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《Journal of Shandong Agricultural University》 1993-01
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Qu Guimin, Huang Tiandong, Gu Manru (Dept. of Horticulture, Shandong Agric. Univ., Taian, China 271018)  
Two cultivars, the 20-yr-old'Starking' and'Liao Fu'apple trees, were used as material in the experiment. The content of zinc and root vigour of diseased and healthy plants were measured. The annual variations of zinc in different organs and rhizosphere soil were investigated. The relation between the content of zinc in roots and root vigour was also studied. The results were as follows: (1) The content of zinc in abnormal leaves was apparently less than that in normal ones. There were two times when much more zinc was measured in normal leaves, i.e. at the beginning of growth of spring and autumn shoots, but there was only one time for zinc to get peak level in abnormal ones, at the stage of rapid growth of spring shoots. The content of zinc in roots of diseased trees was no less than that in ones of normal trees. (2) Under the same soil conditions, there was no significant difference between the root vigour of diseased trees and that of normal trees. (3) Under conditions of sufficient content of available zinc in soil, the content of zinc in roots was not entirely dependent on the root vigour.
【CateGory Index】: S661.1
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