Effects of Phosphorus Fertilizer on the Growth and Seed Yield of Alfalfa

Effects of different phosphorus fertilizer on dry matter accumulation,phosphorus fertilizer absorption and seed yield were studied by conventional analysis methods in the squaring stage,flowering stage and podding stage of Xinmu 1 alfalfa.Results showed that the dry matter accumulation of different aboveground organs presented P2P3P1P4P5P0.Phosphorus absorption was the highest in the alfalfa flowering stage under P2 treatment and phosphorus content for each organ was 23.94,11.8,8.36 mg·plant-1.The optimal phosphorus fertilizer application was 150 kg·hm-2.The maximum seed yield of alfalfa reached 464.01 kg·hm-2 when effective branch number,effective flower number,pod number,and thousand seed weight per plant was 43,123,403 and 1.41 g,respectively.