环割是促进作物生长改向的一种机械损伤技术,但环割时期和程度不同,会产生不同的结果。龙眼叶片的光合产物一部分是通过韧皮部的筛管运往根系,为根系的伸长和增粗提供有机营养,保证根系的生长和各项功能的正常运转。环割是在龙眼枝干的某处,将皮层和韧皮部切断,阻止光合产物向? Ring cutting is a mechanical damage technique that promotes the redirection of crop growth. However, different periods and degrees of ring cutting result in different results. Some of the photosynthetic products of the longan leaves are transported to the roots through the phloem sieve to provide organic nutrition for root elongation and thickening to ensure the growth of the root system and the normal operation of various functions. Ring cutting is somewhere in the longan branches, the cortex and phloem cut off, to prevent photosynthetic products to?