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Microbiological and physicochemical studies of Wetland Soils in Alimosho Lagos Government Area, Lagos, Nigeria

Funmilayo V Doherty; Abdullahi Adeola; Godwin O Ovioma; Idowu A Aneyo; Ruqeeyat O Binuyo.

Abstract
Background: Wetlands are rich in soil nutrients; producing good soil conditions which favor the growth of various vegetation. This study was conducted to examine the microbiological quality and concentration of some major elements of samples from Wetland soils in Alimosho Local Government area in Lagos, Nigeria. The microbiological
and physicochemical characteristics of the wetland soils were studied during the dry season in 2015. Materials and Methods: Total heterotrophic bacterial counts (THBCs) and total fungal counts (TFC) were determined using standard procedures from four locations at 2-20 cm depths during the dry season. Microbial isolates were characterized and identified. Results: Chemical parameters were also determined using ultraviolet-visible spectrophotometer. THBC ranged from 7.0 × 103 cfu/g to 2.0 × 103 cfu/g for the different locations of the site. The THBC for the control site was 5.0 × 103 cfu/g, Site 1 was 2.0 × 103 cfu/g, Site 2 was 7.0 × 103 cfu/g, and Site 3 was 3.0 × 103 cfu/g. TFC ranged from 8.0 × 103 cfu/g to 3.0 × 103 cfu/g for different locations of the site. The TFC for the control site was 4.0 × 103 cfu/g, Site 1 was 3.0 × 103 cfu/g, Site 2 was 8.0 × 103 cfu/g, and Site 3 was 3.0 × 103 cfu/g. Bacillus sp., Staphylococcus sp., Pseudomonas sp., Klebsiella sp., Escherichia coli, Proteus mirabilis, and Streptococcus species which were identified by biochemical test were predominated bacteria, while Aspergillus sp., Penicillium sp., Rhizopus sp., Mucor sp., and Fusarium sp. were identified macroscopically and microscopically as the dominant fungi genera isolated. The physicochemical results showed values which ranged from 1957.33 mg/kg to 2703.88 mg/kg for iron, 122.87 mg/kg to 172.95 mg/kg for zinc, 24,250.12 mg/kg to 31,832.45 mg/kg for potassium, 8078.48 mg/kg to 12,269.17 mg/kg for calcium, 0.17 to 0.30 ppm for phosphate, and 0.04 to 0.8 ppm for nitrite. The pH ranged from 5.14 to 6.52 and the temperature ranged from 25°C to 27.3°C. It was observed that the pH was generally acidic at all locations. Potassium dominated the exchangeable bases among the elements while phosphate and nitrite have the least occurrence. Conclusion: Although the presence of some minerals in higher amounts in the soil may lead to increase in bacterial load and help the organisms in degrading a wide variety of organic material which will eventually lead to high yield productivity of agricultural products from the wetland. These results provide the baseline data of Alimosho wetland soils for its management and sustainable agriculture

Key words: Wetland;Sustainable Agriculture;Microbiological;Physicochemical parameters



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