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Factors Affecting Farmers’ Adoption of Sustainable Land Management Practices in Vietnam

Nguyen Mau Dung

Received: Mar 30, 2022 / Published: Sep 30, 2022
This study aimed to identify the factors affecting farmers’ adoption of sustainable land management (SLM) practices to combat land degradation in Vietnam. Based on the survey data from 826 farmers in three representative regions, the study showed that the SLM model and SLM adoption rate were quite varied due to differences of natural and socio-economic conditions. The results of logistic regression showed that household income and access to loans had positive impacts on SLM adoption with statistical significance in all the regions surveyed. More extension visits in the upland and coastal regions, and more agricultural laborers in farm households in the coastal and Mekong delta regions were found to increase the probability of SLM adoption. Meanwhile, the number of plots and number of members in households were found to have negative impacts on adoption. Providing training courses for farmers, building SLM demonstrations, and providing financial support for farmers through credit programs should be enhanced for better SLM adoption in farm households.
The Importance of Socio-economic Development to Sustainable Natural Resources Management in Rural Areas: A Case Study of Sustainable Livelihoods and Forest Management in Xuan Nha Nature Reserve in Northwestern Vietnam

Nguyen Thi Luyen, Ngo Thanh Son

Received: Aug 23, 2021 / Published: Mar 30, 2022
Sustainable forest management is facing threats such as deforestation, forest degradation, and biodiversity loss due to socio-economic conditions, a weak governance capacity, and lack of public participation. In Xuan Nha Nature Reserve, about 50% of the total population are living below the poverty level and their livelihoods are depending on forest. The community’s activities have been creating pressures on the forest by reducing the forest area, increasing forest land degradation, and through illegal logging. The objectives of the study were to (i) identify sustainable livelihood options; (ii) the most suitable livelihood practices with the purpose of reducing poverty for local communities and their dependency on forest resources; and (iii) recommend suitable policies to reduce the conflict between socio-economic development and forest management. In order to achieve these objectives, we used the LIFE (livelihood, income, forest condition, and equity); the Sustainable Livelihood Framework; and the Advocacy Coalition Framework. The results showed that fruit orchards and beekeeping were two suitable livelihood options for the buffer areas since there were more convenient assets such as roads, markets, and human knowledge, while fruit orchards and local pig farming were suggested for the ERA (ecological restoration area) and SPA (strictly protected area) to solve the problem of land degradation and maintain the traditional habits of the local community. Regarding policy changes, support for livelihood practices and improvement of the community’s and authorities’ awareness on forest protection was necessary for all the sub-areas for reducing poverty and the pressures on forest resources of the community.
Establishment of Reciprocal Micrografting of Tomato (Solanum lycopersicum L.) and Eggplant (Solanum melongena L.)

Son Truong Dinh, Tham Thi Tran

Received: Oct 19, 2018 / Accepted: Oct 22, 2018 / Published: Oct 22, 2018
Micrografting can be used as a key tool to investigate gene-function, long-distance signal transduction, or metabolite movement in different developmental and physiological stages. In plant production, plant grafting can be applied to improve productivity and/or increase the tolerance of plants to stresses. Here, we describe a simple and high efficiency protocol for reciprocal micrografting of tomato (Solanum lycopersicum L.) and eggplant (Solanum melongena L.). Tomato and eggplant seeds can be disinfected with 0.5% Presept for 20 min before germinating on MS media. Seedlings of 5-day-old tomatoes and 15-day-old eggplants were suitable for preparation of scions and rootstocks. Scions were cut into 0.5-1 cm lengths for micrografting. Sucrose levels greatly influenced the graft success rate of all graft combinations including of self- and reciprocal micrografting between tomato and eggplant. While self-grafted tomatoes or eggplants required 20 g L-1 sucrose to get the highest grafting success rate (72% for tomato and 100% for eggplant), reciprocal micrografting of tomato/eggplant and eggplant/tomato reached the highest success rate (83%) on MS medium supplemented with 30 g L-1 sucrose. Grafted plants should be cultured under the illumination conditions of a 16 h light/8 h dark cycle for optimal growth and quality.
An Overview of Drug Effects on Bone Healing on Animal Research Models

