苹果是特别需光的作物,尤其是富士苹果需光更多。当树冠枝数过多时,因透光性差,芽弱小,“针状”枝增多,对果实品质具有不良影响。1975年,用幼树、成龄树5株,测定不同部位的受光量,选60个部位,用东芝照度计(5号型)求算受光指数,在采收期摘其附近果实。结果看出,幼树树冠上部平均受光指数高达83%, Apple is particularly light crops, especially Fuji apple needs more light. When the number of crown branches is too much, because of poor light transmission, bud weak, “acicular” branches increased, the quality of the fruit has a negative impact. In 1975, five young trees and adult trees were used to measure the amount of light received in different locations. 60 sites were selected, and the light-receiving index was calculated with a Toshiba illuminometer (type No. 5). The results showed that the upper part of the sapling upper average light-receiving index as high as 83%