AGROBIOLOGICAL JUSTIFICATION OF PRECISION SEEDER OF CEREAL CROPS

Abstract The purpose of research. To substantiate the agrotechnical requirements for the seeder for accurate (uniform in depth and placement on the area) sowing for grain ear crops of the continuous row method of sowing. The optimal area for plant nutrition and the depth of wrapping winter wheat seeds were determined. Research methods. A field method – to determine the interaction of the object of research with the elements of technology: depth of seed wrapping and feeding area; calculated and weighted – determining the yield of winter wheat. Results. The best conditions for realizing the biological ability of winter wheat plants of the Tobak variety to form the highest grain productivity were during sowing according to the scheme of 7х7 cm and a feeding area of 49 cm2. The yield increase compared to the control (row method of sowing with 15 cm between rows) is 1.05 t/ha, or 13.1%. On the variant with a feeding area of 36 cm2 with a 6х6 cm sowing scheme, the grain yield decreased by 0.15 t/ha, compared to the 7x7 cm scheme. On these two most productive variants, the sowing rate was only 130 kg/ha and 97 kg, respectively /Ha. It is important to note that even with the maximum feeding area (10x10 cm), where only 45 kg/ha of seeds (1.0 million/ha) were sown, the yield remained high and amounted to 7.40 t/ha. In the experiment to study the depth of sowing, the highest yield of the RZHT Reform variety of winter wheat was formed on variants with a 2 cm and 3 cm depth of wrapping, respectively 8.22 t/ha and 8.30 t/ha. Deepening of the seeds by 4 cm led to a yield decreasing by 0.22 t/ha. For sowing to a 5 cm depth the yield was decreased by 0.43 t/ha. Increasing of the sowing depth to 6 cm and 7 cm significantly reduced the yield. Conclusions. The need for uniform placement of seeds on the area and depth requires the creation of a seeder with precise sowing of grain crops seeds of continuous row method of sowing. However, precision sowing has no proper biological and technological grounds. As a result of the research, the optimal parameters of the area of winter wheat plant nutrition (6x6 cm and 7x7 cm) and the depth of seed sowing (2-3 cm) were substantiated. It was concluded that the application of the appropriate technology for growing grain crops with the use of precision seed drills will allow to reduce seed sowing rates by half and increase the field productivity of grain. Key words: winter wheat, feeding area, sowing depth, precision seed drill.