Abstract
In the conditions of South-Eastern Kazakhstan, a sharp rise in air temperature at the end of March causes rapid drying of the soil surface layer. As a result, soil clods in the upper horizon harden, reaching a strength of 3 MPa or more, and are poorly crumbled by tools with passive working bodies. Consequently, the fractional composition of the soil after spring tillage does not meet agrotechnical requirements for sowing. The time gap between pre-sowing soil preparation and sowing further contributes to soil drying and delays seedling emergence. In addition, some seeds remain on the soil surface.
The proposed seeder provides row spacing of 45, 50, or 60 cm, performs strip milling of the soil in the sowing zone, prepares the seed furrow, and forms a compacted seedbed. Theoretical studies were conducted using classical methods of agricultural mechanics. Design documentation development and testing of the experimental sample were carried out in accordance with approved standards.
The parameters of the milling working bodies of the STV-2.4 combined seeder-miller were substantiated. An experimental prototype was manufactured and subjected to preliminary tests. The actual milling depth corresponded to the set value of 11.3 cm, with a standard deviation of ±1.8 cm and a coefficient of variation of 15.9%. The content of fine soil fraction (<20 mm) reached 84.5%. Seed placement depth was stable, averaging 3.3 cm (±0.63 cm; 19%). The average seeding rate was 4.7 seeds per linear meter at a target of 5 seeds.
01 Introduction
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02 References
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