tillage depth is kept to the shallowes

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.

A strip tiller machine was assembled and used prior to cotton planting this season. Some practical problems associated with heavy clay soils showed up, and are being addressed.

A vision guidance system has been designed, built and commissioned which steers a tractor relative to the rows of a crop such as cotton.

Objectives 1. To develop a method for the measurement of mass flow of anhydrous ammonia fluid. 2.