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Observations on the zinc deficiency of apple trees



Observations on the zinc deficiency of apple trees



Compt Rend Acad Agric France 35(15): 624-626



Deficiency of Zn in apple trees planted in sandy soil fertilized exclusively with N, P, K mineral fertilizer, manifests itself through appearance of leaf-rosettes beginning from the buds. These leaves are much smaller and narrower than normal leaves, undulate on the edges and dull green. The detn. of Zn by the dithizone method shows that the leaves of healthy trees contain twice as much Zn as similar leaves of affected trees. The ailing trees can be improved by the appln. 5% ZnSO4 soln.

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Accession: 025130955

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