Research Article
Evaluation of Nitrogen-fixing Inoculants for Enhanced Production of Groundnut (Arachis hypogea L.) in Pawe District, North Western Ethiopia
Asresach Addisu*
,
Mesfin Kuma,
Wubayehu Kidanemariam,
Misganew Andualem,
Seble Getaneh
Issue:
Volume 10, Issue 1, June 2025
Pages:
1-8
Received:
12 March 2025
Accepted:
31 March 2025
Published:
29 April 2025
Abstract: Groundnut (Arachis hypogea L.) cultivation in Ethiopia is dominated by smallholder farmers who use little or no inputs, often resulting in low yields. The use of effective rhizobia isolates was considered an ecologically and environmentally sound approach for groundnut production. A field experiment was conducted in the Pawe district in Metekel zone, Benishangul Gumuz National Regional State (BGNRS) during the 2022 cropping season on five farmers’ field to evaluate the effectiveness of nitrogen-fixing inoculants of groundnut, namely, Dibate-modermo. The experiment consisted of four treatments; T1=negative control (without chemical fertilizer and inoculant), T2= NPS fertilizer at a rate of 100kg ha-1, T3=NEM isolate, and T4=Dibate-modermo isolate. It was laid out in a randomized complete block design with five replications. Five composite soil samples were collected from 0-20 cm depth before planting and analyzed for selected soil properties. The treatments were not replicated per farm; instead, farmers were used as a replicates. Results of the analysis of variance (ANOVA) indicated that plant height, number of nodules, branches, seeds, and pods per plant, haulm yield, and grain yield were significantly affected by the application of treatments. The highest grain yield was obtained with inoculation of Dibate-modermo isolate, which increased grain yield by 49.9% as compared to the untreated plots. Similarly, this isolate resulted in the highest net benefit (75,460.8ETB ha-1) with acceptable MRR (2667.7%). Hence, mass production and utilization of Dibate-modermo isolate is recommended for enhanced production and improved productivity of groundnut in the area.
Abstract: Groundnut (Arachis hypogea L.) cultivation in Ethiopia is dominated by smallholder farmers who use little or no inputs, often resulting in low yields. The use of effective rhizobia isolates was considered an ecologically and environmentally sound approach for groundnut production. A field experiment was conducted in the Pawe district in Metekel zon...
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Research Article
Optimization of Ammonia Removal in the Initial Phase of Biofloc System by RSM and Application of Maize Hydrolysate in BFT Based Culture of Clarias gariepinus
Chang Guk Kim,
Song Nam Go,
Byol Ung Jon,
Song Nam U,
Kwang Il To*
Issue:
Volume 10, Issue 1, March 2025
Pages:
9-19
Received:
12 March 2025
Accepted:
18 April 2025
Published:
24 May 2025
DOI:
10.11648/j.bmb.20251001.12
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Abstract: In this study, the initial phase of biofloc system was investigated and the main controllable factors were optimized by RSM. Maize hydrolysate was used as carbon source for the first time and Bacillus subtilis was added to a biofloc system as inoculum. Optimal condition was set at 17 of C/N ratio, 13mg/L of nitrogen concentration and 60 L/min•m3 of aeration in practice. After scaling the optimal condition up to circular tank with volume of 30 m3, the biofloc system was successfully matured in five days. Three groups, namely two BFT groups and one control group (traditional culture) were created. In BFT groups, starch and maize hydrolysate was used as carbon source, respectively. African catfish with initial weight of 0.667±0.03g were stocked in each group and reared for 60 days. Water quality parameters including ammonia, nitrite and BFV were improved in biofloc groups, and ammonia in maize hydrolysate group were significantly lower than starch group. Moreover, remarkable differences (p<0.05) were observed in performance parameters including survival rate, weight gain, feed efficiency and specific growth rate between control, starch and maize hydrolysate groups. This result indicated that maize hydrolysate was more effective carbon source than starch in biofloc system rearing catfish fingerling.
Abstract: In this study, the initial phase of biofloc system was investigated and the main controllable factors were optimized by RSM. Maize hydrolysate was used as carbon source for the first time and Bacillus subtilis was added to a biofloc system as inoculum. Optimal condition was set at 17 of C/N ratio, 13mg/L of nitrogen concentration and 60 L/min•m3 of...
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