To improve the reclamation state of the land, a big role is played by a horizontal horizontal drain, which does not give for raising the level of groundwater and collect salt water during irrigation. For the protection of drainage from destruction and flushing, an important role is played by the compaction of the ground, which inside trench. The article addresses the issue of ground compaction in trenches of closed drains. The article gives the advantages and disadvantages of the existing methods of compaction of ground in trenches of closed drains, the results of a study of methods of compaction of ground in trenches of closed drains showed that backfilling and compaction of the ground is done separately, these operations must be performed simultaneously, this article gives the design of a compaction device that must be performed simultaneously, the basis theory of ground compaction, the results of laboratory research, the results of the study determined: acting ground force on the surface of the sealing blade (F = 12 kN/m 2), the outer diameter of the sealing blade (Dou = 300 mm), the inner diameter of the sealing blade (Din = 600 mm), the coal between the blades (ϕ = 15 … 30°), the rotational speed of the blade shaft (n = 360 tu/min), degree coefficient (Ks = 1,22) of ground compaction, ground density ρg = 1375 kg/m 3).

No abstract

The article describes the construction technology of closed horizontal drainage in irrigated areas, presents the results of theoretical studies to determine the depth of drainage, the width of the drainage trench, the diameter of the drainage pipe, the thickness of the filter material, the distance between the drains and the drainage module. According to the results of theoretical studies, the average drainage depth is 1.5 m, the width of the drainage trench is 0.3 m, the diameter of the drainage pipe is 0.1 m, the thickness of the filtration material is 0.1 m. The distance between the drains is 150 m with the drainage module 0.1 l/s, the distance between drains is 180 m with a drain module of 0.12 l/s, and the distance between drains is 210 m with a drain module of 0.14 l/s.

In this developing world, saving water is the main problem for agricultural sciences. So, in this field, scientists are using many methods to save water-for instance, traditional irrigation, drip irrigation, sprinkler irrigation, sub-irrigation, and others. Solving irrigation and the problems in this article demonstrated the sub-irrigation method for agriculture plants in the Uzbekistan regions. According to watering theory in the field condition and compared to drip irrigation in the region, scientifically experiment was done. According to the results of the study, this method will automate the stability of soil moisture in the irrigation of agricultural crops: save 4 … 5 times water and prevent soil salinization; the cost of processing plants and fuels and lubricants with the help of technical means is sharply reduced; land use coefficient increases; hardening of crop rows and the number of their processing is sharply reduced; it is guaranteed to increase crop yields by mixing the juice with water; environmental pollution and soil salinity are sharply reduced. In the case of drip irrigation of agricultural crops, flexible plastic pipes with a diameter of 16… 20 mm are laid on the soil near the crop stalks, from which water holes or cracks are formed at certain intervals, from which water drips and irrigates crops. It is also possible to mix the juice of chemical and local fertilizers with water.