The relation of solar radiation to evapotranspiration from cotton

Evapotranspiration affects the irrigation requirements of crops, and a simple method is needed for determining ET. The evapotranspiration equivalent of solar radiation (RS) is easily computed from data readily available from the U.S. Weather Bureau. The ET/RS ratio for cotton irrigated at Watkinsville, Georgia, showed that Rs data can be used to predict irrigation needs when the ET/RS ratio, daily rainfall, and available water capacity of the soil are known.