Yield and Water‐Use Relationships: An Overview

This chapter reviews the information on yield and water-use relationships to make predictions of crop yield. The general approach is to first estimate crop transpiration and then from this estimate to calculate crop yield. Of critical importance in these predictions is, of course, the relationship between yield and transpiration. Most of these "water-requirement" studies have concentrated on the climatic factors that influence water use for maximum crop production. Thus crop yield relations have not been considered in any detail. Recent emphasis on yield-water-use studies have been conducted because of the increasing scarcity of water for irrigation. J. C. Andersen and R. J. Hanks have used the model of Childs and Hanks to predict economic relations of saline irrigation water. They put an economic value on the relation of irrigation management to the salt content of the drainage water.

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