Yields of early ripening tomato varieties and impact of air temperature during main phases of ontogenesis on fruit yield

In accordance with the program of study of selection and crops complex evaluation, the 18 determinant tomato varieties and hybrids of domestic and foreign breeding were used. All of them are included in the State Register of Breeding Achievements Approved for use in the North Caucasus region. The results of the fruiting time, the productivity and the impact of air temperature during main phases of ontogenesis of early ripening varieties in non-sowing culture in the conditions of Dagestan are shown. The coefficients of variation of yield depending on the variety and year of growing of tomato early culture are found. The correlation coefficient between time of fruiting and total yield of early fruit ripening varieties of tomato was revealed. The characteristic of rate of diseases susceptibility of tomato varieties is given.