RHmin 100e0Tmine0Tmax568

where Tmin and Tmax also refer to the midseason or the end-season periods [see Eq. (5.8)].

For frequent irrigation of crops (more frequently than every 3 days) and where (Kcmid)tab < 1.1, replace (Kcmid)tab with approximately 1.1 to 1.3 to account for the combined effects of continuously wet soil.

Equation (5.67) is only applied for Kcend when (Kcend)tab exceeds 0.45. When crops are allowed to reach senescence and dry in the field (Kcend < 0.45), U2 and RHmin have less effect on Kcend and no adjustment is necessary.

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