Journal
BIORESOURCE TECHNOLOGY
Volume 101, Issue 11, Pages 4120-4124Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.biortech.2009.12.057
Keywords
Aspergillus sp.; Cassava wastes; Phosphate biofertilizer
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Two fungi characterized as Aspergillus fumigatus and Aspergillus niger, isolated from decaying cassava peels were used to convert cassava wastes by the semi-solid fermentation technique to phosphate biofertilizer. The isolates solubilized Ca(3)(PO(4))(2), AlPO(4) and FePO(4) in liquid Pikovskaya medium, a process that was accompanied by acid production. Medium for the SSF fermentation was composed of 1% raw cassava starch and 3% poultry droppings as nutrients and 96% ground (0.5-1.5 mm) dried cassava peels as carrier material. During the 14 days fermentation, both test organisms increased in biomass in this medium as indicated by increases in phosphatase activity and drop in pH. Ground cassava peels satisfied many properties required of carrier material particularly in respect of the organisms under study. Biofertilizer produced using A. niger significantly (p < .05) improved the growth of pigeon pea [Cajanus cajan (L.) Millsp.] in pot experiments but product made with A. fumigatus did not. (C) 2009 Elsevier Ltd. All rights reserved.
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