In the development of canopy reflectance-based crop coefficient (K cr), the soil adjusted vegetation index values of bare soil and 'effective' full cover canopy reflectances are linearly transformed using the corresponding basal (K cb) crop coefficients. This approach has been validated for alfalfa, barley, beans, corn, cotton, potato, sugar beet, and wheat. The basal (K cb) crop coefficient curve assumes uniform ideal crop growth in the field however the actual crop development calls for systematic adjustments of the K cb curve to match the actual growth profile. In the present paper, different instances of variability in actual crop growth are presented. The corresponding influence on the end points of K cb-SAVI linear transformation has been studied using the actual seasonal crop canopy reflectance curves of beans, potato, and sugar beet crops. This data was collected as a part of a multi-year research study towards development of corresponding canopy reflectance-based crop coefficients (K cr), Kimberly, Idaho during 1998 and 1999 seasons.