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    Zinc deficiency on walnut

    A case of severe zinc deficiency on a walnut orchard in the area of Kavala in N. Greece. The deficiency already caused necrosis and fall of a large percentage of the foliage which is expected to induce quantitative and qualitative loss in walnut production.

    Usually zinc deficiency appears in acidic and zinc-poor soils, in light soils which are poor in organic matter, in calcareous soils which cause drop of zinc solubility in the soil solution and in cases where phosphorus fertilizers were used in excess.

    Author/photos: Aris Chloridis

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