Updates and advances to the FAO56 crop water requirements method
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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).