【摘要】 微割制度[Mc5↑、Mc4↑、Mc3↑、Mc3↑·Mc3↑（m／2，m／2）]2a的研究结果表明，使用乙烯气体（每周期150～80mL）刺激，在大幅度减刀的情况下，2a平均产量为对照（s／2d／3＋ET2．5％）的101．2％～113．0％。微割主要是通过延长排胶时间而获得产量的。采用微割技术，胶乳保持着较高的蔗糖含量和较高的硫醇含量，镁含量下降，无机磷含量略有上升，试验发现微割引起橡胶树高破裂指数长排胶这一新现象。更多还原

【Abstract】 Rubber trees in old plantations of clone PR107 were tapped upward on the original bark of higher POrtion(1 .6 m or so) of the trUnk under microcut stimulated system (Mc5 ↑,Mc4 ↑,Mc3 ↑ or Mc3 ↑ +Mc3 ↑ (m/2,m/2)).Two years of microcnt tapping showed the old rubber plantations produced an average yield 101 .2 %-113.0 % ofthe control (s/2 d/3+ET2.5 %) under reduced tapping frequency by applying ethylenegas stimulant (15o-80 mL/t).The yield was obtained by prolonging latex now time under microcut system.The resultant latex maintained high sucrose and R-SH content,slightly high Pi but low Mg2+ content.And a new phenomenon of high bursting indexand long flow time was also observed.更多还原