造成苹果树旺长的原因较多,或因栽植密度过大,或因短截过多,(?)剪过重,或因氮肥用量过多等。这种旺树枝条很多,枝组稀少。产量很低,着色很差,投入不少,经济效益不高。对这种树,应局部控制,全树轻剪,稳定树势,成花结果。局部控制,就是对骨干延长枝 Apple trees caused by a long reason for more, or because planting density is too large, or because of too much short cut, (?) Shearing weight, or excessive nitrogen fertilizer and so on. This is a lot of wang branches, sparsely branched group. Low yield, poor coloring, a lot of investment, economic efficiency is not high. For this kind of tree, it should be controlled locally, cut the whole tree, stabilize the tree vigor, and bear fruit. Local control is to extend the backbone of the branches