Nguyen Hoai Nam, Kampa Naruepon

Received: May 19, 2019 / Published: Jun 18, 2021
Bone fracture is a common health problem in humans and animals, and the healing of the bone fracture is a complicated process. Several drugs may be used concurrently with the treatment of fractures, but they may interfere with the healing process of the bone. The present research reviewed previously published studies with the objective to enhance the understandings of the effects of different drugs on bone healing. There is clear evidence that antibiotics, corticosteroids, non-steroidal inflammatory drugs, and chemotherapeutic drugs all affect bone healing. By contrast, the effect of anticoagulants on bone healing is controversial, so more research is needed to determine its efficacy. In addition, there is no direct evidence to approve the effect of anesthetics on bone healing, so this is another area in need of further research.
Effects of Frozen Storage on the Physical Properties and Sensory Acceptability of Goat’s Milk Yoghurt

Nguyen Duc Doan, Vicky Ann Solah

Received: Feb 14, 2019 / Published: Jun 05, 2020
The effects of frozen storage of goat’s milk on the physicochemical, physical properties, and sensory attributes of goat’s milk yoghurts were evaluated. Four yoghurts were made from goat’s milk stored at 4℃ overnight, and at -6, -20, or -35℃ for 1 month. Goat’s milk yoghurts were stored at 6℃ for 21 days. Protein and lipid contents in all the yoghurts were insignificantly different, however, the total solids content, including the added sugar in the yoghurts made from frozen goat’s milk, significantly increased in comparison with that in the yoghurt made from chilling goat’s milk. The water holding capacity (WHC) and viscosity for all the yoghurts at any period of cold storage were statistically different. No significant differences in pH or titratable acidity for all the yoghurts were observed after 1 day of cold storage; however, these physicochemical properties for the yoghurts after 7 days of storage were significantly different. All the yoghurts after 21 days of storage received similar scores for appearance and texture, but significantly different scores for color, odor, flavor, and overall acceptability.
Development of a Key Performance Indicators System in Urban Planning by Utilizing the Logic Model

Quyen Thi Lan Phuong, Matsushima Kakuya

Received: Aug 20, 2018 / Accepted: Aug 20, 2018 / Published: Aug 20, 2018
This study proposes the methodology and process to develop a Key Performance Indicators (KPIs) system in urban planning by utilizing the logic model. Firstly, the study introduces the role of KPIs in urban planning for measuring the performance of the whole planning process, and the logic model as a powerful tool for selecting KPIs, as well as the ability to apply it in urban planning issues. Secondly, methodologies are given, including: building a KPIs system from the logic model’s components, data collection for KPIs, and data analysis. Thirdly, the case of the Hanoi master plan is presented, to investigate how the logic model works for KPIs development. The process of the logic model application includes: identification of planning policies; zoning Hanoi for the simulation of the policies’ effects; utilizing the logic model for selecting KPIs; analysis of logical linkage between the logic model’s components; and Hanoi urban data availability for KPIs.
Effects of Nitrogen Forms on Root System Development, Physiological Traits, and Dry Matter Production of Rice

Thiem Thi Tran, Yamauchi Akira

Received: Aug 20, 2018 / Accepted: Aug 20, 2018 / Published: Aug 20, 2018
The objectives of this study were to evaluate the effects of nitrogen forms on root system development (expressed as total root length, nodal root number, nodal root length, and lateral root length), water use, photosynthetic rate, and dry matter production under water deficit (WD) at 20% w/w and continuously waterlogged (CWL) conditions. Rice plants cv. Nipponbare were grown in plastic pots in a vinyl house. Six N forms were applied at the same rate of 360 mg N per pot, and were prepared as follows: N-NH4+ alone (A); N-NH4+ with nitrification inhibitor (A+DCD); N-NO3- alone (N); N-NO3- with nitrification inhibitor (N+DCD); combined N-NH4+ and N-NO3- (AN); and combined N-NH4+ and N-NO3- with nitrification inhibitor (AN+DCD). The nitrification inhibitor, dicyandiamide (DCD) (C2H4N4), was applied at the rate of 100 mg pot-1. The results of the experiment showed that under both WD and CWL conditions, significant increases were seen in the root system development as expressed through total root length, nodal root number, nodal root length, and lateral root length in the N-NO3- treatments with and without DCD compared to the application of N-NH4+ treatments with and without DCD. This led to an increase in water use, and eventually a significant increase in dry matter production. Similarly, the A treatments with and without DCD also significantly increased root system development as compared with the AN and AN+DCD treatments. Furthermore, under both CWL and WD conditions, the positive and notably significant correlations between the total root length and water use, as well as between the total root length and shoot dry weight, were found only in the A and A+DCD treatments. These results indicate that rice prefers sole ammonium over the mixed ammonium-nitrate treatment, and sole nitrate applications under both WD and CWL conditions.
The Impacts of Social and Economic Determinants on Poverty: An Empirical Study on Southeast Asia

