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Effect of Adsorbed Cations on Phosphorus Absorption by Various Plant Species 1
Author(s) -
Franklin R. E.
Publication year - 1970
Publication title -
agronomy journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.752
H-Index - 131
eISSN - 1435-0645
pISSN - 0002-1962
DOI - 10.2134/agronj1970.00021962006200020011x
Subject(s) - chemistry , salt (chemistry) , phosphorus , absorption (acoustics) , adsorption , inorganic chemistry , ion exchange , membrane , chloride , sodium , ionic strength , cation exchange capacity , nuclear chemistry , ion , aqueous solution , biochemistry , soil water , organic chemistry , physics , acoustics , environmental science , soil science
Abstract P uptake by excised roots of 10 different plant species was found to be stimulated by a short pretreatment with polyvalent cations, or by raising the ionic strength of the absorbing solution. The pretreatment consisted of a l‐min rinse with 10 −3 N chloride salt solutions prior to exposure to 2 × 10 −5 M KH 2 PO 4 . Also, the root CEC was estimated by isotopic exchange using a labeled CaCl 2 solution. The stimulation of P uptake by the polyvalent cation pretreatments was significantly correlated with the amount of P taken up by the control and the root cation exchange capacities. The results supported the hypothesis that the cell wall can act act as a negatively charged membrane regulating P uptake.