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In countries where sericulture is well-developed, there is a pressing need to create new systems, varieties, and hybrids of the Morus alba L. species, which is the only food source for the mulberry silkworm Bombyx mori L. These new systems should be suitable for the care of silkworms, and their nutritional and chemical composition should be studied. The introduction of these new systems into production is considered a crucial problem that needs to be addressed. Research experiments were carried out in 2013-2017 at the Tashkent State Agrarian University and the Silk Research Institute. The results showed that in 2017, the new varieties contained 75.1-74.3% water, while in 2018, the water content was 76.0-77.3%. Meanwhile, the Tajikskaya bezsemyannaya variety showed an increase in this indicator, reaching 75.2-76.2%. However, these results were still lower than the benchmark of 98.8-101.4%. The amount of protein is one of the most important indicators of mulberry leaf composition.

We dealt with the study of the ability of different varieties of cherries, cherries and vegetatively propagated rootstocks to reproduce by green cutting explants in artificial substrates in buildings with a controlled microclimate inside. As varieties in the experiment, such varieties of cherries as Shpanka black, Podbelskaya, Shubinka and Lyubskaya, cherries Revershon, Bakhor, and Drogana yellow were used. Of the vegetatively propagated rootstocks, the following were studied: P-1, P-2, P-3, PN, VTS-13, VP-1, ORP-2, ORP-3, VSL-2 (Krymsky 5), SAV-6R. Of the used cherry varieties, the best rooting of green cuttings was possessed by such cherry varieties as Shpanka black, Podbelskaya and Shubinka, with a quality index of cuttings rooting in the substrate of 70.1 to 83.5%. In sweet cherry varieties, this indicator was 2.5 times lower and generally did not exceed 30.2%. Vegetatively propagated rootstocks provided high quality results of rooting of cuttings explants. In almost all of these rootstocks, the rooting rate of green cuttings did not decrease below 72%. The average rooting rate of rootstock cuttings was 85.7%. This indicates that these rootstocks can be used for industrial cultivation of stone fruit seedlings.

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