期刊
ACS SUSTAINABLE CHEMISTRY & ENGINEERING
卷 5, 期 10, 页码 9043-9052出版社
AMER CHEMICAL SOC
DOI: 10.1021/acssuschemeng.7b01935
关键词
Impregnation; Compound biochar; P-release kinetics; P use efficiency; Oxisol
资金
- Fundacao de Amparo a Pesquisa do Estado de Minas Gerais-FAPEMIG [CAG-APQ-00484-14]
- Coordenacao de Aperfeicoamento de Pessoal de Nivel Superior-CAPES [PROEX AUXPE 590/2014]
- CAPES
- Conselho Nacional de Desenvolvimento Cientifico e Tecnologico-CNPq [303899/2015-8]
Monoammonium phosphate (MAP), triple superphosphate (TSP), and phosphoric acid (H3PO4), with and without the addition of magnesium oxide (MgO), were mixed with poultry litter (PL) to produce biochar-based fertilizers (BBFs). This is a novel approach aiming to add value to PL residue and to increase P use efficiency in acidic tropical soils. Samples of BBFs were assessed by P-release kinetics in water, Xray diffraction (XRD), Fourier transform infrared spectroscopy (FTIR), and a bioassay with maize in a greenhouse using a clayey Oxisol. Addition of MgO reduced the kinetics of P released from BBFs impregnated with all P sources. XRD analysis showed the formation of low-solubility Ca2P2O7 and Mg2P2O7 compounds, which is supported by P-O-P or P=O stretching observed in the FTIR spectra. The MgO-treated BBFs increased shoot dry matter production compared to the control, but were inferior when compared to TSP in the short term. The slow release of P and the alkaline reaction of the BBFs show great potential for these materials to be used as enhanced P fertilizers in tropical soils.
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