红薯是一种适应性强、产量高的作物,在北方果园中常用来作间作物。红薯初期需肥水较少,对果树影响较小,后期薯块形成期,需肥水多,对生产过旺树,间作红薯可使其提早停止生长。但是,红薯生长旺盛时绿叶将地面完全覆盖,地面向树冠反射光极少,内膛及树冠下部显得光 Sweet potato is a highly adaptable and high-yield crop that is often used as a crop in the northern orchards. Sweet potato needs less fertilizer in the initial stage, and has little effect on fruit trees. In the later stage of potato tuber formation, more fertilizer and water are needed, and the production of sweet potatoes can make it stop production early. However, when the sweet potato grows vigorously, the green leaves cover the ground completely, the reflected light to the canopy is very few, and the lower part of the inner can and the crown appear to be light