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我国六十年代大量种植的高产无性系,迄今已进入化学刺激的最佳时期。据1985年广东和云南垦区初步统计,这些中龄旺产芽接树约有850万株,34万亩,是目前我国产胶的主要胶树。按照常规,芽接树第一、二割面要割13～15年。然而在1970年初,这些胶树普遍受过强割,以致至今相当部分的树皮不够周转,产量逐年递降。因此,不失时机地对中龄芽接树研究和推广乙烯利刺激新
The high-yielding clones grown in large quantities in the 1960s have so far entered the best period of chemical stimulation. According to the preliminary statistics of Guangdong and Yunnan reclamation areas in 1985, there are about 8.5 million middle-aged budding trees with a total area of 340,000 mu. It is the main gum tree in China. In accordance with the conventional, budding tree first, two cutting surface to cut 13 to 15 years. However, in early 1970, these gum trees were generally severely cut so that a considerable part of the bark so far was not sufficiently working and the production dropped year by year. Therefore, seize the opportunity to study the middle-aged budding tree and promote ethephon stimulate new