Nitrogen-fixing ability of perennial leguminous grasses in various environmental conditions of the Western Siberia

Abstract

The goal of the research was to determine the nitrogen-fixing ability of perennial leguminous grasses and their use of biological nitrogen to form the crop of fodder in different environmental conditions of Western Siberia. The nitrogen-fixation coefficient (Cf) was determined by the method of comparison with a non-leguminous plant. It has been established that in the southern forest-steppe on meadow-chernozem soil biological nitrogen is used more efficiently using Medicago varia, Galega orientalis, Onobrychis arenaria и Astragalus galegiformis. Plants of these species fix up to 233–379 kg/ha of air nitrogen during the growing season, Cf is equal to 0.56–0.78. The accumulation of symbiotic nitrogen by leguminous grasses is 1.1–4.6 times less in the northern forest-steppe in solonetz fine than in meadow-chernozem soil. Medicago varia at solonetz forms due to biological nitrogen to 58% of yield and Astragalus galegiformis only 10-22%.

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“…It should be noted that since 2000, when the use of redistributing along the soil profile, being lost in the process of denitrification, binding to atmospheric nitrogen by legumes by symbiotic fixation, etc. (Moreau et al, 2019;Wang et al, 2021;Stepanov et al, 2021).…”

The problem of nitrogen in modern agriculture

“…It should be noted that since 2000, when the use of redistributing along the soil profile, being lost in the process of denitrification, binding to atmospheric nitrogen by legumes by symbiotic fixation, etc. (Moreau et al, 2019;Wang et al, 2021;Stepanov et al, 2021).…”