Effects of different mixture models of Italian ryegrass and Smooth vetch onabove ground biomass and quality

Effects of 8 different planting models of Italian ryegrass and Smooth vetch on above ground biomass and quality were studied in Liangshan Prefecture. The results showed that, the hay yields of planting sowing treatments were significantly higher than that of single planting treatments(P0.05). Compared with treatments of single planting Italian ryegrass and Smooth vetch, the yields of interplanting treatments increased by 1.90%~8.45% and 38.16%~47.04%, respectively. The highest hay yield(17 730.53 kg·ha-1) and crud protein yields(2 520.13 kg·ha-1) were observed in treatment A6(50% Italian ryegrass+50% Smooth vetch). Under this planting model, land usage efficiency were improved by 55%. Besides, compared with single plant Italian ryegrass and Smooth vetch, its hey yield improved by 43.19% and 94.15, and crud protein improved by 90.59% and 71.18%, respectively. According to the analysis of grass yield, crud yield and land equivalent ratio, higher interspecific synergistic benefits were generated, and relative high hay yield were produced by applying the planting model of 50% Italian ryegrass+50% Smooth vetch in Liangshan Prefecture.