流行的高割线割胶方法是从离地约110吋处开始向下割的,这在最初似乎是合理的方式。我和别人一样,对这种割胶方式累积了长期经验,到现在,不得不指出,这种方法在原理上和经济上都是错误的。我们应该在50吋处往上割而不是在110吋处往下割。困难在于怎样能够象往下割那样割得精确和均匀,并且一个月的树皮消耗量同样只有一吋。在50吋处开 The popular high-cut-line tapping method starts with a downward slitting about 110 inches off the ground, which seems to be a reasonable first. Like many others, I have accumulated long experience in this type of tapping method. Now I have to point out that this method is both theoretically and economically wrong. We should cut up at 50 inches instead of down at 110 inches. The difficulty is how to cut it accurately and evenly as you cut it down, and the bark consumption for a month is equally as small as one inch. Open at 50 inches