Abstract
MAGNESIUM chlorosis is widespread among tomatoes grown under glass in Great Britain. It probably causes a condsiderable loss of yield, and economic methods for its correction are therefore urgently required. D. J. D. Nicholas shows (J. Hort. Sci., 24, No.1, 1–18 ; June 1948) that this can best be accomplished by sprays of two per cent of magnesium sulphate applied to the foliage five times at intervals of two or three weeks. This results in the application of less than 5 cwt. per acre, compared with 10-20 cwt. of calcined kieserite, found necessary for soil applications. Soil factors probably immobilize a large proportion of the soil dressings of magnesium sulphate. Interactions of magnesium with potassium and nitrogen are also discussed in the paper.
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Correction of Magnesium Deficiency in Tomatoes. Nature 163, 633 (1949). https://doi.org/10.1038/163633c0
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DOI: https://doi.org/10.1038/163633c0