ABSTRACT

The use of common vetch in smallholder crop-livestock systems has expanded widely in recent years, partly to relieve grazing pressure and improve seasonal supply of high-quality herbage. The aim of this work was to evaluate plant fraction biomass accumulation, forage quality attributes and nutrient yields, and water use efficiency (WUE) responses of a local and an improved cultivar of common vetch in a two-year study on the Tibetan Plateau. No differences were observed between the cultivars for dry forage yield, nutrient yields, and WUE. Regressions of forage quality attributes and nutrient yields on growing degree days were explained and coefficients of determination were high in all cases (R² ≥ 0.833). These results demonstrate that air temperature information can be a useful tool for understanding forage quality attributes and nutrient yields of common vetch. The models from this study also provided in-field estimation of forage yield potential and nutrient components, which can guide farmers in appropriate use of common vetch forages.

摘要

近年来，在小农作物-畜牧系统中使用野豌豆已广泛扩大，部分原因是为了缓解放牧压力并改善优质牧草的季节性供应。这项工作的目的是在为期两年的青藏高原研究中评估当地和改良的紫云英品种的植物部分生物量积累、草料质量属性和养分产量以及水分利用效率 (WUE) 响应。在干草料产量、养分产量和 WUE 方面，未观察到栽培品种之间的差异。牧草质量属性和养分产量在生长期的回归得到了解释，所有情况下的决定系数都很高（R ² ≥ 0.833)。这些结果表明，气温信息可以成为了解普通紫云英的牧草质量属性和养分产量的有用工具。本研究的模型还提供了牧草产量潜力和营养成分的田间估计，可以指导农民适当使用普通的野豌豆牧草。