Abstract
This article presents data from the results of two years of research by undergraduates on the effects of types, norms and ratios of fertilizers on alfalfa yields for 2 and 3 years of life, which were conducted in a long-term stationary field experience of the PAZ department, operating since 1967. The creation of a solid feed base is one of the priority tasks of agronomy, which will contribute to the development of animal husbandry and the solution of Food security of the republic. Research on the development of an alfalfa fertilizer system on gray-earth meadow soils, with prolonged use of fertilizers at the beginning of the 10th rotation of the field crop rotation, is being conducted for the first time, so the relevance of the research is beyond doubt. The obtained research results are of great theoretical and practical importance. It was found that mineral fertilizers have a significant effect on the yield of alfalfa hay, depending on the types, norms and ratios of fertilizers, yield increases to control ranged from 28.0 to 102.6 c/ha. The greatest impact on the yield of alfalfa hay was exerted by phosphorous, then potash and to a lesser extent nitrogen fertilizers. The increase in the norms of the use of mineral fertilizers had a certain positive effect, the introduction of double and one–and-a-half norms of fertilizers ensures higher yields of alfalfa hay (on average for 2 years) - 270.0 c/ha and 267.3 c/ha, respectively. A unilateral increase in the dose of phosphorus (1.5 P) fertilizers against the background of full norms of nitrogen and potash fertilizers had some positive effect on increasing the yield of alfalfa hay, while an increase in the dose of nitrogen (1.5 N) led to a decrease in this indicator compared with the use of full norms of fertilizers
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References
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