Abstract
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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