Some shade tolerance forage species of Lolium multiflorum, Dactylis glomerata, Bromus carticus and Trifolium repens were selected to sow in pear orchard.
通过试验，筛选出了适宜在梨园行间种植的多花黑麦草、鸭茅、扁穗雀麦、白三叶等较耐荫草种。
2
Thinking about the origin, it can be sure that subspecies himalayensis belong to natural origin ecotype, but subspecies glomerata was likely to belong to naturalization species.