Mapping of First-Frost Days and Risk of Forst Damage to Soybeans

Ryoji Sameshima, Tomoyoshi Hirota, Takahiro Hamasaki

Research output: Contribution to journalArticlepeer-review

3 Citations (Scopus)


Statistically expected early first-frost days with return periods from 2 to 30 y (EFFDk, where k represents the return period) were calculated by fitting frost records obtained at weather stations to the Weibull distribution function. To create 1 km2 mesh maps of EFFDk, a method to estimate EFFDkwas developed by relating k to the normals of daily minimum air temperature (Tm). An equation to calculate the probability of occurrence of the first frost before day x ((P (X ≤ x)) from Tm was derived. Risk of early first-frost damage to soybeans was defined as (P (X ≤ maturity day). Day of maturity was estimated with existing soybean developmental models, and risk maps of first-frost damage to soybeans were created.

Original languageEnglish
Pages (from-to)25-32
Number of pages8
Journaljournal of agricultural meteorology
Issue number1
Publication statusPublished - Sept 1 2007
Externally publishedYes

All Science Journal Classification (ASJC) codes

  • Agronomy and Crop Science
  • Atmospheric Science


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