The paper presents the results of the research on new recognized varieties of spring rape in the competitive variety trial for 2014–2020. It’s identified that the following varieties have the highest plasticity and stability of oilseed yield: Gertsog (yield stability indicator of a variety = 135,1; stability index = 2,97), Veras (yield stability indicator of a variety = 127,7; stability index = 2,66) and Yarovit (yield stability indicator of a variety = 121,4;stability index = 2,56) with the lowest coefficient of variation as regards the years of the research (V = 13,2 %, 15,2 и 15,6 %). These varieties will have an advantage understressful conditions when cultivated in production. A positive high correlation between the yield and weight of 1000 seeds (r = 0,52) of the varieties studied in 2014 is shown. In 2017 and 2020 amediumcorrelation (r = 0,54 and 0,38) wasobserved.

Carried out correlation analysis of determination the early maturity of hybrids by number of FAO when growing corn in the central zone of Belarus according to the numbers of days from germination to flowering of a cob of corn and leaves on one plant, dry matter content in the plant and moisture in grain during harvesting. It is shown that the last two indicators give a more accurate result regardless of the weather conditions of the year. A discrepancy was found in the value of the number of FAO assigned by the originators of hybrids, so for an adequate assessment of precocity, this should be done in the field of commercial production. Depending on the intended use, a hybrid can have a different the number of FAO, especially in relation to hybrids with a low proportion of grain in the dry matter yield.

The article provides information on the results of the production test of sugar beet hybrids in the “Experienced Scientific Station on Sugar Beet” for 2020. An estimate is given on the yield, sugar content and sugar output of hybrids of different seed suppliers to the Republic of Belarus in the context of the NZ, Z and N/NE genotypes.

An analysis of the results of three-year field experience data on the assessment of yield and sugar collection during the cultivation of sugar beets with irrigation and different doses of fertilizer showed that the maximum yield was observed on the option with the lower limit of soil moisture regulation of 70 % HB and the yield increase on this option was maximum and fluctuated in within the range from 39,6 to 42,3 t/ha in relation to the control. Sugar content in the years of research varied within 15,6–17,4 % in 2017, from 17,6 to 18,2 % in 2018 and from 16,6 to 18,3 % in 2019.

The article presents the results of research on the use of complex fertilizers with microelements in the cultivation of table beets. It was found that the pre-sowing application of a 13:12:19 brand complex fertilizerwith boron and manganese, as well as foliar top dressing with Agricola vegeta aqua liquid complex fertilizer and Leafdrip water-soluble complex fertilizer, can significantly increase the productivity of beet root crops and their quality.

The paper presents the results of a study on the effect of phosphorus fertilization on the fiber content in the trust and the yield of products when cultivating flax on sod-podzolic sandy loam soil. With the content of mobile phosphates in the arable layer of 160–165 mg/kg of soil, the optimal dose of phosphorus fertilizer was set at 30 kg/ha, which ensured seed yield 7,0 c/ha, trusts – 45,6, fiber – 13,8, including long – 8,2 c/ha, profitability of production – 43 %. In the total removal of phosphorus by the flax crop, the proportion of phosphorus fertilizer is 5–6 %, and 94–95 % of phosphorus is consumed by flax from the soil.

Based on the analysis of fundamental carried out with the nitrogen¹⁵ isotope results and the applied researches, the conclusion has been done on the expediency of split rates and forms of nitrogenousfertilizersfor agricultural crop use in the main application and in additional feeding considering the results of soil and vegetative diagnostics for nitrogen content. Such technologies of nitrogenous fertilizers application are stated in the author’s monograph:”Innovative technologies of nitrogenous fertilizers application: theory, methodology, practice”, Minsk, 2020.

The data on the effectiveness of desiccants Reglon forte, AS (3,0–3,75 l/ha), Sukhovey, AS (4,0–5,0 l/ha) and Sprut extra, AS (1,4–2,0 l/ha) in fodder beans crops are presented in the article. Their use contributes to a more uniform grain moisture content of fodder beans: in lower layer fruits – for 1,7–2,1 %, the middle layer – for 2,4–3,1 %, the upper layer – for 3,4–3,8 %, as well as an increase in laboratory germination for 3,5–4,3  %, 3,2–3,6 and 3,4– 3,5  %, respectively, compared with the variant without desiccation. Under the excessive moisture conditions during the inter-phase period «fruit formation – grain ripening» the desiccants application has made it possible to save reliably 4,0–4,9 cwt of grain/ha, while during the dry period this parameter has made 2,3–2,6 cwt/ha.

