The applied methods of applying fertilizers for cotton in Uzbekistan do not fully ensure the supply of nutrients to the plant's root system. The study aims to substantiate the technological process of uniform distribution of fertilizers in the root development zone and the parameters of coulters. When the fertilizer is distributed in the root development zone in tiers and the right ratio, the coefficient of their use increases, and the yield of cotton increases. The research uses the laws and rules of theoretical mechanics, mathematical statistics, mathematical planning of experiments, and the methods given in existing regulatory documents. The technology of forming new ridges instead of existing ridges and new furrows instead of existing furrows in fields with harvested husk with simultaneous fertilization and an improved chisel cultivator-fertilizer with comb-forming agents for its implementation, as well as the results of theoretical studies to substantiate the main parameters of the tuk coulter chisel-cultivator are presented. The study determined the parameters of universal fertilizer Coulter chisel-cultivator of fertilizer: the base cone of the diffuser in the form of an ellipse with minor axis width 10 mm, height tool provider relative to the upper base of the truncated cone of 60 mm, and a diameter of a half-cylinder of 20 mm.

The study aims to substantiate the design and parameters of the comb-forming device with elastic rods. The basic principles and methods of classical mechanics, mathematical analysis and statistics were used in this study. The authors proposed a comb-forming machine with elastic rods for sowing cotton on the combs. The main parameters of the comb-forming machine with elastic rods and the amount of vertical load on the working body are justified by experimental studies. It is established that with a diameter of 3 mm elastic rod, the number of elastic rods 64 pieces, a radius of 0.3 m disks and a width of 0.60 m device capture provides high-quality destruction of soil lumps and the formation of ridges of the required shape.

The results of the justification of the fertilizer coulter parameters to implement the uniform distribution of fertilizers to a given depth with a belt width are presented. The uniformity of fertilizer distribution over the working width of the fertilizer coulter is mainly influenced by the uniformity of the half-cylinder, which, in turn, depends on the parameters of the feeding part.