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Type: Journal article
Title: Natural colloidal P and its contribution to plant P uptake
Author: Montalvo, D.
Degryse, F.
McLaughlin, M.
Citation: Environmental Science and Technology, 2015; 49(6):3427-3434
Publisher: American Chemical Society
Issue Date: 2015
ISSN: 0013-936X
Statement of
Daniela Montalvo, Fien Degryse and Mike J. McLaughlin
Abstract: Phosphorus (P) bioavailability depends on its concentration and speciation in solution. Andisols and Oxisols have very low soil solution concentration of free orthophosphate, as they contain high concentrations of strongly P-sorbing minerals (Al/Fe oxyhydroxides, allophanes). Free orthophosphate is the form of P taken up by plants, but it is not the only P species present in the soil solution. Natural colloidal P (P associated with Al, Fe, and organic matter of sizes ranging from 1-1000 nm) constitutes an important fraction of soil solution P in these soils; however, its availability has not been considered. We measured the uptake of P by wheat (Triticum aestivum) from radiolabeled non-filtered (colloid-containing) and 3-kDa filtered (nearly colloid-free) soil-water extracts from Andisols and Oxisols. In the Andisol extracts, P uptake was up to five-fold higher from the non-filtered solutions than the corresponding 3-kDa filtered solutions. In the Oxisol extract, no difference in P uptake between both solutions was observed. Also the diffusional flux of P as measured with the DGT technique was larger in the non-filtered than in the 3-kDa filtered solutions. Our results suggest that colloidal P from Andisols is not chemically inert and contributes to plant uptake of P.
Keywords: Plants; Triticum; Phosphates; Phosphorus; Soil; Colloids; Solutions; Filtration; Biological Availability
Rights: © 2015 American Chemical Society
RMID: 0030023414
DOI: 10.1021/es504643f
Appears in Collections:Agriculture, Food and Wine publications

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