Productivity of the Green Mass of New Alfalfa Cultivars Depending on the Effect of Macro- and Microfertilizers on Various Phosphorous Backgrounds

The effect of phosphorus fertilizer on the yield of new alfalfa cultivars Kokorai, Osimtal, and Kokbalausa has been identified after the introduction of P₀, P₁₅₀, and P₂₀₀ (active substance) with nitrogen N₆₀, potassium K₇₀, microelements (cobalt (Co), molybdenum (Mo)) on the three noted phosphorus backgrounds. Increasing the dosages of phosphorus increases the yield of the green mass of the three cultivars on various backgrounds without the introduction of any other types of fertilizers on average by 126.6% with P₁₅₀, and by 35.9% with P₂₀₀. The introduction of nitrogen N₆₀ on all phosphorus backgrounds increased productivity by 112–117%, the introduction of potassium K₇₀ – by 102–110%, the introduction of cobalt Co – by 113–122%, and the introduction of molybdenum Mo – by 115–126%. The highest productivity was observed in the Kokbalausa cultivar, the level of its green mass yield was 77.7 t/ha after the introduction of P₂₀₀, 89.8 t/ha – after the introduction of P₂₀₀N₆₀, 82.9 t/ha – after the introduction of P₂₀₀K₇₀, 88.9 t/ha – after the introduction of P₂₀₀Co, and – 89.5 t/ha after the introduction of P₂₀₀Mo. Generally, the difference between the cultivars’ response to the fertilizer is weak, they all equally respond to the fertilizer.