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《Northern Horticulture》 2010-04
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Effect of Foliage Top-dressing of Potassium on the Photosynthetic Rate of Apple Trees

XU Li-xiang1,TANG Xue-dong2,LIU Xiao-jia2(1.College of Forestry,Northeast Forestry University,Harbin,Heilongjiang 150040;2.College of Horticulture,Jilin Agricultural University,Changchun,Jilin 130118)  
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.
【Fund】: 国家自然科学基金资助项目(40271069 40471076);; 高校博士点基金资助项目(20040193002)
【CateGory Index】: S661.106.2
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