Impacts Of Quality Of Fruit On Different Treatments Of Cover Bags Of Citrus Grandis Var Jiang Yong

Citrus grandis var Jiang yong which belongs to Rutacese and citrus grandis var shatinyu is one of the famous types of shaddock assortment of our country. In order to improve its quality of fruit, reduce the pesticide pollution, produce no public hazards food, we popularize cover bags to it in production. However, we don't know the impacts of various types of cover bags on its fruit during production, therefore cover bags have very heavy blindness in popularizing, and the result is unsatisfactory. At present, there are less impact on quality of the fruit of cover bags, mechanism research of cover bags and reports. For this reason, regarded twenty-year tree of citrus grandis var Jiang yong as tested materials from April of 2002 to June of 2003 with black membrane, red membrane, blue membrane, yellow membrane, white membrane bags and cow hide container bag, etc for dealing with different types of cover bags, studying its impact on quality of the fruit, seeking better bag of types, and offering reference for high-quality culture of citrus grandis var Jiang yong.The main result of research is as follow:1. The cover bag can improve appearance quality of citrus grandis var Jiang yong. The appearance of the fruit with cover bag which has little disease worm endanger and damage with machinery is smooth, delicate, even and unanimous to colour, and glossy.Then comparing with its appearance quality, it raises notably than ever before. Among all of the cover bags, the appearance of fruit which covered by yellow-brown cow hide and has wax layer would be the most beautiful. Secondly it's blue membrane. But if it's covered by cow-hide container bag, peel display will have a mall amount of yellow-brown rusty spot. Then covered by membrane bag, it is easy for a small a mount of little red spot and little dark spot to grow in the appearance of the fruit.2. Treatment of the cover bag have a certain influence to the fruit. During the process of taking away the cover bag before picking the fruits, cow hide container bag and white membrane bag that deal with the Vitamin C content of fruit have no difference notably with contrast, the others that deal with Vitamin C content lower than contrast notably. Weather it adopts the way of taking off the bags before or after picking the fruits, the different treatments have less notable influence to the fruit of hardness, eating rate, solubility shape thing, and content of sugar and acid.3. The method that takes away the cover bag after picking fruits had no effect on fruit content however the method that takes away the bay before picking the fruit deceased the total content of Vc significantly besides yellow-brown cow hide bag and membrane bag.4. The method that takes away the cover bag before picking the cover bag before picking the fruits enhanced the fruit colour significantly especially to membrane bag, compared with that takes away the cover bag after picking the fruits.