Relevance и methods. In the field experiment in the conditions of sod-podzolic sandy loam soil of the Central region of the Non-Chernozem zone, the influence of four sowing periods (30.04; 05.05; 10.05; 15.05) on the formation of the yield of early-maturing soybean seeds of the variety Svetlayawas studied.Results. When sowing at a later date, the emergence of seedlings was accelerated and a faster development of plants was observed during the growing season. Thus, when sowing on May 15, the duration of the sowing — germination period was reduced by 6 days compared to sowing on April 30, and the duration of the growing season from germination to maturation was reduced by 4 days. When sown on April 30, soybeans reached harvest ripeness steadily in the third decade of August, when sown on May 15, the ripening of soybeans goes to September, which can lead to unstable ripening of seeds, since the temperature regime in September does not meet the requirements of soybeans. The conducted studies have shown that high yields of soybean seeds at the level of 2.73 t/ha can be obtained on the sod-podzolic sandy loam soil of the Central region of the Non-Chernozem zone in favorable weather conditions. The most favorable conditions for the formation of a seed harvest in this region are created when sowing on May 5. When sowing on April 30, decreasesuch indicators as field germination — by 12.7%, plant survival — by 2.2%, the height of the first inflorescence — by 2.6 cm and the biological yield of seeds — by 20.1% . At later sowing dates, there is also a decrease in seed yield by 19.5–40.8% due to a decrease in field germination (by 2.9–4.9%) and the weight of seeds from the plant (by 21.6–32.4%).
Providing the brewing industry with locally produced raw materials is important both from an economic point of view and in terms of import substitution. Breeders create brewing barley varieties with a reduced protein content, however, in production they often use universal varieties that combine high yields with an average protein content of 11–12%. For such varieties, it is necessary to develop technological methods for obtaining a crop with specified properties, depending on the purposes of using the products. The quality indicators of barley grain and the efficiency of its production are significantly influenced by mineral fertilizers and the minimization of soil cultivation. In this regard, the authors studied the effect of minimal tillage on the yield and grain quality of spring barley of the Vladimir variety at two levels of mineral nutrition (without fertilizers 26 and with full supply oif mineral fertilizer – N35P40K135) in a two-factor field experiment carried out in 2018–2019 on the medium-loamy light gray forest soil. The experiment helped determine the yield and structure of the crop, the content of protein, starch, and grain hoodness (hull content). It was found that the lack of precipitation during the barley tillering – heading period leads to a decrease in grain yield by 40.0–54.8% as compared with the conditions of increased moisturizing. At the same time, there was an increase in the grain protein content by 1.4–1.7% and the grain filminess by 0.5–0.9%. The use of moderate rates of complete mineral fertilizer (N35P40K85) led to an increase in the barley yield by an average of 13.2% and the grain protein content by an average of 0.2%. On the other hand, it led to a decrease in the grain filminess by 0.2% and starch content by 0.4–0.6%. The positive effect of nitrogen fertilizers on the increase in protein content in barley grain was higher under minimal tillage. Under minimal tillage, regardless of the level of moisture supply and mineral nutrition, there was a tendency towards a decrease in the barley yield by an average of 3.9%, mainly due to a decrease in the density of the productive stalk. There was also a tendency towards a decrease in the protein content in the barley grain – by 0.3% – when no complete mineral fertilizer was used.
With a moisture deficit, nitrogen fertilizers did not have a significant effect on the yield of the sowing vetch, but increased the yield of the mixture due to spring wheat. With optimal moisture, they reduced the yield of the vetch sowing, but the total yield of the mixture did not decrease due to the increase in the yield of spring wheat.
Application of nitrogen fertilizers at a dose of 30 kg/ha under the vetch and oat mixture practically does not affect the yield of vetch, but increases the yield of oats by an average of 21.7% and the yield of the vetch and oat mixture by 11.1 %. Nitrogen fertilizers in doses of 60 and 90 kg / ha reduce the yield of vetch in the vetch and oat mixture by an average of 21.5% and 31.6%, respectively, but increase the yield of oats by 47.8% and 73.9%, respectively; the yield of the mixture increases by 15.7% and 25.1%.The payback of 1 kg of mineral nitrogen by adding the yield of the vetch -oat mixture was at a dose of N30+6.3 kg/kg, at doses of N60 and N90 + 4.5 kg/kg and +4.8 kg / kg, respectively.
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