The influence of methods of pre-sowing seed treatment and weather condition on the yield of standart bean varieties

The results of 18-year researches of influence of pre-sowing seed treatment methods and weather conditions on yield capacity of trunk varieties of beans of Pervomaisk and Dokuchaevsk are given. The pre-sowing seed treatment was carried out in two ways: on control - moistening with water, on other variants - inoculation with a suspension of strains of nodule bacteria. It has been established that over the years of the research the average yield of Pervomaisk beans was 1,68 t/ha in the control, in the variant with the most active rhizobia strains – 1,93 t/ha; Dokuchaevskaya variety yield capacity made up 1,72 and 1,95 t/ha, respectively. During the bean growing season, such climatic indicators as the amount of theb precipitation, the sum of the active temperatures, the hydrothermal coefficient, the relative humidity of the average and minimum, the minimum temperature on the soil surface, the maximum wind speed have been determined. The correlation and regression analysis proved that the yield capacity of beans is most affected by the amount of precipitation and the sum of the active temperatures for the period from sowing to harvesting. It is the indicator of their joint action - the hydrothermal coefficient that most significantly correlates with the yield capacity (r = 0,50–0,58). Key words: beans, trunk varieties, inoculation, rhizobia strains, yield capacity, weather conditions, correlation.