Relevance. LED sources of plant irradiation, surpassing the level of sodium light sources in terms of energy efficiency, are superior to them in terms of the possibility of optimizing spectral characteristics. Therefore, the issue of wider use of LED light sources when growing plants under light culture conditions is relevant. Possessing significantly greater efficiency compared to high-pressure sodium lamps, LEDs are of great interest to greenhouse growers. However, the successful application of these new light sources requires new approaches. And the main thing is that LED sources of plant irradiation cannot be widely used without changing the technology for growing vegetable crops in protected soil, without introducing new, specially created hybrids. And direct replacement of sodium light sources with LEDs does not make sense.Methods. The studies were carried out in a modern greenhouse under controlled conditions of real light culture while growing a medium-fruited tomato F1 Bountis (DRS). The area of the registration plot was 326 m2. For phenological observations and crop recording, areas with the same number of plants were allocated in the center of the recording plot, leaving protective strips in one row of plants along the edges. The installed lighting power is 200 W/m2. The light source was high-pressure sodium lamps DNaZ/Reflux 600W 400V with a ZhSP25 Reflux lamp with electronic ballasts, as well as a LED greenhouse lamp 680W 400V.Results. When using a hybrid system, the total illumination in the PAR region is 40% higher compared to a sodium lighting system, and it would be expected that the yield of the tomato crop will change accordingly. In general, over the entire period of the experiment, the yield under hybrid lighting conditions was higher by only 3 kg/m2 or 5.5% and amounted to 58.3 kg/m2, and under the sodium system – 55.2 kg/m2. At the same time, under the conditions of the hybrid lighting system, plant growth was slightly behind the control: the length of the main stem was by 15%, the number of established leaves and their average length by 3%, the number of formed inflorescences by 5%, and the thickness of the leaf blade by 20%.Conclusion. An increase in light does not always lead to a similar increase in yield. Not just light is important for plants, it is important to correctly assess its productivity and spectral composition. The problem of assessing illumination taking into account the real interaction of light with the plant exists and must be solved.

The collection of winter garlic from Yekaterinburg was transferred to the Federal Agrarian Research Center of the Republic of Dagestan. The Ekaterinburg collection contained specimens of Dagestan origin; when transferred to Dagestan, it was significantly expanded with local forms. Total studied in 2021-2022 60 samples, all of them belong to the group of autumn shooters.According to the average mass of bulbs over 20 g, seven samples were distinguished: 1-4-3, 1-20-2, 1-20-3, 1-21-3, 1-21-4, 2-5-3, 2-9-2. They also noted the largest masses of bulbs – 25,8- 30,4 g, the coefficient of variation did not exceed 33%. For reproduction by air bulbs, taking into account their number and weight of the bulb, out of seven samples marked by the mass of the bulb, three were distinguished: 1-4-3, 1-21-4 and 2-9-2, the indicators exceed the average values. According to the maximum mass of an air bulb (150 mg), sample 1-22-2 stood out, but this sample had an average bulb weight of 13,9 g. Sample 2-13-1 also exceeded the average values for the number of bulbs and bulb mass, but it had an average bulbs less than 20 g and a coefficient of variation of 41%. The results of studying the collection of Dagestan origin showed that the samples represented a complex population with high differentiation in bulb mass and inflorescence characteristics, which made it possible to isolate the source material using individual selection. According to the average mass of bulbs, samples 1-4-3, 1-20-2, 1-20-3, 1-21-3, 1-21-4, 2-5-3, 2-9-2 were distinguished, of which for propagation by air bulbs –samples 1-4-3, 1-21-4 and 2-9-2.

Garlic is exclusively vegetatively propagated plant which damaged by numerous virus, bacterial, fungus and other phytopathogens. Under propagation of damaged plants phytopathogens are transferred to progeny that leads to decrease in productivity, loss of quality, storability and frequently to degeneration of cultivars. In this regard improvement of landing material is obligate stage of the modern technologies of garlic production. Experimentally reasonable technology of the obtaining revitalized landing material of winter garlic based on in vitro cultivation of air bulbils on MS medium containing BA in concentration of 2 mg/l and NAA – 1 mg/l, which followed by formation of sprouts and then plants with bulbs is presented in the article. It is established that application of graduated sterilization of air bulbils isolated from not revealed inflorescences with diameter up to 25 mm for introduction in vitro culture allows to obtain plants free of internal infections. One of important factors influencing effectiveness of induction of morphogenesis is the plant genotype. Cultivar Emperor was characterized by high morphogenetic potential in vitro culture which significantly surpassed cultivar Gladiator at all stages of cultivation. The share of vital explants of Emperor cultivar consisted of 74,2%, and Gladiator cultivar – 56,3%. The morphogenesis of air bulbils in vitro conditions depends on their age. The share of vital micro bulbs with leaves formed under cultivation of air bulbils within 21 days isolated on 7th day after of exit of inflorescences from leaf sockets in depending on cultivar consisted of 65,0% and 76,4%. Cultivation of air bulbils of more old age is followed by their 100% growth with formation of leaves and microbulbs. Adaptation of such plants to ex vitro conditions is followed by obtaining monoclove bulbs cultivation of which in the open ground conditions leaded to formation of polyclove bulbs.Cultivation of plants in vitro on the medium containing sucrose in concentration of 10% gives the chance to keep viability material within 5-6 months.

Relevanc and methods. The article presents the research results on the introduction of artichoke in Uzbekistan. In the process of research, some issues of artichoke seed production in the conditions of dry subtropics of Uzbekistan were also studied. Studies were carried out on the Krasavets cultivar. When identifying the most effective method for forming a seed bush, the comparison of growing seed plants without formation and 4 methods of formation was compared: 1 stalk on a plant and 3 inflorescences on a stalk, 2 stems on a plant and three inflorescences on each, 3 stems on a plant and three inflorescences on each, 4 stems on the plant and three inflorescences on each. Results.It was revealed that artichoke plants grow and develop, form full-fledged seeds during the growing season. The manifestation of morphobiological and economically valuable traits largely depends on the age of the plants. A significant reduction in the growing season, an increase in the height of plants and the number of stems, an increase in the average mass and number of inflorescences and, ultimately, yield occurs in the second year of plant life. It was also revealed that the potential productivity of artichoke plants in Uzbekistan is very high. The yield of the Krasavets cultivar in the second year of life is 55.5 t/ha, and that of the Green Globe cultivar is 39.2 t/ha. This is significantly higher than the global average. The highest seed productivity was noted in the variant without the formation of a seed plant: 734.2 g/plant or 15789 seeds/plant. However, in such indicators as the mass and number of seeds from one inflorescence, the mass of 1000 seeds of a plant without formation is significantly inferior to other options. Based on the results of experiment 3, 4, 5, the options can be considered appropriate to use in artichoke seed production.