Nguyen Anh Tru

Received: Sep 02, 2021 / Accepted: Jun 27, 2022 / Published: Jun 27, 2022
The article attempted to examine the influences of social and economic determinants on poverty in seven Southeast Asian countries, namely Lao PDR, Malaysia, Myanmar, the Philippines, Thailand, Timor-Leste, and Vietnam, between 1996 and 2013 using a panel dataset. It was empirically found that the average GDP per capita and Gini index contributed to poverty reduction in Southeast Asian countries. The results also addressed that the population and poverty gap had positive impacts on the rate of the poverty headcount in the region. Policies were recommended to accelerate economic growth, reduce poverty, and achieve sustainable development in Southeast Asia. First, economic growth should be fostered since it assists in reducing poverty in Southeast Asian countries. Second, although the growth of population provides the labor forces to the economy, population growth in Southeast Asia should be carefully controlled since it increases poverty in the region. Third, an increase in the number of rich inhabitants in the society should be encouraged because it can mitigate poverty in the region. Finally, policies in redistributing income as well as in narrowing down income inequality in each society should be considered by the governments because these contribute to poverty reduction in the region.
Effects of Cover Methods and Nitrogen Levels on the Growth and Yield of Tomato

Nguyen Thi Loan, Tran Thi My Can

Received: Nov 17, 2020 / Published: Aug 10, 2021
To study the effects of cover methods and nitrogen (N) levels on the growth and yield components of tomato Cv. Pear F1, field experiments with a 4x3 factorial design were conducted in the 2019 spring and winter seasons using a randomized complete block design with three replications. The cover methods included four treatments: bare soil (BS), black plastic mulch (BPM), transparent polypropylene row cover (RC), and a combination of BPM and RC (BPMRC) with the RC removed approximately 30 days after transplanting. Nitrogen (N) was applied at three levels (150, 180, and 210 kg N ha-1). Using BPM and RC generally led to an increased air temperature, air humidity, soil moisture, and soil temperature compared to the BS treatment. Higher N rates (180 and 210 kg N ha-1) did not result in different tomato fruit sizes and fruit weights but positively increased fruit yield and quality (Brix values and fruit dry weight) as compared to the 150 kg N ha-1 addition. The cover methods positively affected the yield components and fruit yield of tomato as well as the fruit characteristics compared to the BS treatment. Using cover materials (BPM and RC) combined with a higher N application significantly increased the yield attributes and fruit yield. The highest fruit yield was achieved under the mulching treatment by black plastic (BPM treatment) combined with a 210 kg N ha-1 application, resulting in 50.90 tons ha-1 in the spring and 58.27 tons ha-1 in the winter.
Effects of Organic Fertilizer and HB101 Plant Vitalizer on the Growth and Yield of Rice (Oryza sativa L.)

