This project utilises information from Emerald and other irrigation districts in the State to develop a scheduling system, WATERSCHED, as part of a Cotton Management Decision Program. OBJECTIVES 1. To determine cotton yield response functions to differing levels of irrigation water and nutrients, to enable farmers to make better decisions on use of those input resources. 2. To develop a Cotton Management Decision Program which provides commercially relevant options of water scheduling and fertiliser application for extension officers, consultants and cotton growers, to optimise crop profitability. To increase the adoption by farmers of beneficial water management and fertiliser practices.