The comparative test of experimental F1 tomato hybrids was conducted under conditions of two different types of low-volume technology (MPVI "Fitopiramida", technology of growing in mats with drip irrigation) in 2021. The conducted researches have shown that duration of interphase periods, level of yield and fruit quality depend on cultivation technology. According to the data obtained, in conditions of MPVI "Fitopiramida" all studied F1 tomato hybrids enter fruiting faster and provide higher yield compared to the technology of growing in mats, but are inferior in average fruit weight, soluble dry matter content and taste qualities. As perspective F1 tomato hybrids for "Fitopiramida" technology hybrids Ga62(2) and Ga21, submitted for registration to Gossortcommission, were identified. On low-volume technology in mats hybrid Ga27a showed the best result. A strong correlation was found between estimates of the signs "average fruit weight" (r = 0,93) and "soluble dry matter content" (r = 0,81). It is possible to conduct preliminary selections in conditions of low-volume technology in mats according to these signs. For the most reliable assessment and accurate selection of the most perspective tomato hybrids for "Fitopiramida" technology their testing on hydroponic installations is required.

Relevance. Potato varieties Eurasia and Onezhskiy were developed as a result of cooperation between the Murmansk State Agricultural Experiment Station – branch of the VIR and the Leningrad Scientific Research Institute of Agriculture "Belogorka" and were included in the State Register of the Russian Federation in 2014 (Onezhsky) and in 2017 (Eurasia). To determine the prospects for cultivation in the Kola North, the varieties were tested in the conditions of the Murmansk region.Materials and methods. The research was carried out on the experimental field of the Murmansk State Agricultural Experiment Station – branch of the VIR in 2018-2020. Potato varieties Eurasia and Onezhskiy were obtained from the Leningrad Research Institute of Agriculture "Belogorka". The plot in the experiment included 4 rows of 15 tubers in each row. The planting pattern is 70x35 cm. Repetition – four times. The location of the plots is systematic with the plots being shifted along tiers. Early maturity was assessed using one test coping on the 70th day after planting. The Elizabeth variety was used as a standard. The results were processed using the method of analysis of variance according to Dospekhov.Results. The research results showed that the Onezhsky variety is distinguished by high starchiness, non-darkening flesh and good taste, is resistant to pathogens: Synchytrium endobioticum (Schilbersky) Percival, Streptomyces scabies (Thaxter), Globodera rostochiensis (Wollenweber) Behrens, relatively resistant to Phytophthora infestans (Mont . De Bary), is weakly affected by Potato virus Y (PVY), Potato leaf roll virus (PLRV). The Onezhsky variety, on average, over three years of research exceeded the standard sample in terms of yield and plant productivity. The Eurasia variety has high starchy content, good taste, culinary type B, is resistant to pathogens: Potato virus Y (PVY), Potato leaf roll virus (PLRV), Globodera rostochiensis (Wollenweber) Behrens, Synchytrium endobioticum (Schilbersky) Percival, moderately susceptible to Phytophthora infestans (Mont. De Bary). The Eurasia variety also exceeded the standard sample in terms of yield and plant productivity. Thus, the Onezhsky and Eurasia potato varieties are recommended for cultivation in the Kola North.

Relevance. The effectiveness of seed soaking before sowing in a solution of preparations of the epibrassinolide group for the protection and preservation of seedlings of gourds from temperature stresses, increasing the yield of fruits and seeds was studied.Methodology. The objects of research were preparations Epin Extra, Epin Plus, EcoFus, Ferovit, Zircon and Siliplant, which allow to overcome the effects of temperature stresses, increase immunity, and have a stimulating effect on seed germination and plant growth of vegetable crops.Results. In the course of the studies, it was found that preparations of the epibrassinolide group contribute to a significant preservation of seedlings of gourds with prolonged exposure to low temperatures. Soaking watermelon seeds of the Tersky early variety before sowing in a solution of drugs from the epibrassinolide group ensured the safety of seedlings from 24.2 to 35.3%, while in the control variant, the death of plants was 100%. Epin Extra had the greatest anti-stress effect on watermelon. Preparations on melon showed less efficiency in protecting seedlings, 21.1-27.3% of plants survived. The maximum number of seedlings remained when using Epin Plus. It should be noted that soaking seeds in solutions of preparations of the epibrassinolide group, to protect seedlings of gourds from damage by low temperatures, is an effective technological operation that makes it possible to smooth out the impact of the stress factor.

