Co-Composting Urban Waste,Plant Residues,and Rock Phosphate: Biochemical Characterization and Evaluation of Compost Maturity |
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| Authors: | U A Naher M I U Sarkar A Jahan J C Biswas |
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| Institution: | 1. Soil Science Division, Bangladesh Rice Research Institute, Gazipur, Bangladeshnaher39@gmail.com;3. Soil Science Division, Bangladesh Rice Research Institute, Gazipur, Bangladesh |
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| Abstract: | Co-composting of urban wastes (UWs) and plant residues with rock phosphate (RP) produces quality compost and reduces the use of chemical phosphorus fertilizer. Biochemical process of three compost piles (P): P1- 50% UW + 30% rice straw (RS) + 10% sawdust (SD) + 8% RP + 2% sugarcane trash (ST), P2- 50% UW + 23% RS + 10% SD + 15% mustard oil cake + 2% ST, and P3- 95% UW + 5% RP was studied. Decomposition rate followed first-order kinetics and maximum (77%) was in P3. The highest bacterial population was found in P2 having higher cumulative CO2 evolution (53.76 mg CO2 g?1 volume solid). Prevalence of phosphate-solubilizing bacteria was 2.0 to 6.3 Log10 Cfu g?1 dry weight and concentrated in RP-amended piles. Humic acid of compost was classified as rotteprudukte. Final pH (7.5 to 8.0) and germination index (>90) proved that the compost was mature. P3 compost (1 t ha?1, fresh weight) had potential to supply 25 kg phosphorus. |
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| Keywords: | Bacteria population compost maturity decomposition rate germination index humic acid rotteprudukte |
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