四川栽培柑桔,长期以来,习惯用种子实生繁殖。解放后,研究和推广嫁接繁殖技术,收到了良好的效果。但在一九五八年后,柑桔发展很快,良种苗木供不应求,栽了大量实生苗。这些实生苗,品种不良,种子杂乱,品质差,进入结果和丰产期迟。有的嫁接树,品种也良莠不齐。过去用的“高接换种”,只适用于成年大树换种用,对树体树令小,树形不完整的幼树,换种技术未解决,而且“高接换种”换接枝头少,形成树冠 Citrus cultivation in Sichuan, for a long time, the habit of seed multiplication. After liberation, research and popularization of grafting techniques have received good results. However, after 1958, oranges developed rapidly, seedling shortage in demand, planting a large number of seedlings. These seedlings, poor varieties, seeds messy, poor quality, into the results and high yield late. Some grafted trees, varieties are mixed. Used in the past, “high accession”, only for adult trees for the kind of change, the tree tree to make small tree incomplete tree, another technology is not resolved, and “high exchange” Branches less, the formation of canopy