NUTRITIONAL PROBLEMS
Because of the increasing shortage of barnyard
manure and the growing expansion of citrus
plantings, nutritional problems are present and
mily be expected to get worse. Many
groves show foliar symptoms of a deficiency
in zinc, iron, and manganese. Whenever
barnyard manures are supplemented by
fertilizers, the mixture consists only of
nitrogen, phosphorus, and potassium. It is
not known to what extent elements are tied up in the soil because of high pH values.
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