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1978—1981年的试验结果表明,RRIM600是较适合提早针刺投产的无性系。在平均树围42.2厘米时采用盘状针刺采胶法采胶,头四年获得单株干胶总产15公斤、每亩450公斤的高额产量。当开采第三、四年平均树围达50厘米以上时,单株年产干胶达4.65～5.04公斤,比相同树围的对照刀割树增产70.6～146.0％。采胶次数比对照少,干胶含量比对照高2.8％,生长量与对照基本相同,副作用尚不明显。据此,初步认为,我国海南地区幼龄无性系RRIM600以林段中有50％的胶树离地1.2米处树围达到40厘米为开采标准。开采时,林段中树围35厘米以上的胶树亦应全部针刺投产。统计分析表明,采胶当年不同树围与产量和干胶含量都呈极显著的正相关(n=6,r=0.988和r=0.993)。但刚开采时不同的树围对采胶三年后产量的影响比采胶当年不同树围对产量的影响小(n=5,r=0.830,达不到显著水准)。本文还介绍了产量刺激剂电石的施用方法。
The experimental results from 1978 to 1981 showed that the RRIM600 is a clonal system suitable for early acupuncture. In the average tree circumference of 42.2 cm disk-shaped acupuncture mining plastic mining method, the first four years to obtain a single plant adhesive yield of 15 kg, 450 kg per mu of high yield. When the average tree in the third and fourth years of mining was over 50 cm, the annual dry yield per plant reached 4.65-5.04 kg, which increased by 70.6-146.0% over the control tree cuttings with the same tree circumference. Digging times less than the control, dry glue content of 2.8% higher than the control, growth and control basically the same side effects are not obvious. Based on this, it is preliminarily believed that the RRIM600 of the young clones of Hainan Island in China reaches 40 cm from the tree margin of 1.2 m at the place where 50% of the gum trees in the forest stands reach the ground. When mining, trees in the forest around 35 cm plastic tree should be all acupuncture put into operation. Statistical analysis showed that there was a significant positive correlation between yield and adhesive content (n = 6, r = 0.988 and r = 0.993). However, the influence of different tree shrubs on the yield after three years of plastic mining was smaller than that of the different trees during the first mining (n = 5, r = 0.830, reaching a significant level). This article also describes the production of stimulant calcium carbide application method.