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在苹果采收前一个月的8月5日,我们选择有代表性的红星苹果树下铺银膜(聚乙烯或聚二乙烯加银灰色金属粉末而成)。从铺膜当天起定株取样分析果实,每隔一周分析一次,直至采收止。采用蒽酮比色法测定可溶性糖和淀粉含量,用稀碱微量滴定法测定可滴定酸度,用2,6-二氯酚靛酚微量滴定法测定维生素C,用折光仪测定可溶性固形物。实验表明:红星苹果树下铺膜能提高地面反光率,改善内膛果、枝的光照条件,增加下部叶片的光合作用,促使内膛果提前着色。如内膛全红果比对照多2%,3/4红果比对照多11%,1/2红果较对照多5%。1/4着色果比对照少10%,未着色果只有0.5%,较对照少7%。内膛外围果的全着色果比对照提高2%,3/4红果比对照提高23%。铺膜前期含糖量比对照低3.2％,铺膜29天后,
On August 5 of the month before the apple harvest, we selected a representative silver tree under the Red Apple tree (polyethylene or polyethylene plus silver gray metal powder). From the day of filming plant samples taken from the analysis of fruit, once every other week until harvesting only. Soluble sugar and starch content were determined by anthrone colorimetric method. Titratable acidity was determined by dilute alkali microtitration. Vitamin C was determined by 2,6-dichlorophenolindophenol microtitration method. Soluble solids were determined by refractometer. Experiments show that: the film under the Red Star apple tree can improve the surface reflectance, improve the inner borer, branches of the light conditions, increase the lower part of the leaves of photosynthesis, prompting the pre-coloring of the inner borer. For example, 2% more red berries were found in the bore, 11% more red berries than 3/4 fruits and 1% more red berries than the control. 1/4 of the colored fruit is 10% less than the control, 0.5% of the uncolored fruit is 7% less than the control. The whole coloration of the inner peripheral fruit increased by 2% compared with the control, while 3/4 red fruits increased by 23% compared with the control. Film pre-sugar content was 3.2% lower than the control, film 29 days,