我们通过用碘测定果实中淀粉水解程度,确定最适采收期,取得了较好的经济效益。方法是选具有代表性红星苹果2株,每株自8月下旬起连续从各个方位取大小相近有代表性果实10个,分别观测记录着色程度、纵横径、硬度、可溶性固形物。然后将果实自中部横切开,用碘化钾溶液或碘酒染色,? We determined the optimum harvesting period by measuring the degree of starch hydrolysis in fruits and achieved good economic benefits. The method is to select two representative Red Star apples, each of which has 10 representative fruits of similar size and continuous recording from each position since late August, and record the degree of coloring, vertical and horizontal diameter, hardness and soluble solids respectively. Then the fruit is cut transversely from the middle, stained with potassium iodide solution or iodine.