Effects Of Bagging Time On Fruit Quality And Development Of Changfu 2 Apple

The study was taken under the condition of gneiss mountain area in middle-south of Hebei province. In order to reveal(study) the rules(effects) of bagging time on formation of fruit external and internal quality and development of fruit,and provide theoretical basis for producing free-pollutant apple fruit with high quality, the bagging time experiment with double layer paper bag on Changfu2 apple was carried out from 2001-2002 in Fugangshanzhuang of Houjiazhuang country.Neiqiu county.The results were shown as follows.1 Bagging time had remarkable effect on the apple's external quality.To bag early, the content of chlorophll in apple peel was lower, the ratio of anthocyanin to chlorophll + carotenoid was higher, the color of fruit skin was more bright, and fruit skin colored up quickly. To bag late, the contents of anthocyanin and carotenoid were higher.The fruit dots diameter was bigger with the bagging time deferred. The bagging time had no effect on the density of fruit dots.To bag early, the nicks on the peel were less, and the surface was smooth. The wight and size of fruit were decreased with the early bagging time. The fruit shap index was big with the bagging time deferred.2 Bagging time had remarkable effect on the apple's internal quality.The contents of souble solids, total sugar, fructose, glucose and ascorbic acid were increased.the ratio of sugar-acid was declined, and the content of amino acid was declined with the bagging time deferred.Bagging time affected the content of soluble pectin significantly, but didn't affect the protopectin content. The content of soluble pectin decreased gradually and the content of protopectin increased with the bagging time deferred. Fruit hardness increased with the bagging time deferred.Execept K.the contents of Mg, Ca, P, Fe, Mn, Cu, Zn increased with the bagging time deferred.As far as fruit structure was concerned.The strucure of peel was affected by bagging time too.To bag early, both the thickness of cuticular and the carpodermis decreased. Bagging time didn't affect the cell size and cell clearance, but the size of fruit cell became bigger with the bagging time deferred.3 Bagging affected the fruit development. After bagged ,the young fruit grew slowly because of the changed microenvironment. The development recovered normally after bagged 20-30 days later. The fruit size expanded quickly 5-10 days after removed the bag. The contents of IAA% GA,Z(zeatin) in pulp increased quickly after removed the bag 5 to 10 days later. The content of IAA in seeds increased quickly, but the contents of GA and Z(zeatin) in seeds changed slowly after removed the bag 5 days later.4 After studied the effects of bagging time on the external and internal quality and development of fruit, the author considered that the suitable bagging time was after 20 to 40 days of full-bloom stage in gneiss mountain area of middle-south of Hebei province, the fruits which were bagged during this period were more wonderful.the color was bright,the surface was smooth and the taste was well.