Abstract
A major aim of irrigation is to minimise plant water deficits. This paper describes the development of water deficits in field crops and the methods used to measure the deficit, with particular emphasis on their use in irrigation management. Examples from cotton, sunflower, lupin, pasture medic and sugarcane are used to demonstrate that mild water deficits do not necessarily reduce yields and in some circumstances can enhance yields. The implications of this for irrigation management are discussed.
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