Please use this identifier to cite or link to this item:
https://hdl.handle.net/2440/82051
Citations | ||
Scopus | Web of Science® | Altmetric |
---|---|---|
?
|
?
|
Type: | Journal article |
Title: | Sequestration of phosphorus-binding cations by complexing compounds is not a viable mechanism to increase phosphorus efficiency |
Author: | Degryse, J. Ajiboye, A. Armstrong, R. McLaughlin, M. |
Citation: | Soil Science Society of America Journal, 2013; 77(6):2050-2059 |
Publisher: | Soil Sci Soc Amer |
Issue Date: | 2013 |
ISSN: | 0361-5995 1435-0661 |
Statement of Responsibility: | Fien Degryse, Babasola Ajiboye, Roger D. Armstrong, Mike J. McLaughlin |
Abstract: | There is increasing interest in enhancing the efficiency of P fertilizers or mobilizing fixed P from soil. Cation-complexing ligands are claimed to increase availability of fertilizer-applied or soil P through sequestration of cations (Fe, Al, Ca) that bind P strongly. We assessed the effect of ligand addition on mobility and availability of P in four soils, using a large range of cation-complexing compounds, in batch experiments without or with added P, and found only small effects of these compounds on P solubility. Selected compounds, including two commercial polymer coatings, coated on granular monoammonium phosphate (MAP) and an organic-complexed form of single superphosphate (SSP) fertilizer were tested in diffusion experiments and in a pot trial and compared with conventional MAP or SSP. The ligand treatments, at a 1% coating rate on granular fertilizers, did not significantly affect P diffusion. The only significant difference was between the MAP and SSP treatments, with a lower rate of diffusion from SSP, presumably because of enhanced Ca-P precipitation. Only at very high, commercially unrealistic coating rates (up to 100%) of a dicarboxylic copolymer did P solution concentrations close to the granule increase in an Oxisol, but not in a calcareous soil. The pot trial also showed no effect of the ligand treatments at a 1% coating rate in any of the three soils tested. These results, as well as theoretical considerations, indicate that complexation of P-binding cations is unlikely to be an economically viable process to either release P from stored forms in soil or to increase efficiency of added fertilizer P. © Soil Science Society of America. All rights reserved. |
Rights: | Copyright © by the Soil Science Society of America, Inc. |
DOI: | 10.2136/sssaj2013.05.0165 |
Published version: | http://dx.doi.org/10.2136/sssaj2013.05.0165 |
Appears in Collections: | Agriculture, Food and Wine publications Aurora harvest |
Files in This Item:
There are no files associated with this item.
Items in DSpace are protected by copyright, with all rights reserved, unless otherwise indicated.