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Evaluation the Correlation Between Pathogenic Microorganisms on Cultured Clam Meretrix SP. and Disease Incidence
Nguyen Duc Minh,
Le Ngoc Hanh,
Nguyen Thuy Linh
Issue:
Volume 9, Issue 4, August 2020
Pages:
97-104
Received:
18 May 2020
Accepted:
11 June 2020
Published:
20 June 2020
Abstract: The study was carried out to determine the density of Vibrio sp. and Vibrio sp. in cultured clams and evaluate the correlation between pathogenic microorganisms and disease incidence of white clams (Meretrix Lyrata) in Mekong Delta from March to May 2019. Clam samples were collected in different four regions (Ben Tre, Tra Vinh, Bac Lieu, and Tien Giang provinces) and there was mass mortality of clam in Tra Vinh province in May. In this assay, determination of the Vibrio sp. density was performed using Vibrio sp. selective Thiosulfate Citrate Bile Salt agar plates. Also, the Vibrio sp. was cultured in Fluid thioglycollate medium to isolating the spore that effect to harmful for cultured clam. Then, T-test and one-way ANOVA analysis were used to access the impacts of those parameters on the clam health. Clams did not show specific clinical signs, and histological results showed minor injuries on their shells and gills. Correlation analysis revealed some biotic components related to clam health status; they were several Vibrio bacteria in clams were in the range of 0-2.23 x 105 (CFU/g). The presence of Vibrio sp. was detected in the clam tissue with a prevalence of 53% of the ratio of infection and the infection intensity of 4.08-57.43 (spores/g). However, the density of Vibrio sp. and the ratio of infection of Vibrio sp. on clam was no significant difference on outbreak disease and non-outbreak disease factor on clam samples (P>0.05) in the clam samples. Thus, dead clams can be caused by several other factors.
Abstract: The study was carried out to determine the density of Vibrio sp. and Vibrio sp. in cultured clams and evaluate the correlation between pathogenic microorganisms and disease incidence of white clams (Meretrix Lyrata) in Mekong Delta from March to May 2019. Clam samples were collected in different four regions (Ben Tre, Tra Vinh, Bac Lieu, and Tien G...
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The Empirical Research on Sustainable Development of the Industrial Undertaking Area in Yangtze River Economic Belt—Take Jinmen City of Hubei Province as an Example
Zhang Zhihui,
Jiang Zichun,
Huang Ping,
Liu Jian,
Wang Xiaoyan
Issue:
Volume 9, Issue 4, August 2020
Pages:
105-112
Received:
8 June 2020
Accepted:
23 June 2020
Published:
4 July 2020
Abstract: [Objective] It has been included into national strategy that we are going to exploit the Yangtze river basin, promote the industrial gradient transfer, and realize sustainable development, to form the new economic supporting belt of China. Industrial undertaking zone is the key area to the sustainable development of the Yangtze River economic belt. Studying quantitatively the regional ecological environment pressure, calculating the threshold value of sustainable development can provide decision-making reference for transforming the development mode of the Yangtze River economic belt and realizing sustainable development. [Method] Dynamically analyze the sustainable development situation from 2006 to 2014 in the demonstration undertaking area of Jing-men city using the ecological footprint model, And comparatively study the current development situation of industrial undertaking areas under provincial scale. [Result] During the sample period, the ecological deficit and ecological pressure in demonstration area continue increasing at first, and the coordination becomes gradually poor, the peak appears in 2012, then the pressure release, coordination begins to recover gradually, resource utilization is becoming efficient. The relation of GDP and ecological footprint fits for typical Kuznets inverted U curve. Undertaking area and demonstration area both highlight the characteristics of “high pressure, low coordination, low development level”. [Conclusion] Put forward the suggestions of carrying out the main function area planning, improving the ecology efficiency of industry and resource allocation efficiency, etc. to cross the inflection point of Kuznets inverted U curve with a lower ecological footprint level, and realize sustainable development.
Abstract: [Objective] It has been included into national strategy that we are going to exploit the Yangtze river basin, promote the industrial gradient transfer, and realize sustainable development, to form the new economic supporting belt of China. Industrial undertaking zone is the key area to the sustainable development of the Yangtze River economic belt....
