Influence of hydrothermal conditions on the duration of the phenophase of common beans at different sowing dates in the forest-steppe conditions of the Ob region

The influence of hydrothermal conditions on the duration of phaseolus vulgaris L. phenophases of the grain direction at different sowing dates in the forest-steppe conditions of the Ob region was studied. The research was carried out on the experimental field of the training and production farm «Sad Michurintsev» at the Novosibirsk State Agrarian University. The objects of the study were the Rubin variety and the promising variety Krasno-pestriy. The structure of the growing season was studied and the samples were assessed by the duration of individual phenological phases. The influence of hydrothermal conditions on the change in the duration of the «sowing-emergence» interphase period was established at different sowing periods (up to 8 days) and the «seedlings-flowering» and «flowering-biological ripeness’ periods (up to 4 days). A one-way analysis of variance was carried out with a confidence interval of 5%. The optimal average sum of active temperatures for the passage of the main phenological phases «sowing-germination», «seedling-flowering» and «flowering-biological ripeness’ has been established: in Rubin it is 244, 518 and 709оС, and Krasno-pestriy is 241, 564 and 760оС, respectively. A relationship between the duration of the growing season and the average daily temperature (–0.90), the sum of temperatures (0.96), the duration of the growing season and the sum of precipitation (0.90) was revealed. The difference in precipitation of growing seasons at different sowing dates is insignificant and ranges from 120 to 131 mm. According to the results of the study, the recommended sowing time for the main groups of beans ripeness in the foreststeppe conditions of the Ob region is the second half of May.