Relevance. One of the priority areas of research at Heterosis Selection LLC is the creation of varieties and the development of regional agricultural technology for growing seed material of flower crops. The article represents the results of the study of intravarietal variability according to 7 structural features of marigolds (Tagetes patula L.) cv. Elena Prekrasnaya under the conditions of the Southern Urals. To develop a methodology of seed production of marigolds in the conditions of the Southern Urals, it is necessary to study a complex of morphological features and identify those that more fully contribute to the preservation and maintenance of the variety.Results. As a result of the study of intravarietal variability, it was found that the most stable traits of the variety of marigolds cv. Elena Prekrasnaya are the height of the plant, the diameter of the inflorescence, and the number of seeds in the inflorescence. Efficient selection when obtaining original seeds of marigolds cv. Elena Prekrasnaya will be when focusing on the signs of plant height and inflorescence diameter. In order to obtain high-quality seeds in the industrial seed production of marigold in the conditions of the Southern Urals, it should be kept in mind that in the period from August 20 to September 1, half of the potential seed yield ripens – 49.4%. The greatest uniformity of seed ripening (37.3% of the total yield) was noted on September 1. The harvesting of inflorescences during this period provided the production of seeds with high sowing qualities.

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Relevance. Gender phytoregulators occupy an important place in the seed production of parental forms of cucumber, they allow you to shift the sex of the plant in the right direction, increase the intensity of selection, obtain purely female lines, and increase the efficiency of hybrid seed production.Results. The paper presents the regulations for the use of Esfon on the breeding line ZhL 24, which is the mother form of the hybrid Rich garden F1. To obtain the maximum number of female flowers, without significant inhibition of vegetative growth, it is necessary to treat vegetative plants three times with an interval of 5 days, starting from the phase of the second true leaf, with a solution of Esfon (BP. 65%) at a concentration of 0.03% (300 mg/l) with the purpose of preventing closely related crosses and increasing the hybridity of seeds. This technique stimulates the earlier development of pistillate flowers, minimizes the formation of male flowering, increases the number of fruits per plant, their size and weight, which allows increasing the yield per unit area by 40%.