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三种砧木（ＭＭ．１１１，ＭＭ．１０６和Ｍ．９）、三种中间砧类型（红元帅，ＭＭ．１０６和Ｍ．９）和四种中间砧长度（２．５ｃｍ，７．５ｃｍ，１２．５ｃｍ和１８ｃｍ）、对地上部树皮比例的影响试验已有四年，头三年所有植株各部位的树皮比例都在减少，但在第四年则很少或不减少。在不同砧木中新生部分的树皮比例没有差异，但是对接穗本身的树皮比例则有影响。接在Ｍ．９砧木上的接穗有最大的比例，但接在Ｍ．１１１砧木上的则比例最少。在中间砧类型中，不论新生部分的树皮比例或接穗和中间砧本身的树皮比例，凡接在Ｍ．９中间砧上的都比接在红元帅中间或ＭＭ．１０６中间砧上的比例高。除Ｍ．９中间砧之外，中间砧的长度对树皮比例没有影响。在Ｍ．９中间砧的树上，１２．５ｃｍ和１８ｃｍ长的中间砧比２．５ｃｍ长的其新生部分的树皮比例比较高。此外１８ｃｍ长的中间砧比任何其他三种长度中间砧的接穗的树皮比例都高，但中间砧本身的树皮比例以７．５ｃｍ长的最大。
Three kinds of rootstock (MM.111, MM.106 and M.9), three types of anvil (Red Marshal, MM.106 and M.9) and four kinds of anvil length (2.5cm, 7.5cm, 12 .5 cm and 18 cm). The effect on the proportion of bark aboveground has been tested for four years. The proportion of bark in all parts of the plant decreased in the first three years but little or no in the fourth year. There is no difference in the proportion of bark in the nascent parts of the different rootstocks but in the proportion of the bark of the scion itself. Then M. 9 rootstock scion has the largest proportion, but in M. 111 rootstock is the least proportion. In the type of intermediate anvil, whatever the bark proportion of the newborn or the proportion of the bark of the scion and the intermediate anvil itself, whatever is in M. 9 than the middle of the anvil in the middle of Red Marshal or MM. 106 on the anvil on the high ratio. In addition to M. Outside the 9 anvil, the length of the intermediate anvil has no effect on the proportion of bark. In M. In the tree of 9 intermediate anvil, the proportions of the barks of its fresh parts of 12.5 cm and 18 cm long intermediate anvil longer than 2.5 cm are relatively high. In addition, the proportion of the bark of the 18 cm long intermediate anvil is higher than that of any other three intermediate length anvils, but the proportion of the bark of the intermediate anvil itself is the largest of 7.5 cm.