Discussion
The formula for estimation of evapotranspiration using only temperature and day length is?
Answer: A
The formula using only temperature and day length is the Blaney Criddle formula.
The Blaney-Criddle method estimates consumptive use from the mean monthly temperature and the percentage of annual daytime hours in the month, multiplied by a crop coefficient. It needs only these two climatic inputs, which made it popular where data are scarce.
The Penman method combines energy balance and aerodynamic terms and needs radiation, humidity and wind speed as well. The Christiansen formula uses several climatic factors, including radiation or pan evaporation, humidity and wind.
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