This review presents an analysis of the literature, which indicates the popularity of breeding methods in the fight against oomycete and fungal diseases of tomato: late blight (pathogen − Phytophthora infestans (Mont.) de Bary), fusarium wilt (pathogen − Fusarium oxysporum f. sp. lycopersici (Sacc.) Snyder and Hansen), early blight or alternariosis (pathogens − representatives of the genus Alternaria), cladosporiosis (pathogen−Cladosporium fulvum Cook.). Theoretical and practical achievements, the latest developments in genetics, molecular biology, plant physiology, microbiology are considered. Special attention is paid to modern information about the diversity of tomato pathogens, their morphological, genetic, physiological features, including racial composition; the presence of pathogen resistance genes in the gene pool of the culture under study, their mapping and the possibility of introduction into the genome from other sources; about the developed markers of target genes and loci of quantitative traits; the degree of associations between a molecular marker and a target gene; about the features of inheritance of the studied trait, as well as the possibility of pyramiding R-genes and QTL in one genotype. To accelerate and improve the efficiency of tomato breeding for resistance to pathogens, these issues are of great importance. Their study will strengthen the integration of modern biotechnology with the traditional breeding process, which is carried out by classical methods.

Relevance and methodology. In order to determine the effect of increasing the proportion of far red light (different ratio of red and far red light) in the total spectrum of polychrome irradiation on the growth rates of sugar beet plants of the Smena hybrid, they were grown for 82 days under LED lighting under controlled climate conditions in a Synergotron digital device of the ISR 2.01 model with a twofold increase in the proportion of far red light compared to control.Results. An increase in the proportion of far red light led to an increase in the specific weight of leaves with a smaller area of leaves in the initial period of plant growth, higher values of the quantum yield of photosynthesis, the rate of electron transport, and a decrease in energy losses mainly to heat. The biometric indicators of plants changed depending on the period of ontogeny. In the initial period, the biomass of the aerial part prevailed, in the subsequent period, the biomass of root crops. In the experimental variant, the accumulation of biomass in the aerial parts of plants in the initial period of the experiment turned out to be less than in the control, and only at the end of the experiment was an excess of the total biomass in the experimental variant by 12.2%. There was an increase in the accumulation of root biomass compared to the control by 38.7%. The predominant part of the aboveground biomass of sugar beet was made up of leaf blades, the proportion of petioles was much less and practically did not depend on the composition of the light. At the end of the growing period, the dry matter content in root crops increased by 2.44% compared to the control, sugar content – by 0.65%. The data obtained can be used in the development of technology for artificial lighting of sugar beets when grown in closed agrobiotechnosystems in order to increase the yield and sugar content of root crops.

Relevance. Alternaria dauci, Alternaria radicina and Fusarium oxysporumare wide spread and harmful fungal diseases of carrot (Daucus carota L.) in the Russian Federation and in the world. Total losses of roots from these diseases are 35-70%. Obtaining of new varieties and hybrids resistant to these pathogens is complicated by the fact of polygenic control resistance traits to fungal diseases of Alternaria and Fusarium genus. Interaction of polygenic resistance traits with environmental factors causes the soft character of changing these traits: effects of interactions between alleles and genes are changed, the dominant effect become weaker, additive effect become stronger. So, we can say about of the tolerance to complex pathogens for that case.The goal of our study is to determine the heritability of tolerance to fungal pathogens Alternaria dauci and Fusarium oxysporum by hybrids F1 of carrot.Materials and methods. Materials of studies were 7 basic lines with different types of roots; 7 prospective hybrids F1 and mycelium of Alternaria dauci and Fusarium oxysporum with spores (for inoculation). Methods of studies were: evaluation resistance of lines and hybrids F1 (seedlings, adult plants and roots) at different types of infection backgrounds; dispersion and correlation analysis. Resistance the basic lines of carrot to fungi of Alternaria and Fusarium genus was evaluated step-by-step, using several types of artificial and natural infection backhybrids F1. Tolerant samples were selected and they were used in crossings. F1 – hybrids have been obtained and they have been evaluated at artificial and natural backgrounds.Results: 1. One tolerant male form № 1268 and 6 female forms with weak sensitivity to fungi of Alternaria and Fusarium genus were selected from basic material. They were used in crossings. hybrids F1 have been obtained. 2. Analysis the heritability of carrot resistance to fungal pathogens Alternaria dauci and Fusarium oxysporum identified, that such type of resistance inherited by father’s type. 3. Using tolerant carrot line № 1268 in crossings as the male form and 6 female forms with weak sensitivity to fungal pathogens Alternaria dauci and Fusarium oxysporum increased significantly the percent of tolerant plant in 3 F1 – hybrid population under artificial infection on provocative infection background.