The results of researches on studying the biological and economic efficiency of one-component and combined preparations applied by pre-planting tuber treatment method are presented. It is shown that the studied seed dressers decrease black scab development, render the influence on germination, plant height, the average stems number per bush and facilitate potato yield keeping up to 11,1 %.

Winter wheat occupies a leading place in Ukraine among all grain crops. The influence of various doses and ratios of mineral fertilizers against the background of manure and periodic liming on the appearance and development of septoria leaves on winter wheat is shown. During the years of research, the development of the disease, depending on the elements of agricultural technology, averaged 2,5–7,0 % in the tube emergence phase, 5,5–12,5 % at earing, and 16,0– 29,5 % at milk ripeness.
In comparison with the unfertilized control, the development of leaf septoria when applied to winter wheat with N₃₀P₄₅K₄₅ against the background of 10 t/ha manure + CaCO₃ 1,0 norm by hydrolytic acidity was 1,4 times lower, and with N₁₂₀P₁₃₅K₁₃₅ against the background of 10 t/ha manure + CaCO₃ 1,0 norm by hydrolytic acidity – 1,2 times higher.

The article presents the results of studying the phytopathological state of pomegranate plantations in order to develop scientifically based effective measures to protect plants from diseases.
In the conditions of the western part of Azerbaijan, 20 species of fungi were found on pomegranate, affecting roots, trunks, leaves, flowers and fruits. It has been established that the most common zithia fruit rot of pomegranate (Zythia versoniana Sacc.). Experimental data on the effectiveness of fungicidal protection of a crop against disease are presented.
The need for a reasonable combination of various methods of plant protection when growing pomegranates is indicated.

The article presents two-year research data on assessing the effect of budding height and planting depth of trees on the yield of Gastsinets sweet cherry on VSL‑2 clonal rootstock. It was found that the yield during the period of full fruiting of the garden (at 11–12 years after planting) at the level 24,0–30,4 t/ha was obtained in variants with budding height 20 and 60 cm, regardless of the depth of the rootstock of the seedlings when planting in the garden. The yield of fruits of the first commercial grade for the years of research was 98 %.

The article presents the results of molecular analysis for the identification of varieties of winter garlic, selected from different regions and regions of Belarus. We used 17 microsatellite loci to identify genetic polymorphism among 54 selection samples of winter garlic (Allium sativum L.). As a result of amplification with microsatellite loci, 115 alleles were obtained, with an average of 6,7 alleles per locus. Based on the results of the study, genetic diversity was revealed between the accessions, which were distributed over 10 clusters. Differences in the genotype of winter garlic were revealed both between the cultivars and the points at which the selection was carried out.

The article presents the economic efficiency of doses of mineral fertilizers when applied against various backgrounds of the action and aftereffect of organic fertilizers under drip irrigation when growing garlic on sod-podzolic sandy loam soil. An economic assessment is given, including full cost, profit, profitability of 1 ton ofsold products. The data on doses and backgrounds of average payback of 1 kg of NPK by garlic production are presented. Calculated deviations from the minimum value for the option of manufactured products per 1 kg of NPK. The economically efficient humate-containing types and doses of fertilizers for growing domestic varieties of garlic have been determined.

The article presents the results of studies of the effect of magnetic fields of permanent ferrite magnets on changing the properties of water. The effect of the duration of magnetic effects and the peculiarities of the application of the particraging effects on the change in water conductivity is revealed. With different embodiments of magnetic treatments, the indicator on average decreased by 21,4 μs/cm. The maximum decrease in electrical conductivity of 32,9 μs/cm is marked in an embodiment using two magnets at the bottom of the metal tank and the location of the N up pole. The electrical conductivity indicator characterizes changes in the properties of water and reflects its potential activity in stimulating plants.