Optimum summer index and average potential water deficit.
Abstract
Optimum summer index is based on the formula I = 10Tx + 20S-7R where Tx is mean daily temperature (°F), 5 mean daily sunshine (h) and R is total rainfall (in.) during June, July and Aug. The index was found to be closely correlated with potential water deficit, which could be estimated using the formula d = (1/100-5)2.-R.B.