Relevance. An important proviso for the commercially effective cultivation of vegetable crops in different types of greenhouses is high yield, which significantly depends on modern cultivars with different characteristics and properties. When creating a new cultivar, it is necessary to present its model in accordance with the expected ecological and agrotechnical conditions of planting, the purpose of use, the level of manifestation of morphological and biochemical characteristics, which together will ensure a high yield. The goal of research – to create early ripening, high-yielding cultivars of sweet pepper with high taste assessment of fresh fruits and content of biologically valuable substances.Materials and methods. The studies were conducted in 2015-2018 and 2020-2021 in the Belarusian State Agricultural Academy. The objects were 46 breeding lines of sweet pepper. An evaluation of fruits and plants morphological characteristics, yield traits, fruits biochemical composition, and tasting were carried out.Results. Valuable lines for breeding were selected with a gross yield of 5.60–6.71 kg/m2, with large fruits (150–220 g), thick pericarp (>7 mm),with a high content of biologically valuable substances and fruit quality 4.3–4.7 points. Lines with a complex of economically valuable traits including high tasting score, were transferred to the State Inspection for Testing and Protection of Plant Varieties and recommended for commercial use in the Republic of Belarus under the names Altyn, Chervonets, Karat, Goretsky Krasny, Garlachyk Zhovty and Chyrvony Magnat.

Relevance. In one of the farms, situated in the Central region of the Russian Federation was found the first defeat of cabbage by obligate weed – broomrape. As the long experience shows (since 2011 yr.), the control of broomrape is very difficult, and it is a real danger for the vegetable growing in this region.Materials and methods. The object of researches were the plantations of white cabbage, which was grown by using the cassette technology, there were field experiments.The research methods included the following works: phenological observations of broomrape and white cabbage ontogenesis, the detection of the main features during blooming and fruiting of this weed, the definition of the duration of broomrape evolution until the fruiting phase, the detection of blooming shoots location on the surface of the cabbage plantation, the identifying of relationship between the height of broomrape’s flower-bearing shoots and the height of leaves of cabbage’s rosette.There was analyzed the feature of growing by using the cassette technology cabbage, being damaged by broomrape.Results. It was found, that the studied in the paper race of broomrape can successfully progress in more northern soil-climatic conditions of the Central region of the Russian Federation. The complex of agro technical methods of broomrape control is suggested, it includes: the two-level plowing of the weedy fields right after harvesting cabbage; receiving of cabbage’s fibrous root, which should be situated into the working plowing space with depth up to 25 cm; multiplex cultivation of the growing shoots of the weed; the cabbage hilling before rows closing. The alternative methods of broomrape control also can be used: the conveyer of cruciferous vegetable cultures with short vegetation period and cultures, which provoke the germination of the weed.

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.

Relevance. This article shows the research conducted by researchers from the agrotechnical department of the Bykovskaya melon breeding station from 2018 to 2020.Results. The data obtained make it possible to scientifically substantiate the most cost-effective methods and techniques for treating table watermelon plants to increase productivity in the Volgograd Trans-Volga region. Indicators of economic efficiency of production make it possible to compare the results of economic activity and reveal the productivity of the enterprise for this period in connection with an increase in the use of means of production and labor. In modern conditions of development of agricultural production, there is a need to develop new technologies adapted to the new conditions of land use. In connection with the sharp decline in recent years in the use of fertilizers, the problem arose of finding ways to maximize the use of the biological factor. To obtain stable yields, it is necessary to increase the adaptive capabilities of plants to extreme conditions in which gourds are grown in the zone of industrial melon growing in the Volgograd Trans-Volga region. One of them is the use of plant growth regulators and water-soluble fertilizers. One of the advantages of these drugs is their simplicity, variety of methods of their application and low cost. According to the cost-effectiveness data, it can be seen that the foliar treatment of table watermelon plants was the best option. In the first experiment, the Fitozont regulator, in the second, the water-soluble fertilizer Khakafos with one and a half norm (0.9), in the third experiment, the best results were shown by the variant with foliar treatment with a growth regulator in combination with the water-soluble fertilizer Vigor Forte + Agrovin Profi at a dosage of (0.05+0.5).