| Bagging for apple can improve coloring, make fruit luminous, reduce remain of agrochemical and increase price in market. Debagging date has a important effect on the quality of fruit. A different debagging experiment for short-branch (Red Fuji( apple was conducted 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 last time is 14th October. During storing, we studied the effect of bagging on color changing, respiration, content of solids, ratio of weight loss and PG,PPO activity which related to storage,in 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 as follows: 1.The different debagging date has obvious effect on the appearance of fruit. Debagging from September 20th to October 10th,coloring is quick, the later we debagged, the quicker fruit colored. Debagging too early, the fruits' coloring gets slow, and the mature degree descend; debagging too late, the intensity of light is not sufficient, and the temperature gets down, so coloring is not well. Within 6 days after removing inter bag, the content of anthocyanin in peel develops rapidly, during the time of 6~8 days, the appearance of fruit has bright-colored, luminous, which is the most welcomed by market. 10 days later after removing 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 fruit shape. Fruit picked at the same time, with the postponing of picking fruit, its firmness and soluble solids has a trend of going down, but the differ is not obvious. So bagging Lower firmness 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 of River Wei of Shanxi province, the most appropriate picking time is within 6~8 days after removing inter bag. So we get that the most appropriate removing outer bag is within 10~12 days before picking. We should get the picking time from market(s need, and then get the removing bag date from picking time. 4. The effect of bagging on storing include several aspects: The anthocyanin is easy to Resolve and fruit peel get yellow if coloring time is short; Ethylene and respiration summit of the bagged apple rise at some degree, but the time of reaching respiration summit is not changed; We did not find the difference from relative membrane permeability and the content of MDA at the earlier time during storing, after 4~5 months later, the relative membrane permeability and MDA of bagged fruit is larger than CK(s, and be obvious at 0.05 degree by analyzing; 5.The bagged fruit is easy to brown in later time of storage, and also be obvious at 0.01 degree, The capacity of containing water of thinner peel of bagged fruit gets less, so it is easier to lose water. We conclude that bagged apple was worse in storage than CK from respiration, PPO and over oxidize degree of lipo-membrane, but not show the difference in PG activity and hardness. |
PDF Full Text Request