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This article in SSSAJ

  1. Vol. 27 No. 6, p. 671-674
    Received: Jan 16, 1963
    Accepted: Apr 22, 1963

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The Effects of Nitrogen on Short-Term Phosphorus Absorption and Translocation in Corn (Zea Mays)1

  1. C. V. Cole,
  2. D. L. Grunes,
  3. L. K. Porter and
  4. S. R. Olsen2



Short-term P uptake studies were conducted with intact 1-month-old corn plants of differential N and P composition. Supplemental N pretreatments producing increased growth rates and higher levels of N in the plant stimulated the rate of P uptake per unit dry weight of root more than did a tenfold increase in P concentration in the external solution. Nitrogen pretreatments caused five- to tenfold increases in rate of P translocation to the tops during the uptake period. The presence of nitrate or ammonium ions in the test solution during the uptake period had negligible effects on P uptake rates. Phosphorus uptake rates were highly correlated with total N level in the roots. The stimulation of P uptake rates with higher plant N levels suggests a connection between N metabolism and P uptake processes.

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