Research On Date Of Debagging And Picking Of Red 'Fuji'Apple And Its Physiological Properties During Storing

Bagging for apple can improve coloring, make fruit luminous, reduce remain ofagrochemical and increase price in market. Debagging date has a important effect on thequality of fruit. A different debagging experiment for short-branch ?Red Fuji. apple wasconducted by using Jinggong double bag in Fufeng county shanxi province from 2002 to 2003.The first debagging date is 16th September, debagging 8 times (once every four days), the lasttime is 14th October. During storing, we studied the effect of bagging on color changing,respiration, content of solids, ratio of weight loss and PGf PPO activity which related to storagein order to detect the most appropriate date of debagging and the effect of bagging on storing.We want to give our dedication to fruit producing in practice and base theory. The results asfollows: 1.The different debagging date has obvious effect on the appearance of fruit. Debaggingfrom September 20th to October 10th,coloring is quick, the later we debagged, the quickerfruit colored. Debagging too early, the fruits' coloring gets slow, and the mature degreedescend; debagging too late, the intensity of light is not sufficient, and the temperature getsdown, so coloring is not well. Within 6 days after removing inter bag, the content ofanthocyanin in peel develops rapidly, during the time of 6~8 days, the appearance of fruit hasbright-colored, luminous, which is the most welcomed by market. 10 days later afterremoving inter bag, the outer quality is getting worse and worse. 2. The different time debagging has no obvious effect on single weight and index of fruitshape. Fruit picked at the same time, with the postponing of picking fruit, its firmness andsoluble solids has a trend of going down, but the differ is not obvious. So bagging Lowerfirmness and the content of soluble solids on the certain degree. 3. The most appropriate debagging time is from September 24th to October 10th in north ofRiver Wei of Shanxi province, the most appropriate picking time is within 6~8 days afterremoving inter bag. So we get that the most appropriate removing outer bag is within 10~12 daysbefore picking. We should get the picking time from market.s need, and then get the removing bagdate from picking time.4. The effect of bagging on storing include several aspects: The anthocyanin is easy toResolve and fruit peel get yellow if coloring time is short; Ethylene and respiration summit ofthe bagged apple rise at some degree, but the time of reaching respiration summit is notchanged; We did not find the difference from relative membrane permeability and the contentof MDA at the earlier time during storing, after 4~5 months later, the relative membranepermeability and MDA of bagged fruit is larger than CK.s, and be obvious at 0.05 degree byanalyzing; 5.The bagged fruit is easy to brown in later time of storage, and also be obvious at 0.01degree, The capacity of containing water of thinner peel of bagged fruit gets less, so it iseasier to lose water. We conclude that bagged apple was worse in storage than CK fromrespiration, PPO and over oxidize degree of lipo-membrane, but not show the difference inPG activity and hardness.