开割不够大的橡胶树是不经济的,而且可能妨害它们将来的发育,甚至会使某些无性系容易断干。目前采用的芽接钳的开割标准,是在开割高度的树围达到20时,但这个数字是最低限度的数字,就某些容易断干的无性系说来,可能需要提高。开割一个树位时,作为最低开割标准的每亩可割树株数,终究取决于开割是否有利。到目前为止,一般推荐的开割标准是每亩有100株可割树,或一个林段有70%的可割树。但是,对于这些数字的争论比对于最低树围开割 Not enough cuts of rubber trees are uneconomical, and may hinder their future development, and even make some clones easy to dry. The currently adopted standard for splicing pliers is 20 at the height of the cut tree, but this figure is the minimum figure which may need to be increased for some clones that are easily broken. When cutting a tree bit, the number of cut trees per acre that is the minimum cut-off criterion depends on whether the cut is favorable or not. So far, it is generally recommended that the cut standard is 100 cuttable trees per acre or 70% cutable in a forest. However, the arguments for these numbers are more open than for the lowest tree circumference