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Nickel

Mouse-ear or little-leaf disorder in pecan trees is a symptom of nickel deficiency, according to American fruit specialists. The same symptoms are found in river birch and some other woody perennials. A high cation concentration in the soil is supposed to be a primary cause of this replant disease. In potted greenhouse grown pecan trees the disorder is induced by addition of high amounts of Cu, Fe, Mn or Zn to the potting mix. In practice, Ni deficiency is also associated with excessive soil Ca en Mg content. The fruit specialists think the possibility of Ni deficiency as a part of replant problems in woody perennials is underestimated.

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© Gert van den Berg 2012