割去部分树皮的常规割胶,会引起局部树液流动的减少。久之,造成胶乳同化所需原料的亏缺,从而使产量下降。由此促进了一种新的采胶方法的研究,即不再割去树皮而仅简单地针刺树皮就能导致排胶。只有在刺激处理后才能从几个针孔排出相当多的胶乳。1973年非洲橡胶研究所的一些初步试验已经显示了针刺采胶的好处。这些令人鼓舞的试验结果促使 Cutting off part of the bark of the conventional tapping, will cause the local reduction of sap flow. For a long time, resulting in the loss of raw materials needed for latex assimilation, thus reducing the yield. This has led to the development of a new method of gum removal that results in gum removal simply by barking the bark without cutting the bark. Only a few pinholes can be excreted after stimulation. Some initial tests conducted by the African Rubber Institute in 1973 have shown the benefits of needling. These encouraging test results prompted