论文部分内容阅读
黄土高原沟壑区的苹果园面积，已发展到６６万ｈｍ２（公顷）左右，大部分分布在土壤瘠薄的沟坡地梯田上，少水缺肥，水土流失较严重。根据我们的经验，该区苹果园里适于种植白三叶草与红三叶草。１白三叶草与红三叶草的特性这两种草属豆科三叶草属多年生草本植物。它们的...
The apple orchard area in the gully area of the Loess Plateau has grown to about 660,000 hectares (hectares), most of which are located on terraced fields with barren slopes, with less water and lack of fertility and more serious soil erosion. In our experience, the apple orchard in this area is suitable for growing white clover and red clover. A white clover and red clover characteristics of these two grass leguminous clover is a perennial herb. their...