Abstract: The bagging technique has been applied wildly in fruit production, especially for Fuji apples with a bagging rate of over 75% in main production areas of both Shandong and Shaanxi. 8 000 - 18 000 bags have been used annually, costing 270 - 1 100 yuan per 667 m². The cost took up 1/3 of the total investment and 45% of production material input. The labor cost in bagging and bag-removing accounted formain sector of the total labor cost. Therefore, the bagging has strongly influenced the structure of p roduction investment.In the research on photosynthesis of bagged apple trees, itwas found that a bag could cause the shading of 5 leaves nearby, with the Pn values of the shaded leaves being negative. Mass bagging could reduce the photosynthetic ability of the middle and interior parts of the canopy very significantly. It iswise to apply the bagging technique based on both the market demand and local production conditions.

Key words: Apple, Bagging, Investment, Cost, Shading