Effect of foliar application of PASP on the biological characteristics and yield of alfalfa

The effect of foliar application of PASP with different application rates on the yield and biological characteristics of alfalfa was studied and the result indicated that the PASP application could remarkably increase the hay yield of alfalfa at a proper application rate (P0.05), and the best was 20 mg/L, the hay yield were 14 424.03 kg/hm2 which was 13.68% more than CK. The biological characteristics of alfalfa were also influenced by the treatments. The height, leaf area and internode number reached the maximum at 20 mg/L. The stem diameter and shoot number reached the highest at rates of 40 mg/L and 60 mg/L respectively.