INFLUENCE OF THE TEMPERATURE AND HUMIDITY REGIME AND GROWTH REGULATORS THE YIELD AND SUGARITY OF BERRIES OF THE CITRINE TABLE GRAPE VARIETY IN THE CONDITIONS OF PRIDNESTROVIE
The article presents the results of field experiments to study the effect of double treatment of plants with growth regulators like gibberellin, mycephite, zircon, HB-101 the weight of the bunch, the number of berries in the bunch, the yield and sugar content in the juice of the berries of the Citrine table grape variety in the years differing in temperature and humidity conditions in the period rom sap flow to harvest. Phenological observations and agrobiological surveys were carried out according to the method of M.V. Melkonyan and V.A. Volynkin. Selyaninov's hydrothermal coefficient was used to assess the moisture content on the phases of grape vegetation. During the years of research, significant differences were noted in moisture supply in the main phases of grape development and insignificant in the sum of active temperatures. The research results showed that in the conditions of Pridnestrovie, the mass of a bunch of the Citrine table grapes variety is determined both by the conditions of the year and by the influence of growth regulators. The use of gibberellin, mycephyte, zircon and HB-101 reduced the adverse effect of precipitation during blossoming and led to a significant increase in the number of berries in a bunch, contributed to a decrease in the number of pea-berry in a bunch during drought in the period of growth and ripening phases. Under conditions of a higher moisture supply during the ripening period of berries, growth regulators did not have a noticeable effect the sugar content in the juice of berries; under arid conditions, the sugar content of the juice of berries in the experimental plants was higher than in the control plants. Mycephite contributed to a significant increase in the mass of a grape bunch, both in arid and more humid conditions, as a result of which the yield increased by 12.2 and 7.7 t / ha, or 88 and 53%, respectively, in comparison with the control.