一、前言 锦橙是优良的中熟甜橙品种之一,果形长椭圆,风味香甜,特别适于温暖湿润的气候。四川万县地区位于长江中上游,临江两岸栽培的锦橙表现优良,由于成熟期一致,产品集中上市,造成运输紧张,腐烂严重,商品价值不高。为了解决柑桔生产中存在的上述矛盾,我国农民早有用包扎防寒等办法延迟采收柑桔。国外已用生长素防止落果,用 I. INTRODUCTION Jincheng is one of the best mid-ripe sweet orange cultivars. Its fruit-shaped oval and sweet flavor are especially suitable for warm and humid climate. The Wanxian area of ​​Sichuan is located in the middle and upper reaches of the Yangtze River. Jincheng, cultivated on both banks of the Linjiang River, performed well. Due to the consistent maturity stage, the products were listed on the market, resulting in serious transportation and decay, and the value of the commodities is not high. In order to solve the above contradictions in citrus production, peasants in our country have long delayed the harvest of citrus by means of bandaging and cold prevention. Abroad has to use auxin to prevent falling fruit