Effect of Sulphate on Lemon Leaves

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Abstract
In controlled sand cultures large concentrations of sulphate in the solution bathing lemon tree roots may bring about toxic effects in the leaves. These effects are characterized by mottling with a yellow or bronzed coloration and sometimes burning of these areas, accompanied by marked abscission of the leaves. In sand cultures a reduction in toxicity due to sulphate was brought about by increased concentrations of phosphate and nitrate. Field in-vestigations upon lemon leaves confirmed observations with sand cultures. There is no one general optimum concentration of nitrate for the growth of citrus, but the desirable concentration depends upon many factors, such as the concentration of other constituents of the soil solution and their ease of renewal. Irrigation supplies that are rich in sulphate may cause more or less injury to lemon trees, especially where the available N is insufficient.