The empirical method for computing the consumptive use of a crop using the mean monthly temperature and day light hours is
Options:
(A) Thornthwaite
(B) Blaney Criddle
(C) Hargreaves
(D) Lowry Johnson
Official Answer Key:
B
Step-by-Step Solution & Explanation
The Blaney–Criddle method estimates monthly consumptive use as U = k·f, where the consumptive-use factor f = p(0.46T+8.13)/100 (SI form) is built directly from mean monthly air temperature (T) and monthly percentage of annual daytime/daylight hours (p). Thornthwaite (A) is temperature-based but uses a heat-index/day-length correction rather than daylight-hour percentage directly in this classic form; Hargreaves (C) uses solar radiation/temperature; Lowry–Johnson (D) is a different empirical ET formula. Hence (B).
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