Soil water depletion-yield relationships of irrigated sorghum, wheat, and soybeans

Musick, J.T. and New, L.L. and Dusek, D.A. (1976) Soil water depletion-yield relationships of irrigated sorghum, wheat, and soybeans. Transactions of the ASAE, 19 (3). pp. 489-493.

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In a study derived from irrigation management on a Pullman clay loam soil over 12 crop years, soil water depletion to a depth of 120 cm to -15 bar resulted in reductions in grain sorghum, winter wheat and soyabean yields of 27, 20 and 53%, respectively, compared with yields under adequate irrigation. Soil water depletion accounted for 57-99% of yield variability, was curvilinearly related to yield with a general similarity in all crops except in a very dry year and was 2.7 cm greater with grain sorghum and wheat than with soyabeans when yields were depressed by >30%. Greatest soil water depletions under prolonged stress were 4.6, 5.6 and 1.3 cm below -15 bar and plant available water, assumed to be the difference between -0.3 bar and the lowest point measured for each crop, was 20.3, 21.3 and 17 cm for grain sorghum, winter wheat and soyabeans, respectively

Item Type: Article
Author Affiliation: Southwestern Great Plains Research Centre, USDA, Bushland, Texas, USA
Subjects: Plant Protection
Divisions: Sorghum
Depositing User: Ms K Syamalamba
Date Deposited: 17 Jul 2012 10:27
Last Modified: 17 Jul 2012 10:27

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