The sources of nutrient accumulation in beans and bean seeds are the process of photosynthesis, root nutrition during the seed filling period, as well as the reutilization of substances accumulated in the vegetative organs in the previous period. The close dependence of the competition intensity on the number of plants per unit area of sowing is revealed. It was found that although increased nitrogen doses significantly reduce the competitive mutual inhibition of plants, it begins earlier than with a low nitrogen nutrition level. The main factor for which bean plants compete during the emergence-beginning of flowering phase under normal cultivation conditions is the available soil nitrogen. Therefore, the nitrogen fertilizers rational use leads to a more complete phenotypic manifestation of the vegetable beans genetically determined productivity.

The article presents the results of the study of the growth stimulator Zircon concentreation influence on the decorative qualities of large-flowered eustoma of White Kyoto F1 and Flamenco pink F1 hybrids. In the experiment, the drug concentration was studied from 0.25 to 5.0%. The drug foliar application affected the height of the plant, the number of leaves and their size, the passage of phenological phases by plants and the duration of flowering. The most effective was the use of Zircon with a solution concentration of 2.5%.

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Physiologically active substances play an important role in the formation of the vegetable crops harvest, influencing the timing of product receipt, its size and quality. In the Krasnodar Territory, the leading place among vegetable crops in the open ground is occupied by solanum lycopersicum L., the crop stability of which is complicated by high temperatures and insolation during the growing season. Using the drug Atlante Plus makes it possible to increase the stress resistance of plants, provide the necessary phosphorus-potassium nutrition. Studies conducted in 2021 in the central zone of the Krasnodar Territory revealed the drug effectiveness for pre-sowing seed preparation and spraying of solanum lycopersicum L. plantings during budding. Soaking seeds in the drug solution with the concentration of 0.005 % increased their germination energy and laboratory germination, activated growth processes in seedlings. Spraying of vegetat-ing plants with a solution of the same concentration increased the leaf surface area by 28 cm2, and the productivity of one plant – by 180 g.

The article presents the research results on the effect of the humic preparation BioHumus Grand Flora Victoria on the formation of lettuce crop in a winter glazed heated greenhouse. The sowing qualities of seeds (germination, germination energy) were analyzed when treated with the preparation in solution of different concentrations, while laboratory germination increased by 10-20%. Productivity indicators (the aboveground mass and root system, the number of leaves and their area) were studied when using leaf and root feeding of plants. It was found that the largest plant mass (82.5 g), leaf mass (53.1 g) and their area (806.5 cm2) were obtained by growing lettuce using leaf and root feeding with the 10% preparation solution. The use of leaf dressing alone 1.4-2.2 times increased the lettuce leaves area compared to the control. The biochemical composition of lettuce leaves during the harvesting period showed differences in the dry matter, total sugar, ascorbic acid content. The largest amount of dry matter (10.3%) and vitamin C was the variant with leaf feeding of plants with the 5% preparation solution. The 20% preparation solution, the highest in the experiment, restrained the rate of dry matter, fructose and ascorbic acid accumulation in the production.