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对橡胶树热研7-18-55的3种种植密度——500株/hm2、667株/hm2和833株/hm2的生长、产量等性状进行对比分析,主要结果如下:（1）在开割前,不同种植密度间的茎围生长速度有一定的差异,但未达显著水平;开割后,500株/hm2的茎围年均增量极显著大于833株/hm2、显著大于667株/hm2的。（2）500株/hm2的单株干胶产量极显著高于833株/hm2的。（3）3种种植密度间的单位面积干胶产量无显著差异。（4）不同种植密度间的叶面积指数无显著差异。（5）种植密度越大,原生皮的厚度越小,再生皮生长的速度也较慢。（6）500株/hm2的死皮率较低,风害略轻。建议热研7-18-55的种植密度以500株/hm2左右为宜。
The growth, yield and other characteristics of the three kinds of planting density - 500 plants / hm2, 667 plants / hm2 and 833 plants / hm2 were studied and compared. The main results are as follows: (1) Before and after planting, the growth rate of stems around different planting densities differed to a certain extent, but did not reach the significant level. After cutting and cutting, the annual increment of 500 stems / hm2 stems was significantly greater than 833 plants / hm2, significantly higher than 667 plants / hm2’s. (2) The yield per plant of 500 plants / hm2 was significantly higher than that of 833 plants / hm2. (3) There was no significant difference in dry weight per unit area between the three planting densities. (4) There was no significant difference in leaf area index between different planting densities. (5) The greater the planting density, the smaller the thickness of the primary skin, the slower the growth of the regenerated skin. (6) 500 plants / hm2 lower rate of dead skin, wind slightly lighter. It is suggested that the planting density of 7-18-55 should be about 500 plants / hm2.