FIELD: agriculture. SUBSTANCE: method involves performing daily measuring of air temperature and humidity, when lower tier pea beans become brown; calculating coefficient from formula: 
, where Tmax is maximum daily air temperature, C; Hmin is minimum daily relative air humidity, %; counting possible pea bean preharvest losses due to self-falling during maturing on the basis of obtained coefficient. When mentioned coefficient is within the range of 0.15-0.74, preharvest pea losses are considered minimum. Method may be used in selecting time for harvesting pea by direct combining. EFFECT: increased efficiency in performing harvesting works. 1 tbl, 2 ex
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