Taking into account the zonal farming systems, the need for a differentiated application of agrotechnical methods is increasingly growing. Soil rolling as a technological operation is used to ensure optimal soil density and structure in accordance with agrotechnical requirements. Due to rolling, the contact of seeds with the soil increases, which contributes to their better nutrition, and as a result, their germination increases. Rolling also speeds up the process of warming up the soil. The function of the roller to accelerate the soil shrinkage is an effective technique when sowing grain crops with simultaneous rolling of the sown row. This technique largely replaces the time factor that needs to be saved in modern resource-saving technologies of agricultural production. In this regard, a deep modernization of the coulter of the narrow-row grain seeder SZU-3.6 was carried out, which consists in developing the design of the coulter with a press roller. This design of the coulter with a roller for soil compacting makes it possible to carry out strip broadcast of grain crop seeds between the disks with simultaneous rolling of the sown strip, which allows increasing the yield. The article presents a scheme of an experimental coulter and the results of research on the mathematical description of a multifactorial experiment in order to optimize the parameters. When planning an experiment, it is important to choose an optimization criterion by which the object under study is evaluated and links the parameters into a mathematical model. As an optimization criterion, the soil density parameter after the roller passes to the depth of seed placement with a combined coulter was chosen. The rational values of the main parameters of the combined coulter roller for sowing grain crops in the conditions of the Republic of Buryatia are substantiated.

Radnaev Daba N., Kalashnikov Sergei Sergeevich, Badmatsyrenov Dygar-Tsyren B., Dambaeva Bairma E.

1. Dzhasheev A. M. Obosnovanie tekhnologicheskih parametrov seyalki dlya zadelyvaniya melkih semyan v pochvu [Justification of the technological parameters of the seeder for embedding small seeds in the soil]. Tekhnika i oborudovanie dlya sela. – Machinery and equipment for the village, 2020; 2: 16–18 (in Russ.).
2. Epifantsev V. V., Osipov Ya. A., Vaitekhovich Yu. A. Soshniki dlya vyrashchivaniya ekologicheski bezopasnoj soi [Coulters for growing environmentally safe soybeans]. Sel'skohozyajstvennye mashiny i tekhnologii. – Agricultural machinery and technology, 2020; 3: 59–65 (in Russ.).
3. Kobyakov I. D., Shevchenko A. P., Evchenko A. V. Zernovaya seyalka dlya polosnogo poseva [Grain seeder for strip sowing]. Sel'skij mekhanizator. – Rural machine operator, 2019; 12: 12 (in Russ.).
4. Ovtov V. A., Abrosimov M. Yu. Soshnik dlya poseva dlya melkosemennyh kul'tur [Coulter for sowing for small-seeded crops]. Sel'skij mekhanizator. – Rural machine operator, 2020; 7: 11–12 (in Russ.).
5. Priporov E. V. Analiz soshnikov otechestvennyh seyalok dlya resursosberegayushchej tekhnologii [Analysis of coulters of domestic seeders for resource-saving technology]. Izvestiya Orenburgskogo gosudarstvennogo agrarnogo universiteta. – Proceedings of the Orenburg State Agrarian University, 2018; 4 (72): 175–178 (in Russ.).
6. Yakovlev N. S., Ivanov N. M., Nazarov N. N., Markin V. V. Rabochie organy posevnyh mashin dlya vozdelyvaniya zernovyh kul'tur [Working bodies of sowing machines for cultivation of grain crops]. Dostizheniya nauki i tekhniki APK. – Achievements of science and technology of agriculture, 2019; 10: 76–80 (in Russ.).
7. Radnaev D. N., Kalashnikov S. S., Badmatsyrenov D.-Ts. B., Kalashnikov S. F. Soshnik [Coulter] Patent RF, no 196015 patenton.ru 2020 Retrieved from https://patenton.ru/patent/RU196015C2 (Accessed 14 January 2021) (in Russ.).
8. Rudenko N. E., Kulaev E. V., Rudenko V. N. Mnogofunkcional'nyj soshnik propashnoj seyalki [Multifunctional ploughshare planter]. Traktory i sel'skohozyajstvennye mashiny. – Tractors and agricultural machines, 2018; 4: 26–31 (in Russ.).
9. Batudaev A. P. (Eds.). Sistema zemledeliya Respubliki Buryatiya: nauchno-prakticheskie rekomendacii [Agriculture system of the Republic of Buryatia : scientific and practical recommendations], Ulan-Ude, Buryatskaya gosudarstvennaya sel'skohozyajstvennaya akademiya imeni V. R. Filippova, 2018, 349 p. (in Russ.).
10. Gorbunov B. I., Pasin A. V., Kistanov E. I., Oshurkov M. V., Pasin P. A., Zavyalov A. V. Sovershenstvovanie soshnika dlya poseva l'na [Improvement of the coulter for sowing flax]. Sel'skij mekhanizator. – Rural machine operator, 2018; 3: 11 (in Russ.).
11. Tumurkhonov V. V., Radnaev D. N., Lobanov I. F., Prokopyev S. N. [Coulter] Patent RF, no 2427124 patenton.ru 2011 Retrieved from https://patenton.ru/patent/RU2427124C2 (Accessed 14 January 2021) (in Russ.).