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中文摘要：
采用GPS-1便携式光合作用测定系统，研究Kg苹果树生育期根外施K对其光合速率的影响。结果表明：Kq苹果树光合速率日变化呈双峰曲线，且根外施K处理叶片净光合速率（Pn）明显高于对照，在一定程度可缓和“午休”现象，每次喷钾的作用可持续25d左右。并且3次根外施K处理叶片光合速率明显高于根外1次施K和2次施K处理。
英文摘要：
The effect of top-dressing of potassium on photosynthetic rate of apple trees in growth period were studied by GPS-1 portable photosynthesis system. The result showed that diurnal variations of the photosynthec rate of K9 apple trees emerged double peak curves. The photosynthetic rate of leaves of foliage top-dressing was higher than control obviously. Photosynthetic midday depression phenomenon was relaxed to a certain extent,and the effects will be kept up for twenty-five days after every spraying of potassium. In all growth period, the effect spring three times were better than spring one times and two times.
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