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This article in SSSAJ

  1. Vol. 36 No. 5, p. 789-794
    Received: Feb 9, 1972
    Accepted: May 16, 1972

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Uptake of Phosphorus by Plants Growing Under Field Conditions: II. Computed and Experimental Results for Corn Plants1

  1. B. Bar-Yosef,
  2. E. Bresler and
  3. U. Kafkafi2



Fluxes of P uptake by corn (Zea mays L.) plants growing in the field under high and low P fertilization levels, were both predicted by an uptake model, and obtained experimentally in the field by a new technique.

The computed fluxes were averaged over a period of 1 week to give values of 4.8 × 10-5 and 1.7 × 10-5 µg P cm-2 sec-1 at the high and low P levels in the soil, respectively. These values were lower than the experimental weekly average fluxes which, at the critical growth period (between the 5th and 7th weeks), equaled about 6.8 × 10-5 and 2.5 × 10-5 µg P cm-2 sec-1, correspondingly. The deviation of the real conditions prevailing in the field from those assumed in the model tended, qualitatively, to explain the discrepancy.

It is shown that the computed flux of P uptake is more sensitive to variations in the soil than in the plant parameters.

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