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Uptake of Phosphorus by Plants Growing Under Field Conditions: I. Theoretical Model and Experimental Determination of its Parameters
Author(s) -
BarYosef B.,
Kafkafi U.,
Bresler E.
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/sssaj1972.03615995003600050028x
Subject(s) - phosphorus , diffusion , allowance (engineering) , flux (metallurgy) , soil science , chemistry , phosphate , agronomy , environmental science , thermodynamics , physics , biology , mechanical engineering , engineering , organic chemistry
A model for P uptake by plants growing in the field or under controlled growth conditions was developed. The model makes allowance for the apparent diffusion coefficient of P in the soil ( D ), and the biologically determined parameter relating flux to concentration (α) to be concentration‐dependent. The values of D ( C ) and α( C ) were determined directly by new laboratory techniques. The phosphate soil diffusion coefficient ( D p ) was practically independent of concentration when the volumetric water contents (θ) of the soil was 0.40. When θ was 0.57, the dependence of D p on concentration increased. The dependency of α( C ) on the age of a unit root surface area of corn ( Zea mays L.) was taken into consideration in the model.