Predicting Irrigation Requirements of Crops

by Wilfredo P. David, Res. Assoc.; Dept. of Agric. Engrg., Iowa State Univ., Ames, IA,
Edward A. Hiler, Assoc. Prof.; Dept. of Agric. Engrg., Texas A&M Univ., College Station, TX,

Serial Information: Journal of the Irrigation and Drainage Division, 1970, Vol. 96, Issue 3, Pg. 241-255

Document Type: Journal Paper


A continuous soil moisture accounting model based on soil moisture depletion equations was developed. The model was adapted to an 18.6-acre experimental watershed and was used to estimate the monthly and seasonal irrigation requirements of cotton and grain sorghum. The distributions of the irrigation requirements of both crops as based on a 30-yr sample were found to be normal. Weekly rainfall probabilities for the watershed were calculated from a 30-yr sample using the incomplete gamma density function. The use of weekly rainfall probabilities in irrigation planning is shown.

Subject Headings: Irrigation | Crops | Soil water | Watersheds | Probability | Seasonal variations | Rain water | Gamma function

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