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This article in AJ

  1. Vol. 62 No. 6, p. 818-821
    Received: May 29, 1970

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The Effects of Potassium on Ammonium Nutrition of Tomato (Lycopersicon esculentum Mill.)1

  1. O. Ajayi,
  2. D. N. Maynard and
  3. A. V. Barker2



Tomato plants (Lycopersicon esculentum Mill.) grown in pot culture in the greenhouse were easily injured by continuous, prolonged application of (NH4)2SO4. When an equivalent amount of K was supplied with the NH4, plant injury due to excessive NH4 was prevented. The presence of K in the NH4 culture system enhanced growth and restricted total N and NH4-N accumulation. The magnitude of the restriction of N constituents suggests that the ameliorating K effect was due in part to a K:NH4 competition for uptake but principally to the enhancement of NH4 assimilation.

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