an increasing trendP < 0.01
With the increase of fertilization level F 0 to F 2 , the GP and GR of WL354HQ and Xinmu No.4 alfalfa showed an increasing trend, and the GP was highest in F 2 W 2 treatment (0.83% and 0.83%), which were 33.87% and 31.75% higher than that of F 0 W 1 , respectively ( P < 0.01).