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

ABSTRACT

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 x 10^-5 and 1.7 x 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 x 10^-5 and 2.5 x 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.

¹ Contribution from The Volcani Center, Agr. Res. Org., Bet Dagan, Israel. 1972 Series, No. 2055-E.

² Soil Chemist, Soil Physicist, and Soil Chemist, respectively.

Received for publication February 9, 1972. Accepted for publication May 16, 1972.