Mapping of first-frost days and risk of frost damage to soybeans [Glycine max]
2007
Sameshima, R.(National Agricultural Research Center for Hokkaido Region, Sapporo (Japan)) | Hirota, T. | Hamasaki, T.
Statistically expected early first-frost days with return periods from 2 to 30 y (EFFDsub (k), where k represents the return period) were calculated by fitting frost records obtained at weather stations to the Weibull distribution function. To create 1 square km mesh maps of EFFDsub(k), a method to estimate EFFDsub(k) was developed by relating k to the normals of daily minimum air temperature (Tsub(m)). An equation to calculate the probability of occurrence of the first frost before day x ((P(X-x)) from Tsub(m) was derived. Risk of early first-frost damage to soybeans was defined as (P(X-maturity day). A day of maturity was estimated with existing soybean developmental models, and risk maps of first-frost damage to soybeans were created.
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