Unique Consumptive Use Curve Related to Irrigation Practice

by Vaughn E. Hansen,

Serial Information: Journal of the Irrigation and Drainage Division, 1963, Vol. 89, Issue 1, Pg. 43-50

Document Type: Journal Paper


By relating consumptive use to a suitable measure of weather conditions, such as evaporation, much of the variation in consumptive use disappears from day to day. The consumptive use-evaporation ratio has a minimum value when emergence occurs, increases to a peak at the beginning of flowering, and then diminishes until harvest occurs or the crop is essentially dead. By relating the consumptive use-evaporation ratio to relative growth, a unique curve results, which represents most agricultural crops. Three distinct stages of growth exist: Vegetative, flowering, and fruiting with the fruiting stage being considered in two parts - a wet fruit stage and a dry fruit stage. Irrigation practice can be related to the stages of growth and thus to the ratio of consumptive use to evaporation. Irrigation should be adjusted while the consumptive use-evaporation ratio is increasing to stimulate vegetative growth and to stimulate flowering near the peak values, followed by wet fruit, and finally by dry fruit during the final stages of maturity when the plant approaches a dormant or dead condition.

Subject Headings: Curvature | Evaporation | Crops | Vegetation | Irrigation

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