Lignin-based coatings for controlled P-release fertilizer consisting of granulated simple superphosphate
| Autor: | Leandro Cantera, Ignacio Di Pascua, Andrés Dieste, Leonardo Clavijo, Felipe Rotondo, Rodrigo Coniglio |
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| Rok vydání: | 2018 |
| Předmět: |
040101 forestry
0106 biological sciences Industrial chemistry 04 agricultural and veterinary sciences engineering.material 01 natural sciences Biomaterials chemistry.chemical_compound chemistry Chemical engineering Simple (abstract algebra) 010608 biotechnology engineering 0401 agriculture forestry and fisheries Lignin Fertilizer |
| Zdroj: | Holzforschung. 72:637-643 |
| ISSN: | 1437-434X 0018-3830 |
| DOI: | 10.1515/hf-2017-0176 |
| Popis: | A novel lignin-based slow release fertilizer with low environmental impact has been developed. More precisely, a granulated simple superphosphate fertilizer, consisting of calcium phosphate monobasic [Ca(H2PO4)2·H2O] and gypsum (CaSO4·2H2O) was coated with modified kraft lignins and the diffusion of phosphorus was observed as a function of time. The lignin was hydroxymethylated with formaldehyde and subsequently cross-linked with phenol-formaldehyde resin resulting in HML-PF as coating. Moreover, coating films were prepared from a mixture of acetylated lignin (Lac) and acetylated cellulose (Cellac). Both coatings show similar permeability to calcium phosphate and controlled effectively the P-release, particularly at the initial stages of the experiment. The P-release was linear in the decay phase but there is no lag time in the process. A significant P amount was not released from the particles coated with HML-PF, i.e. 80–50% remained irreversible bound, depending on the coating formulation. The maximum fractional P-release varied among the different coatings tested. Phosphorus is partly retained inside the slightly soluble calcium sulfate matrix. |
| Databáze: | OpenAIRE |
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