The features of production of spring rapeseed for seeds using Clearfield technology at different sowing periods in Non-Chernozem conditions

The purpose of the research was to evaluate the production of spring rape for oil seeds in the Clearfield system at different terms of crop sowing in the conditions of non-chernozem zone of Russia. The researches were conducted in the conditions of experimental agrotechnological station FSBEI RSATU, Ryazan district, Ryazan Region. Clearfield is an innovative combination of selective herbicide and high-yield spring rape hybrids resistant to this herbicide. Using this system provides a number of agronomical advantages in the course of cultivation of spring rape. In the studies herbicide screen prevented the development of subsequent waves of weed vegetation throughout the whole vegetation period. It is necessary to note high efficiency of Clearfield system regardless of weather and soil conditions, as well as the need for long-term use of herbicide treatment after the germination phase, and before budding, allowing to level the timing of the application of agrochemicals against weeds, and apply it at optimal time. In the experiments the plants of rapeseed hybrids Salsa KL, Mirko KL, Mobile KL had different intensity of development, in this connection during growing season, different temperature, light, and water conditions were formed in the agrocenosis. The productivity of spring rape was higher at the first sowing period (III decade of April) than at the first sowing period in May. The maximum yield was obtained at the first sowing period on mobile CL variant (29.4 c/hectare); at the second sowing period - on Salsa CL variant (27.4 c/hectare). The components developed of spring rapeseed cultivation technology using Clearfield system provided high economic effect of oilseed production (80.2-93.0 %), which allowed agricultural producers to get a guaranteed profit.