Updates and advances to the FAO56 crop water requirements method

This study reviews the abundant research on FAO56 crop coefficients, published following introduction ofthe FAO56 paper in 1998. The primary goal was to evaluate, update, and consolidate the mid-season andend-season single (Kc) and basal (Kcb) crop coefficients, tabulated for many field crops in FAO56. The reviewfound that the prevalent approach for estimating crop evapotranspiration (ETc) is the FAO56Kc-EToapproach,i.e., the product of theKcand reference evapotranspiration (ETo)