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This article in AJ

  1. Vol. 61 No. 3, p. 403-405
     
    Received: Oct 5, 1968
    Published: May, 1969


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doi:10.2134/agronj1969.00021962006100030021x

Magnesium-Phosphorus Interrelationships in Tomatoes

  1. Billy W. Hipp and
  2. C. J. Gerard2

Abstract

Abstract

Tomato (Lycopersicon esculentum) plants were grown in nutrient solution with Mg levels which varied from 0.96 ppm to 96 ppm and with P levels of 5 and 31 ppm. At low levels of Mg better growth was obtained when the P level was low. At high levels of Mg better growth was obtained when the P level was high. A nutrient solution containing 96 ppm of Mg promoted plant growth when the P concentration was 31 ppm but reduced growth when the P concentration was 5 ppm. Phosphorus fertilization of tomatoes grown on clay soils reduced the Mg content of the leaves from 1.2 to 0.65%. Analysis of leaves of commercial tomato fields during the late bloom stage showed a negative relationship between Mg and P (r = —0.896).

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