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Conversion of Agro-Wastes into Bio-Fertilizer by Anaerobic Digestion for Soil Fertility Enhancement

Authors

  • Majolagbe Olusola Nathaniel Microbiology Unit, Ladoke Akintola University of Technology
  • Abiodun Ayandele Microbiology Unit, Ladoke Akintola University of Technology
  • Iyabo Olunike Omomowo Microbiology Unit, Ladoke Akintola University of Technology
  • Elijah Adegoke Adebayo Microbiology Unit, Ladoke Akintola University of Technology

Abstract

There is a continuous demand for bio-fertilizer to improve the soil fertility and increase food production. Wastes were collected from eateries, food canteens, domestic houses and agricultural outlets. Five experimental set-ups were made using different combinations of digested wastes as follows: pig waste (Pw), cassava wastes (Cw), food wastes (Fw); pig waste + cassava waste (Pw+Cw), pig waste + Food wastes (Pw+Fw). The slurry of each category of bio-product were prepared by addition of appropriate volume of water, incubated for 70days with intermittent agitation at regular intervals in the digester. The principal bacteria which took the most active role in the bioconversion process were identified to be P. aeruginosa and Bacillus spp. Comparative evaluation of each of the digested category of slurry combinations showed variations in their nitrogen content as follows: Pw (1.70± 0.03 mg/100g), Cw (0.61±0.02mg/100g), Fw (1.96±0.03mg/100g), Pw+Cw (1.20±0.01mg/100g), Pw+Fw (2.10± 0.02mg/100g). Pw+Fw showed highest K, P and Mg concentrations as 66.72± 2.36 mg/100g, 143.36± 2.36 mg/100g and 53.34±2.36 mg/100g respectively.The elemental composition in the increasing order in each of the slurry waste as follows: Cw<Fw< Pw <Pw+Cw<Pw+Fw There were shifts in the pH which could be due to metabolic activities and microbial interaction between the soil, other its component and added digested waste. The best performance in mineral content and plant growth noticed in Pw+Fw could be due to the nearness to neutrality of its pH.

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Posted

2020-01-14

Section

Under Review

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Copyright (c) 2020 Abiodun Ayandele, Majolagbe Olusola Nathaniel, Iyabo Olunike Omomowo, Elijah Adegoke Adebayo

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