Determining the parameters of the milling coulter of the sod seeder

The technology of direct sowing of grass seeds into strip-treated turf using seeders equipped with disc cutters, with the introduction of mineral fertilizers, is highly efficient and environmentally friendly. For better milling of a strip of soil, a working element has been developed, at the ends of the hub of which two cut-out disks with lamellar knives mounted on their protrusions are fixed, the use of which ensures better crumbling of the soil, stability of the width and depth of processing of the milled strip in a monolith compared to L-shaped disc knives. For strip sowing of grass seeds into the sod, a milling coulter with bladed knives has been developed. To determine the optimal parameters and modes of operation of the milling coulter with lamellar knives, a three-level Box-Benkin plan for three factors was implemented. Regression models of the developed milling working body are obtained. An increase in the peripheral speed of the knives of the milling working body significantly improves the quality of tillage, regardless of the number of knives. An increase in the number of knives of the milling coulter also causes an increase in the content of soil particles of 0...25 mm, and the transition from two knives to four ensures its increase by 15.6...20.8 %, moreover, the replacement of four knives with six knives - only by 5.8...7.3 %. The minimum energy consumption of the milling working body with six bladed knives is 2.0…2.2 kW, which was obtained at a peripheral speed of the knives of 6.0…6.4 m/s. The maximum content of soil fractions 0…10 mm and 0…25 mm, respectively, 69.8 % and 91.8 %, provides a milling coulter with lamellar knives at their peripheral speed of 8.0…8.4 m/s.