7~9月是南方柑橘类果树的果实膨大期,这个时期一方面果实膨大需要大量的养分,另一方面夏、秋梢生长也需要营养。因此,营养生长和生殖生长养分竞争十分激烈,然而,这个时期又正是南方高温干旱期,会导致树体内促进生长类激素水平的降低和光合作用效率的下降,不利于果实膨大。因此,加强果实膨大期的管理,是保证柑橘优质高产的重要环节,为此,要抓 July to September is the fruit of the southern citrus fruit swollen period, on the one hand this period of fruit enlargement requires a lot of nutrients, on the other hand, summer and autumn shoot growth also needs nutrition. Therefore, nutrient competition between vegetative and reproductive growth is very fierce. However, during this period of high temperature and drought in the south, it will lead to the decrease of growth hormone and the decrease of photosynthesis efficiency in the tree, which is unfavorable to fruit enlargement. Therefore, to strengthen the management of fruit enlargement period is to ensure the high quality and high yield of citrus is an important part of this