Abstract
The effect of phosphorus fertilizer on the yield of new alfalfa cultivars Kokorai, Osimtal, and Kokbalausa has been identified after the introduction of P 0 , P 150 , and P 200 (active substance) with nitrogen N 60 , potassium K 70 , 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 P 150 , and by 35.9% with P 200 .The introduction of nitrogen N 60 on all phosphorus backgrounds increased productivity by 112 -117%, the introduction of potassium K 70 -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 P 200 , 89.8 t/ha -after the introduction of P 200 N 60 , 82.9 t/ha -after the introduction of P 200 K 70 , 88.9 t/ha -after the introduction of P 200 Co, and -89.5 t/ha after the introduction of P 200 Mo.Generally, the difference between the cultivars' response to the fertilizer is weak, they all equally respond to the fertilizer.