Research Article
Soil Enzyme Responses and Crop Productivity Indices Assessment in Agricultural Soil Impacted with Heavy Metals
Uchenna Fredrick Anikwe,
Godwin Ikechukwu Ameh,
Cyril Onyekachi Edeoga,
Emeka Henry Oparaji*
Issue:
Volume 8, Issue 2, December 2024
Pages:
34-44
Received:
29 March 2024
Accepted:
20 May 2024
Published:
29 September 2024
DOI:
10.11648/j.ajcbe.20240802.11
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Abstract: The present study assessed the productivity of cultivated garden vegetable among other ecological assessments in soil samples impacted with heavy metals. Assay of soil enzyme responses showed the activity of: catalase, peroxidase, lipase and ureasewith corresponding OD reading of 0.750, 2.05, 0.22 and 1.704 respectively. There were noticeable increases in the activity of ureaseandperoxidasewhilecatalaseandlipaseactivitywererelativelylowinthesampledsoil. Out of the 321g of the vegetable seedstested for viability, 45% representing 144.45g was used for the planting and further experiment. After three days of cultivation, germination process was recorded faster in the T. oleifera potted ridge while Amaranthus and Solanum sp seed took 3-4 day for break full dormancy. Determination of total chlorophyll a and b in the selected vegetables showed a correlative increase in chlorophyll a and b in soils contaminated with Zn, Cu and Fe in all the cultivated vegetables: T. oleifera, Amaranthus and Solanum sp, respectively. There are significant increase in total cholorphyl a (0.9mg/g) and b (0.8mg/g) contents from the results when compared with the control experiment as other soil contaminated with heavy metals such as: Pb, and As repressed the selected vegetables cultivated in the soil samples. However total chlorophyll a was seems lightly higher than cholophyl b in all the selected vegetable cultivated in soil. Analysis on the impact of heavy metals on the shootlength of the cultivated vegetables analysed for thirty-one days showed regressive increase in the shootlength of the cultivated vegetables as the period of harvest increases from 0-31 when compared with the control experiment. However Cd and As had the most estimated impact on the vegetables in all the cultivated soils and its impact progresses as the period of harvest increases. Dry matter weight contents of the cultivated vegetables cultivated in the polluted soils were analysed; also the same index was assessed in the vegetables from the unpolluted soils. There was a significant increase in the dry matter contents of the cultivated vegetables in soil polluted with Cu, Fe and Zn respectively. However, dry matter contents were seen progressively low in vegetables cultivated in soils polluted with Cd, As and Pb. When compared with the control experiment. The results from the present study have shown the vulnerability of agricultural soil and cultivated vegetables to effluent from industrial bias sources used for irrigation and its impact on agricultural productivity.
Abstract: The present study assessed the productivity of cultivated garden vegetable among other ecological assessments in soil samples impacted with heavy metals. Assay of soil enzyme responses showed the activity of: catalase, peroxidase, lipase and ureasewith corresponding OD reading of 0.750, 2.05, 0.22 and 1.704 respectively. There were noticeable incre...
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Research Article
Production and Optimization of Bioethanol from Mixed Banana and Papaya Peels Using Saccharomyces Cerevisiae
Asab Alemneh Tadesse*,
Temesgen Atnafu Yemata
Issue:
Volume 8, Issue 2, December 2024
Pages:
45-57
Received:
30 August 2024
Accepted:
18 September 2024
Published:
29 September 2024
DOI:
10.11648/j.ajcbe.20240802.12
Downloads:
Views:
Abstract: Mixed fruit peels (Banana (BP) and Papaya (PP) bioethanol was produced using Saccharomyces cerevisiae. The proximate and compositional analysis of BP and PP was obtained about 6.67% moisture, 5.75% ash, 82.75% volatile matter, and 5% fixed carbon and 1.1gram, 38.1%, 15.7% and 45.1% extractives, hemicellulose, lignin, and cellulose respectively from BP and 8.165% moisture, 5.5% ash, 81.25% volatile matter and 6% fixed carbon 2.08 gram, 42%, 8.6% and 47.32% extractives, hemicellulose, lignin, and cellulose respectively from PP. After Pretreat with KOH (5% w/v) optimize hydrolysis process parameters based on central composite design (CCD) to maximize fermentable sugars. The optimized hydrolysis conditions were 50:50 w/v% mixing of BP and PP, 1.75% H2SO4, and pH 5. The reducing sugar content was measured by DNS and results 11.737g/ml from fifty (50) grams of BP and PP. The maximum yield of bioethanol was 22.5% recorded after 72 hours. Fourier Transform Infrared Spectroscopy (FTIR) peaks associated with O-H, C-O, and C-H stretching and vibrations confirmed the presence of bioethanol in the product. The result confirms that the combination of BP and PP boosts bioethanol productivity than single peels.
Abstract: Mixed fruit peels (Banana (BP) and Papaya (PP) bioethanol was produced using Saccharomyces cerevisiae. The proximate and compositional analysis of BP and PP was obtained about 6.67% moisture, 5.75% ash, 82.75% volatile matter, and 5% fixed carbon and 1.1gram, 38.1%, 15.7% and 45.1% extractives, hemicellulose, lignin, and cellulose respectively from...
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