Calculations are presented to determine the pressure loss in the water supply elements of the installation for washing the drainage, taking into account the used water flow rate, the inner diameter of the washing pipe and its length. Based on the calculations, it is recommended that the installation for washing the drainage UPD-120 be completed with a flushing pipe with an inner diameter of
20 mm and a length of 300 m.

The article justifies the need to develop basic schemes of reclamation systems using polymer pipelines in some cases instead of conducting channels. The developed design of polymer wells-regulators on these pipelines describes.

Basic diagrams of conducting network are based on design solutions of melioration systems taking into account hydrogeological and natural conditions of objects. In the system structures it is proposed to use horizontal drainage together with water dug-out reservoir and settling tanks on discharge pipelines.

The design solutions of the basic diagrams are due to the existing tendency to increase the area of drainage systems, which allows to increase the coefficient of land use.

The article presents the methodology of field surveys and the results of studies of the technical condition of the structural elements of the gateway regulator. Their technical condition, the presence of various kinds of defects and damage are revealed. Recommendations for repair and reconstruction are given.

 As a result of the studies, the advantage of legumes over cereal herbs in the content of crude protein, neutral detergent fiber (NDF) and acid-detergent (ADF) was established. The delay in harvesting perennial herbs, including alfalfa, affects the quality of the green mass due to excessive accumulation of fiber.

The data of structural carbohydrates content in the grasses of sowing alfalfa for 2‒4 years of life cultivated on agro-peat soils of the Belarusian Polesye was presented. It was found that in the dry mass of lucerne the content of neutral detergent fiber, acid-detergent fiber and hemicellulose was in the range of 36,8‒59,3%, 19,7‒36,5% and 16,4‒22,9 %, respectively, depending on the year of use and experience options. The content of non-structural carbohydrates by years of life was 14,8‒38,4%.

The analysis of the influence of the seeding rate on the yield of above-ground biomass in the design of binary grass stands based on Festulolium (Festulolium loliaceum (Hudson) P. V. Fournier)) and alfalfa (Medicago sativa). According to the results of research (2017‒2018), the optimal seeding rate should be considered 3 million germinating Festulolium seeds + 6 million germinating alfalfa seeds, which ensures maximum productivity and share of alfalfa in the herbage up to 63.3 %. As a mathematical tool for evaluating the uniformity of feed intake during the growing season, it is proposed to use the uniformity Index (I), which expresses the ratio of minimum and maximum increases of the aboveground biomass on average over a certain period (I = min/max).

The article presents the results of studies that were conducted in 2017‒2019 in the eastern parts of Mogilev region on the growth, development and yield of sugar beet at different doses of fertilizers during irrigation. One of the factors for increasing the yield of sugar beets is fertilizer, but its reaction to additional irrigation has not been known in Belarus until now. Two doses of fertilizers, N₁₂₀P₉₀K₁₈₀ and N₁₅₀P₁₁₀K₃₀₀, were used in the experiment. For experiments, a zoned variety of sugar beet – singleseeded Belpol was used. Field experiments on sugar beet irrigation were conducted in the Tushkovo experimental field of the Belarusian State Agricultural Academy. The soil is a sod-podzolic light loam, developing on a light pulverized loess-like loam, underlain by a morainic loam from a depth of about 1 m. Maintaining soil moisture level within the boundaries of 60 % HB, 70 % HB, 80 % HB was monitored. Variants were irrigated with a wide-reach Linsday-Europe Omega «Zimmatik» sprinkler. As a result of research, it was found that the greatest impact made on the yield was the lower limit of regulation of 70 % HB against the background of N₁₅₀P₁₁₀K₃₀₀.

Provides information about contemporary area state and degratory peat soils in the Byelorussian Polesie. The territory of the Polesie region includes 36 administrative districts of the Republic of Belarus, including the following regions: Brest ‒ 11, Gomel ‒ 21. Minsk ‒ 3 and Mogilev ‒ 1. From the comparison of the original area of drained peat soils with the current area of degrotorfian soils, it follows that as a result of long-term agricultural use and mineralization, 35 % of the area of drained peat soils in Polesie turned into degrotorfian.