Description Usage Arguments Value
Per Hargreaves & Samani 1985. (Shuttleworth 1993 seems to incorrectly omit the exponent)
1  | hargreaves(S0, tmean, tmin, tmax)
 | 
S0 | 
 numeric  | 
tmean | 
 degrees C  | 
tmin | 
 degrees C  | 
tmax | 
 degrees C  | 
evapotranspiration (ETP) in mm/day
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