Influence of soil conditions on the yield of white lupine

The research was conducted in 2017-2019 in the Oryol district of the Oryol region on dark gray forest soil. The object of this study was the agrocenosis of white lupine varieties Degas. The aim of the research is to identify the influence of agrochemical and aggregate composition of the soil, as well as starting doses of nitrogen fertilizers on the yield of white lupine. Lupin's predecessor was spring wheat. Sowing was carried out in the middle of May in a narrow row method with row spacing of 7.5 cm. The seeds were treated with the fungicide Vitaros (tiram198 g/l + carbaxin 198 g/l) at the rate of 2.0 l/t before sowing. During the growing season, before the formation of beans, the plants were treated twice with the fungicide Amistar extra at a dose of 0.5 l/ha. The treatment was carried out with a manual sprayer based on the flow rate of the working solution of 200 l/ha. The registered area of experimental plots was 50 m2. Placement of plots is systematic. The experience is repeated three times. It was found that nitrogen fertilizers contribute to a significant increase in crop yield, which is consistent with the results of other researchers. The introduction of nitrogen at a dose of 20 kg/ha active substance allowed to get an increase in yield by 7.4%, at a dose of 40 kg/ha - by 11.9%, and 60 kg/ha - by 15.7%. When cultivating white Dega lupine on dark gray forest soil with a high supply of phosphorus and potassium, it is advisable to apply a starting dose of nitrogen fertilizers at a dose of 40 kg/ha for active substance. This provides an increase in the yield of lupine seeds by 2.82 C/ha. Between the variants of the experiment with nitrogen doses of 40 and 60 kg/ha active substance there was no significant statistical difference in yield.