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Variations of the Contents the Mineral Elements in Leaves of Virus-free Apple Trees

LIU He,ZHAO Cai-ping,QIN Guo-xin,ZHANG Yu-long(College of Horticulture,Shanxi Agricultural University,Taigu 030801,China)  
In this experiment,the variations of the contents of the mineral elements in leaves at early period of fruiting had been studied.The results were shown as follows:①The tendencies of the developmental variation of the contents of mineral elements of leaves between virus-free and virus-infected trees of Starkrimson,Fuji and Golden Delicious were basically identical during growing period.②During the growing season,there were differences of the contents of mineral elements in leaves between virus-free and virus-infected apple trees.③The difference of the contents of mineral elements in the leaves of virus-infected was related to the difference of varieties,which showed that the effect of freeing virus on Starkrimson were greater than other varieties.④ The effect of freeing virus on the contents of trace elements were greater than that of major elements.
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