柑桔完熟能提高果实糖度 ,但在大部分柑桔产区由于有霜冻 ,在露地栽培条件下果实不能挂树越冬。所以在日本部分柑桔产区将宫川温州蜜柑、脐橙等果实单果套袋 ,延迟采收 ,以提高糖度 ,改善外观 ,作为特色果销售 ,售价是不套袋果的 2～ 4倍。国内还未见这方面的报道。为了研究柑 Citrus ripening can improve the fruit sugar, but in most citrus growing areas due to frost, the fruit can not hang trees in the open field conditions. Therefore, in some Japanese citrus producing areas will Gongchuan Wenzhou Satsuma, navel orange and other fruit bagging, delayed harvest, to improve the sugar content, improve the appearance, as the characteristics of fruit sales, the price is not bagged fruit 2 to 4 times. There is no such report yet in China. In order to study mandarin