Effectiveness of Fertilizers in the Cultivation of Alfalfa on Permafrost Soil

In a field experiment conducted at the field station of the Yakut Scientific Research Institute of Agriculture named after M.G. Safronov, the effect of mineral fertilizers and a biological product based on local nodule bacteria strains on the yield and quality of a new feed crop for Central Yakutia, the sickle alfalfa of variety Yakut yellow variety, as well as on the agrochemical properties of permafrost taiga pale-yellow soil was investigated. It was found that on cold permafrost soil, the application of mineral fertilizers in doses of N60P60K30 was an effective technique that ensured the preservation of soil fertility and the stability of sowing sickle alfalfa, yielding an average hay yield of 6.9 t/ha over 4 years, or 27.7% more than the control without fertilizers. Alfalfa hay was of high quality, containing on average 15.5% crude protein, 2.6% crude fat, 0.3% phosphorus, 1.9% calcium. The use of the biopreparation during inoculation of alfalfa seeds with local nodule bacteria strains Yakutsky 1 and Yakutsky 2 increased its yield to 6.3 t/ha, or by 16.6% relative to the control. When cultivating sickle alfalfa of the Yakut yellow variety on permafrost taiga pale-yellow soil, biological nitrogen fixation was 50 kg N/ha with phosphorus-potassium fertilizers (P60K60), 55 kg of biological product and 81 kg/ha of complete mineral fertilizer at doses of N60P60K30.

permafrost taiga pale-yellow soil, mineral fertilizers, doses and combinations, biological product, sickle alfalfa, yield, hay quality