充足的光照条件 ,有利于叶片光合作用和果面着色。光照可直接诱导花青素的形成 ,特别是在果实成熟前 6周内 ,日光直射量与红色发育高度相关 :当果实获全日照的 70 %时 ,果面全红 ;获全日照的50 %时 ,果面部分着色 ;获全日照的 4 0 %以下时果面不着色。所以在果树生产中必须特别 Adequate light conditions, is conducive to leaf photosynthesis and fruit coloring. Light can directly induce the formation of anthocyanins, especially in the 6 weeks before the fruit ripening, the direct sunlight is highly correlated with the red development: When the fruit is 70% of the full sun, the fruit is red, and the full sunlight is 50% When the fruit surface partially colored; 40% of the full sun when the fruit surface is not colored. So in the production of fruit trees must be special