| cal_Kcend_for_singleKc {simET} | R Documentation |
Crop coefficient for the end of the late season stage
Description
Typical values for the crop coefficient at the end of the late season growth stage, Kc end, are listed in Table 12 for various agricultural crops.
Usage
cal_Kcend_for_singleKc(RHmine, u2e, Ktable, he)
Arguments
RHmine |
mean value for daily minimum relative humidity during the mid-season growth stage , for 20 <= RHmine<= 80 |
u2e |
mean value for daily wind speed at 2 m height over grass during the mid- season growth stage (m/s), for 1 <= u2e <= 6 |
Ktable |
value for Kc mid taken from Table 12 |
he |
mean plant height during the mid-season stage (m) for 0.1 m < h < 10 m |
Value
A value for Kcend value
Note
only applied when the tabulated values for Kc end exceed 0.45. The equation reduces the Kc end with increasing RHmin. This reduction in Kc end is characteristic of crops that are harvested 'green' or before becoming completely dead and dry (Kc end >= 0.45).
No adjustment is made when Kc end (Table) < 0.45 (Kc end = Kc end (Tab)). When crops are allowed to senesce and dry in the field (as evidenced by Kc end < 0.45), u2 and RHmin have less effect on Kc end and no adjustment is necessary.
References
Allen, R. G., Pereira, L. S., Raes, D., & Smith, M. FAO Irrigation and drainage paper No. 56. Rome: Food and Agriculture Organization of the United Nations, 1998.