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Uptake of Phosphorus by Plants Growing Under Field Conditions: II. Computed and Experimental Results for Corn Plants
Author(s) -
BarYosef B.,
Bresler E.,
Kafkafi U.
Publication year - 1972
Publication title -
soil science society of america journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.836
H-Index - 168
eISSN - 1435-0661
pISSN - 0361-5995
DOI - 10.2136/sssaj1972.03615995003600050029x
Subject(s) - phosphorus , human fertilization , flux (metallurgy) , zea mays , zoology , agronomy , field corn , nitrogen , plant growth , environmental science , chemistry , biology , organic chemistry
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.