Agronomic effectiveness of granulated and powdered P-exchanged Mg-Al LDH relative to struvite and MAP
Date
2017
Authors
Everaert, M.
Degryse, F.
McLaughlin, M.J.
De Vos, D.
Smolders, E.
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Journal article
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Journal of Agricultural and Food Chemistry, 2017; 65(32):6736-6744
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Maarten Everaert, Fien Degryse, Mike J. McLaughlin, Dirk De Vos, and Erik Smolders
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Abstract
Layered double hydroxides (LDHs) used to recover P from wastewater have recently been proposed as new slow-release fertilizers. Here, the use of P-exchanged Mg-Al LDHs as powdered or granulated fertilizer is explored and compared with monoammonium phosphate (MAP), a fully water-soluble fertilizer, and with struvite, a recycled phosphate fertilizer with lower solubility. First, these three fertilizers were compared in a 100-day incubation experiment using P diffusion visualization and chemical analysis to assess P release from either granules or powdered fertilizer in three different soils. By the end of the incubation, 74-90% of P remained within the LDH granule, confirming a slow release. Second, a pot experiment was performed with wheat (Triticum aestivum) in an acid and a calcareous soil. The granular treatment resulted in a considerably higher P uptake for MAP compared to LDH and struvite. For the powder treatments, the P uptake was less than for granular MAP and was largely unaffected by the chemical form. The LDHs and struvite showed a lower agronomic effectiveness than granular MAP, but the benefits of their use in P recycling, potential residual value, and environmental benefits may render these slow-release fertilizers attractive.
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© 2017 American Chemical Society