橡胶芽接树,一般定植15年后进入中龄期。这时期胶树产胶能力旺盛,割胶对生长影响小,最适合施用刺激剂。我国六十年代至七十年代初大量种植的橡胶芽接树,至今已达15龄以上,是我国目前的主要产胶树。由于以前割胶强度太大,这些胶树相当部分已割完树干1.5米以下的 Rubber bud pick tree, general planting 15 years later into the middle age. Gum tree gum production capacity during this period strong tapping on the growth of small, most suitable for the application of stimulants. China’s sixties to the early seventies large-scale planting of rubber bud tree, has reached more than 15 years old, is China’s current main production tree. Due to the large previous tapping strength, a considerable part of these gum trees have been cut off the trunk below 1.5 meters