Effects of planting patterns on dry weight, N yield and dinitrogen fixation in alfalfa meadow fescue pasture are studied by using split plot design in the field for two successive years.

• 田间试验采用裂区设计，在不同种植模式下采用15N示踪研究了苜蓿与牛尾草混播及单播草地的产草量、产氮量和固氮量的变化。