Effects Of Light Environment On Fruit Appearance Quality Of Red Fuji Apple

This research takes Fuji apple in Aksu as the test materials and analyses several aspects such as thephotosynthetic characteristics at varies periods, change patterns of humidity and temperature,characteristics of internal crown and effective radiation of two shapes of Fuji apple tree; Meanwhile, theeffect of light environment on color deveiopment of Fuji apple is sdudied too. The results are as follows:1. There is a significant difference of the net photosynthetic rate between the two shapes of Aksu RedFuji apple on a clear day, its value in both typical bimodal curve pattern, the peak value appeared in about13:00o’clock and17:00o’clock with photosynthetic Noon Break phenomenon at midday. May to July,subjective stratification tree photosynthesis than spindle tree photosynthesis.2. The diurnal variations of apple PAR of both tree shapes presented a similar bimodal curve in mayand June, and the peak appeared in13:00PM. Yet, the pattern in July showed a unimodal curve andreached its maximum at noon. The PAR in apples from subjective stratification tree was always higher thanthat in spindle tree during May to August.3. The leaf area index and the light transmittance showed two opposite tendencies, the LAI of theperiphery of those two shapes trees showed a obvious trend that first rises then declines; The LAI of crownbore maintains a rising tendency both Peripheral and bore LAI in spindle tree were always higher thanthose in subjective stratification tree, the Peripheral light transmittance of two shapes of tree presented atrend of rises and then declines; the Bore light transmittance of subjective stratification tree showed aunobvious trend of first rises then declines, the light transmittance of spindle tree continued to declinerelatively higher, the light transmittance in Peripheral and bore of subjective stratification tree are higherthan apples from spindle tree.4. Under the conventional managements, apples from subjective stratification tree has many meritsthan those from trees of spindle tree, such as the single fruit weight, the contents of total soluble solids,vitamin C, total acid, total sugar and reducing sugar; However, spindle tree has a higher yield thansubjective stratification tree, the acre yield of subjective stratification tree is, based on single plant yield.5. Exterior fruit quality was significantly improved after bagging. The bagged fruit skin gloss,cleanness and color were better than no bagged fruit and the fruit spots were obviously less than no baggedfruit. It is suggested that bagging could also decrease the internal fruit quality. The fruit size, soluble solids,total acid, total sugar and Vitamin C were less in bagging treatments and have no obvious influence onshape index. Picking off leaves and turn fruit and spread reflective film can be improve the fruit coloring to99%(mature fruit), at the same time that measures can be improve soluble solids, total acid, reducing sugar,total sugar and Vitamin C. Picking off leaves and turn fruit and spread reflective film can solve the problemthat simple bagging effect internal fruit quality the same time can solve the color decrease after bagging.