The calculation of the hydraulic parameters of the water flow in the drainage pipeline with the hydrodynamic method of cleaning, depending on the water flow rate of the flushing nozzle, the speed of its movement, the diameter and slope of the drainage pipeline, has been carried out. The flow rates and speeds have been determined at various stages of cleaning during the forward and reverse movement of the flushing nozzle.

The results of the theoretical and practical determination of the radio-permeability of the drained peat soil and underlying sand are presented. It was determined that the general trends of the theoretically calculated and measured attenuation of radio signals coincide: with increasing frequency, the absorption of the radio signal increases. The nonlinearity of the addition of attenuation at the transition of soil types is revealed.

The relative error of the methods for calculating the geometric volume of the ditch according to the known formulas is analyzed and an algorithm for calculating the pit by the coordinates of its vertices is proposed (author – A. A. Levitsky). The proportion of earthworks in hydrotechnical engineering is more than 20 % in terms of labor intensity and about 15 % in terms of cost; therefore, it is important to determine the exact geometric volume. The volume of the pit, calculated using the CAD program AutoCAD, was taken as the true value in determining the relative error of the calculation formulas.

The methods of cultivation of alfalfa and meadow clover in the conditions of the Belarusian Poozerie were improved: site selection, selection of precursors, tillage, application of mineral fertilizers and lime materials, timing, methods and seeding rates, care of crops.

It has been established that on peat shallow soil, the use of P₆₀K₂₄₀ (K₁₈₀ for the first grass cutting and K60 for the second grass cutting) under perennial legume-cereal grasses reduces the ¹³⁷Cs content in hay by 2.2–3.0 times. The use of nitrogen fertilizers in total rates from 30 to 90 kg/ha against the background of P₉₀K₁₈₀ reduces the concentration of ¹³⁷Cs in the hay of the first cut by an average of 1.7–2.0 times, in the hay of the second cut by 1.5–1.9 times. On peaty-gley soil, phosphorus and potash fertilizers in rates of P₉₀K₉₀ reduce the transfer of ¹³⁷Cs into perennial grasses of the first cut by 27–28 %. When K₁₂₀ is introduced for the first cut, a decrease in ¹³⁷Cs input from the soil into plants is observed. Top dressing of grasses of the second cut with potassium at a dose of 30 kg/ha against the background of P₉₀K₉₀ provides a 50 % decrease in the coefficient of radionuclide conversion into hay. The introduction of cereal grasses N₆₀ and N₈₀ for the first cut does not significantly increase the ¹³⁷Cs intake into plants. The second nitrogen fertilization of grasses leads to a slight increase in the accumulation of ¹³⁷Cs in the hay of the grasses of the second cut. The intake of ¹³⁷Cs in hay at increased doses of nitrogen fertilizers (N_120‒140) decreases against a high background of potassium use.

The productivity of alfalfa and meadow clover in singlespecial, mixed with each other and with meadow fescue, as well as in single-species, undercover and field pea crops was studied on a cohesive sandy soil with a high content of humus, phosphorus and potassium in the central part of Belarus in 2018–2020. It is established that the cultivation of alfalfa in its pure form or with underseeding of meadow clover provides not only high productivity, but also the best economic indicators. Meadow clover shows high effectiveness only with two-year cultivation and sowing in pure form with a seeding rate of 4 million germinating seeds per 1 ha.

In the 500-year history of land reclamation in Belarus, a special place is occupied by the Western Expedition to drain bogs (1872–1902), that was headed by General I. I. Zhilinsky. In terms of duration, it has no analogues. During its activity, 3.25 million hectares were canalized, including 410 thousand hectares of swamps turned into meadows, 120 thousand hectares of arable land, 615 thousand hectares of mature forests using canals for timber rafting close to rivers. During the entire period of the Western Expedition's work, The project of draining the Polesie bogs in 1878. At the World Exhibition in Paris, he was awarded an Honorary Diploma, and the head of the Western Expedition was awarded a Gold Medal. It was attended by leading scientists from various scientific fields, that created the theoretical basis for the reclamation of bogs in the Belarusian Polesie, as well as in Russia and Ukraine. Looking into the future, I. I. Zhilinsky wrote, that work in Polesie is sufficient under the economic conditions typical of the late XIXth century «as the population increases and the culture of the country rises, there will be an inevitable need to gradually expand and supplement the existing network of channels».

In the 500-year history of land reclamation in Belarus, a special place is occupied by the Western Expedition to drain bogs (1872–1902), that was headed by General I. I. Zhilinsky. In terms of duration, it has no analogues. During its activity, 3.25 million hectares were canalized, including 410 thousand hectares of swamps turned into meadows, 120 thousand hectares of arable land, 615 thousand hectares of mature forests using canals for timber rafting close to rivers. During the entire period of the Western Expedition's work, The project of draining the Polesie bogs in 1878. At the World Exhibition in Paris, he was awarded an Honorary Diploma, and the head of the Western Expedition was awarded a Gold Medal. It was attended by leading scientists from various scientific fields, that created the theoretical basis for the reclamation of bogs in the Belarusian Polesie, as well as in Russia and Ukraine. Looking into the future, I. I. Zhilinsky wrote, that work in Polesie is sufficient under the economic conditions typical of the late XIXth century «as the population increases and the culture of the country rises, there will be an inevitable need to gradually expand and supplement the existing network of channels».