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Effects of Fertilization and Harvesting Age on Yield and Quality of Desho (Pennisetum pedicellatum) Grass Under Irrigation, in Dehana District, Wag Hemra Zone, Ethiopia
Awoke Kefyalew,
Berhanu Alemu,
Alemu Tsegaye
Issue:
Volume 9, Issue 4, August 2020
Pages:
113-121
Received:
5 June 2020
Accepted:
19 June 2020
Published:
28 July 2020
Abstract: The experiment was conducted to evaluating the effects of fertilizer and harvesting age on agronomic performance, chemical composition and economic feasibility of Desho (Pennisetum Pedicellatum) grass under irrigation, in Ethiopia. A factorial arrangement with four fertilizer types (control, urea, compost and urea + compost), and three harvesting ages (90, 120 and 150) with three replications were used. Data on morphological characteristics of the grass were recorded. Based on the data collected, harvesting age was significantly affected the agronomic parameters of the grass. Plant height (PH), number of tillers per plant (NTPP), number of leaves per plant (NLPP), number of leaves per tiller (NLPT), dry matter yield (DMY), leaf length (LL) and leaf area (LA) were increased with increasing harvesting age, while leaf to stem ratio (LSR) showed a decreasing trend. NDF, ADF and ADL content were also increased with increasing age, while ash declined with age. Fertilizer was also significantly affected the agronomic parameter of Desho grass. A mixture of 50 kg urea (U)/ha and 6,000 kg compost/ha was provided the highest NTPP, NLPP, NLPT, and DMY, while NF (control) was the lowest in all parameters. Highest NDF, ADF, ADL and ash content were recorded at the control group. In general, using a mixture of 50 kg urea (U)/ha and 6,000 kg compost/ha fertilizer is the most important for long-term Desho grass production which provides a high benefit-cost ratio. Further research is needed in different organic and inorganic fertilizer combinations.
Abstract: The experiment was conducted to evaluating the effects of fertilizer and harvesting age on agronomic performance, chemical composition and economic feasibility of Desho (Pennisetum Pedicellatum) grass under irrigation, in Ethiopia. A factorial arrangement with four fertilizer types (control, urea, compost and urea + compost), and three harvesting a...
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Land Suitability Evaluation for the Growth of Chamaecyparis obtusa Forest in Gyeongnam Province, South Korea
Moon Hyun Shik,
Tamirat Solomon
Issue:
Volume 9, Issue 4, August 2020
Pages:
122-127
Received:
16 July 2020
Accepted:
30 July 2020
Published:
17 August 2020
Abstract: This study was conducted at eight different cities and counties of Gyeongnam province with the objective of evaluating the suitability of lands for the growth of Chamaecyparis obtusa (C. obtusa) species. From each city and county seven to ten sites were systematically selected for the study based on the regional representation of the sample sites by considering south, east, west and north regions of the province. From the selected sites soil data was collected by removing the top fertile soil in order to avoid the influence of decomposed top organic materials on the top soil. Soil samples from each site were air dried and the necessary laboratory processes undertaken. Evaluation of physiochemical characteristics was conducted by analyzing the properties of soil with growth requirement of the species. Storie parametric and FAO land evaluation methods were adopted to evaluate the parameters which were identified as important for the growth of the species. Based on the total index resulted from the parametric evaluation, suitability class was defined by assigning classes of highly suitable, (S1), moderately suitable (S2), marginally suitable (S3) and non-suitable (S4). The results of the study revealed that two study city/county were moderately suitable and the rest were categorized under marginally suitable for the growth and productivity of the species but there was no site which was categorized as highly suitable and non-suitable. It was recommended to use more silvicultural management for the areas categorized under marginally suitable in order to enhance the productivity.
Abstract: This study was conducted at eight different cities and counties of Gyeongnam province with the objective of evaluating the suitability of lands for the growth of Chamaecyparis obtusa (C. obtusa) species. From each city and county seven to ten sites were systematically selected for the study based on the regional representation of the sample sites b...
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Genetic Variability, Heritability and Genetic Advance Among Bread Wheat Genotypes at Southeastern Ethiopia
Tilahun Bayisa,
Habtamu Tefera,
Tesfaye Letta
Issue:
Volume 9, Issue 4, August 2020
Pages:
128-134
Received:
27 February 2020
Accepted:
12 June 2020
Published:
19 August 2020
Abstract: The knowledge of nature and magnitude of variation existing in available breeding materials is great importance for successful selection of varieties. This study was conducted to generate information on the extent of genetic variability in advanced bread wheat lines. Thirty bread wheat genotypes were tested at Sinana and Agarfa, Southeastern Ethiopia, in alpha lattice design with three replications. Combined over locations ANOVA was carried out for yield and yield related traits. There were highly significant differences among genotypes for all traits. Highly significant location effects at P < 0.01 were observed for yield and yield related except for harvest index which showed significant effect at P < 0.05 and grain yield non-significant location effect. This indicates the presence of variability for these characters among the tested genotypes. In combined analysis, grain yield had high PCV (27.1%) and moderate GCV was observed for biomass weight, grain yield and harvest index. Phenotypic coefficient of variance (PCV) moderate for biomass weight and harvest index. Heritability estimates in broad sense (H2) was very high for most of the characters except for grain yield (52.3%) and number of kernel per spike (73.2%). However, low GAM was observed for most of the characters except moderate GAM was observed for harvest index (15.9%). Finally, the presence of variability among the genotypes, performance of heritability and GAM in the tested traits of the genotypes confirmed possibility to increase wheat productivity. Hence, selection and hybridization on those genotypes can be recommended for farther yield improvement of bread wheat.
Abstract: The knowledge of nature and magnitude of variation existing in available breeding materials is great importance for successful selection of varieties. This study was conducted to generate information on the extent of genetic variability in advanced bread wheat lines. Thirty bread wheat genotypes were tested at Sinana and Agarfa, Southeastern Ethiop...
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