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Corn Crop Curve Comparisons for the Central and Northern Plains of the U.S.

Published by the American Society of Agricultural and Biological Engineers, St. Joseph, Michigan

Citation:  Applied Engineering in Agriculture. 4(3): 226-233. (doi: 10.13031/2013.26612) @1988
Authors:   E. C. Stegman
Keywords:   Crop coefficients, Fraction of season, Irrigation scheduling

CROP curves, as originally developed for application in Kansas, Nebraska, Colorado, and North Dakota were represented as functions of a dimensionless unit; Fraction of Season (FOS) computed as the relative growing degree days from crop emergence to physiologic maturity. A high degree of commonality (Kansas vs. North Dakota) was obtained for resulting "mean curves" (Kcm type) for application to the unmodified Jensen-Haise equation. Agreement (North Dakota vs. Nebraska) was very good between "basal curves" (Kcb type) for application to a modified Penman equation. Agreement for Kcm curves (Eastern Colorado vs North Dakota) was good after the early vegetative period.

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