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我们在1973～74年冬特大寒害后,曾经进行了不同烂脚级别的割胶试验,1975年又继续观察了寒害后割胶的情况。结果表明,胶乳产量随着烂脚级别的增大而下降;干胶含量则随着烂脚级别的增大而升高。1～4级的烂脚树,干胶含量和胶乳产量与未受害的○级树相差不大,且在寒害后的第二年就恢复了正常。但5～6级树因寒害太重,有些逐渐枯死,有些还能产胶,但不容易恢复正常水平。因此初步认为各级寒害树都没有停割的必要。1975～1976年冬,我们垦区又遭到特大寒
After the severe winter drought in 1973-74, we conducted different types of tapping tests with different rotten feet. In 1975, we continued to observe the situation of tapping after cold injury. The results showed that the yield of latex decreased with the increase of rotten feet and the content of dry gum increased with the increase of rotten feet. The rotten-footed trees of grades 1 to 4 showed little difference between the dried gum content and latex yield and the unimproved o-grade trees, and returned to normal in the second year after the cold injury. However, 5 ~ 6 trees due to cold damage too heavy, some gradually withering, and some still produce plastic, but not easy to return to normal levels. Therefore, preliminary thought that all levels of cold-cut trees are not necessary to stop cutting. From 1975 to the winter of 1976, our reclamation area was especially cold again