期刊
MINERALS ENGINEERING
卷 128, 期 -, 页码 230-237出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.mineng.2018.09.002
关键词
Biofertilizers; Mineral characterization; Phosphate rock; Nanocomposite; Aspergillus niger
资金
- FAPESP (Sao Paulo State Research Foundation) [2013/11821-5, 2016/09343-6, 2016/10636-8, 2017/11149-6]
- CNPq (Brazilian National Council for Scientific and Technological Development) [142348/2014-7]
- CAPES (Coordination for the Improvement of Higher Education Personnel)
- Agronano Network (Embrapa Research Network)
- Agroenergy Laboratory
- National Nanotechnology Laboratory for Agribusiness (LNNA)
The use of natural phosphate rock as a source of phosphorus for plant growth is considered more environmentally friendly, compared to conventional chemical fertilizers. However, the very low solubility of the phosphate present in natural rocks limits its practical application. To overcome this limitation, a composite was developed based on the dispersion of nanoparticulate phosphate rock in a polysaccharide matrix of starch, as an integrated strategy to facilitate application and provide a supporting substrate for an acidulant microorganism, Aspergillus niger. The bioactivation of the nanocomposite resulted in a remarkable solubilization of up to 70% of the total available phosphate in very low solubility phosphate rocks (Bayovar and Itafos) and 100% of the total available phosphate in a reference mineral (hydroxyapatite), in only 96 h. Such approach employing bioactivation of starch-phosphate rock nanocomposites significantly contributed to improve P-solubilization, opening new routes for the development of smart fertilizers based on polysaccharide matrix.
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