The article presents the results of studies on the effect of active ventilation systems of the 3rd-4th and 5th technological modes on the keeping quality of seed potato tubers. It has been established that the keeping quality of seed potato tubers is a varietal feature that changes under the influence of storage conditions.

Three-year studies on the associated soil of the central part of Belarus have established that the largest collection of dry matter hybrids FAO 210 form when sowing in the first decade of May and the density of standing plants is 110–130 thousand/ha. For FAO 230 hybrids, the sowing period is also optimal in early May with a plant standing density of 90 to 130 thousand/ha. FAO 250 hybrids form a greater yield with early sowing and stem density – 70–110 thousand/ha. Harvesting corn for two weeks after the beginning of waxy ripeness of the grain does not lead to a decrease in the yield of dry matter, and even slightly increases it. Together with the cultivation of hybrids of different ripeness (FAO 210–250), this makes it possible to extend the harvesting of corn for silage in the optimal phase of its development, and with an increase in yield, for one month.

According to the results of studies in 2019–2021, the influence of sowing dates and standing density on the duration of interphase periods and the height of maize hybrids of various ripeness groups (FAO 210–250) has been shown. It was revealed that the thickening of plants from 70 to 130 thousand units /ha at the early stage of intensive growth led to an increase in height by an average of 5.9 %, but by the end of plant growth, their height did not differ significantly. Among the ripeness groups, the plants of the hybrid DN Galatea (FAO 250) were the highest.

The results of the study of soil protection efficiency and productivity of crop rotations are presented. It has been established that on medium and highly eroded soils, grain and grain-grass crop rotations with soil-protective capacity indicators of 0,54–0,72 do not prevent soil erosion to the maximum allowable level. In grass-grain crop rotations, the residual washout on moderately eroded soils is lower than the permissible washout, and on highly eroded soils it is 1,5 times higher. The annual shortage of products in crop rotations is 2,0– 5,2 c/hа on slightly eroded soils, 2,5–15,7 c/hа on moderately eroded soils, and 10,7–25,5 c/hа on highly eroded soils units The highest yield of fodder units is provided by grass-grain crop rotations with alfalfa.

The introduction of liquid complex fertilizers recommended for oilseed flax, together with a dose of mineral nitrogen N20 in the top dressing in the «herringbone» phase increased the yield of oilseeds, depending on the treatment option, by 0,6–1,3 c/ha or 3,7–8,2 %, oil collection – by 0,3–0,7 c/ha or 4,6–10,9 % compared to the background, where mineral nitrogen was introduced only for pre-sowing cultivation. Optimal conditions of the growing season provided an increase in the yield of oilseed flax seeds by another 10 %, and the oil harvest – by 16,6 %. The use of boron and zinc together with nitrogensulfur-containing and nitrogen-potassium liquid fertilizers and nitrogen as a foliar top dressing of oilseed flax additionally increases seed yield and oil harvest to 0,2 c/ha.

Environment conditions determinate selection direction in a breeding process. Therefore, the choice of oat genotypes is of crucial importance. They should provide high stable seed yield of necessary quality both at changes of vegetative period conditions and at different intensity levels of crop cultivation technology. The results of breeding evaluation at the stage of the competitive variety trial of new oat variety Reverans by the parameters of adaptivity, stability and ecological plasticity are presented in the article. The developed variety is characterized by the best values of the mentioned parameters (CA = 1,07; bi = 1,17; S2di = 3,94) among the studied samples and the check variety. Variety Lux successfully underwent the State Variety Testing and since 2022 it was included into the State Register of Varieties Authorized for Use in the Republic of Belarus.

It is revealed, that Galerucella viburni Payk. is the dominant pest among Coleoptera in viburnum plantings in Belarus. Among entomophages Himacerus apterus F. from the family Nabidae and the predatory mites from the family Phytoseiidae predominate in the crop plantings. In chokeberries crops among Coleoptera Anthonomus conspersus Desb. has dominated, during the years of research the inflorescence damage ranged from 1,2 to 5,5 %. The efficiency of the application of the biological product “Melobass”, developed on the basis of the fungus Beauveria bassiana, against viburnum leaf beetle and rowan weevil reaches 51,2–47,5 %.

The article presents the results of faunistic studies in sorghum agrocenoses for 2020–2022. The species composition and distribution by regions of the country have been clarified, the dynamics of the number of major pests during the growing season in conjunction with the ontogenesis of a fodder plant has been studied, the impact on the harmfulness of phytophage insects of the main techniques of crop cultivation (sowing dates, varieties (hybrids)) in order to increase yield and product quality. The greatest damage to sorghum Ostrinia nubilalis Hbn. (5–46 %) and population of the Aphidiidae culture (1–96,5 %).

The paper substantiates the expediency of presowing fractionation of fiber flax seeds. The size of the fractions and their influence on the sowing characteristics, chemical and biochemical properties of the seed material for the formation of a monomorphic highly productive cenosis have been established. A direct proportional relationship was established between the volumetric weight of seeds and their mass (R2 = 0,98), germination (R2 = 0,94), sowing suitability (R2 = 0,94) and an inverse relationship with their infection with diseases (R2 = 0,93). A decrease in the volumetric weight of seeds reduces the content of nitrogen and crude protein in the seeds, and increases the content of crude fiber.

The article gives an assessment of the gherkin cucumber by quantitative characteristics and identifies hybrids that are distinguished by the best combination of elements that determine the yield structure. Strong direct correlations were established between plant height and leaf area (R = 0,678), as well as weak inverse correlations between plant height and fruit length (R = –0,023). The coefficients of determination are calculated, which make it possible to determine the dependence of one attribute on another.

The results of the study of electrophoregrams of the main fractions of protein compounds of vegetable pea microgreens under the intensity of LED illumination of 50, 100, 150, 200 and 250 μm/m2 sec, which revealed a clearly pronounced heterogeneity of their composition with the presence of components with different molecular weights and the absence of a significant effect of the studied factor on quantitative and qualitative characteristics of the profiles of albumins, globulins and glutamines in the presence of dependence on it of protein profiles of prolamins. It was shown that the most favorable conditions for the creation of total protein reserves in pea microgreens were provided by the intensity of LED illumination equal to 50 and to a greater extent 100 µm/m2 sec, while the most efficient production of soluble components of the protein complex proceeded only at its intensity of 200 µm/m2 sec.