The Blaney-Criddle formula for consumptive use (monthly ET) uses:
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Wind speed and radiation data
Mean monthly temperature and monthly percentage of daytime hours (p)
Soil type only
Rainfall data only
Correct Answer
B. Mean monthly temperature and monthly percentage of daytime hours (p)
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Blaney-Criddle: u = K x p x (0.46 T + 8) / 100 (monthly), where K = crop coefficient, p = monthly percent of annual daytime hours, T = mean monthly temperature (deg C). It is a temperature-based method useful when only temperature data is available.
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