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https://hdl.handle.net/2440/90001
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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 (Washington), 2015; 49(6):3427-3434 |
Publisher: | American Chemical Society |
Issue Date: | 2015 |
ISSN: | 0013-936X 1520-5851 |
Statement of Responsibility: | 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 |
DOI: | 10.1021/es504643f |
Published version: | http://dx.doi.org/10.1021/es504643f |
Appears in Collections: | Agriculture, Food and Wine publications Aurora harvest 7 |
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