Nguyen Thi Loan, Nguyen Ngoc Hung

Received: Jun 14, 2019 / Published: Aug 30, 2019
To study the effects of organic fertilizer and HB101 organic plant vitalizer on the growth and yield components of the BH9 rice variety, a field experiment with 4 x 3 factorial design was conducted at Hong Thai commune, Kien Xuong district, Thai Binh province in 2017 summer season using a randomized complete block design with 3 replications. Organic fertilizer derived from chicken manure and peat was applied at 3 levels (0 ton ha-1, 4 tons ha-1, and 6 tons ha-1) while the HB101 plant vitalizer was sprayed in 4 levels (0%, 0.015%, 0.025%, and 0.035%; the amount of water to dilute HB101 was 1000 litre ha-1). The application of the organic fertilizer alone and the combination of organic fertilizer and HB101 positively increased the total tiller number, effective tiller number, leaf area index (LAI), SPAD value, dry matter accumulation, yield components, and grain yield of rice. There were also differences in the SPAD values (at flowering stage), dry matter weight (at active tillering stage), and 1000 grain weight under the influence of the HB101 solution. The combination of 6 tons ha-1 organic fertilizer and HB101 significantly increased the grain yield as compared to the other treatments, and the highest grain yield (3.03 tons ha-1) was obtained when organic fertilizer (6 tons ha-1) was applied in combination with HB101 plant vitalizer (0.025%).
Effects of Heat Treatment Process on Mechanical Properties of Medium Carbon Steel

Pham Thi Hang

Received: Oct 27, 2020 / Published: Dec 31, 2021
In order to select an appropriate heat treatment process for an industrial application of S45C medium carbon steel, it is necessary to investigate the influence of technological parameters during the heat treatment process such as heating temperature, holding time and cooling medium on the microstructure and mechanical properties. In this study, the experiments were conducted in various heating temperatures, holding times and cooling mediums for specimens made of S45C steel. Then, the relationship between the microstructure and the hardness of the steel was examined. The obtained results show that the heating temperature and cooling medium strongly affect the microstructure of this steel, leading to considerable changes in the hardness. The hardness of S45C steel was markedly improved when heated above 800oC and cooled in water. Moreover, the holding time needs to be carefully calculated to obtain finer grain structure to prevent an increase in the brittleness.
The Impacts of Financial Development, Trade Openness, Natural Resources Rent, and Government Expenditure on Economic Growth: Evidence in Northeast Asia

Nguyen Anh Tru

Received: May 02, 2023 / Published: Dec 30, 2023
The association among financial development, trade openness, natural resources rent, government expenditure, and economic growth has been investigated by scholars, but the results have been controversial. This study attempts to examine the relationship among financial development, trade openness, natural resources rent, government expenditure, and economic growth in three Northeast Asian countries, namely China, Japan, and the Republic of Korea, between 1981 and 2020 using the fixed effect and random effect models. The results of the feasible generalized least squares model stated that economic growth of these countries can be fostered by financial development and trade openness. However, surprisingly, natural resources rent had a negative effect on the economic growth of the three countries in the region, while the relationship between government expenditure and economic growth was not statistically significant. Finally, policies are recommended to accelerate economic growth and achieve sustainable development for the region. First, financial development should be encouraged by improving domestic credit to the private sector. Second, trade openness should be facilitated to exploit competitive advantages in export-led growth, and science and technology. Finally, the countries should implement sustainable growth models to their reduce dependence on natural resources and achieve sustainable development for the region.
Coping Strategies of Households in Lao Cai Province in Dealing with Risks in Tea Cultivation

Nguyen Thi Thu Quynh

Received: Nov 07, 2022 / Published: Sep 29, 2023
Tea farming households in Lung Vai commune, Muong Khuong district have been facing different types of risks. This study aimed to analyze their current risk-coping strategies, then to propose some solutions for the future. A total of 90 farmers in 3 villages with different production scales had been interviewed using semi-constructed questionare of how they identified and measured risks based on their observations and experience. The statistical descriptions and comparisons results pointed out that most of them were very proactive and flexibly applied different strategies and measures to prevent and minimize losses. However, the differences in the strategies chosen and the level of application among the households depended largely on the household’s resource capacity as well as the awareness of the household head. To promote the sustainable development of tea production in this area, the government and relevant actors in the local tea value chain should work together in order to develop solutions to intervene and support households to improve their capacity to apply risk-coping strategies more effectively in the future.
Effects of Nitrogen Applications on Transpiration, Physiological, and Growth Characteristics of Sugarcane (Saccharum spp.)

Dinh Thai Hoang

Received: May 21, 2023 / Published: Jun 30, 2023
Improving fertilizer and water use efficiencies is an important strategy in agricultural production. This study aimed to evaluate the effect of nitrogen fertilization on the daily whole-plant transpiration, growth, and physiological activities of sugarcane. The pot experiment was conducted under glass-house conditions. Five treatments of various nitrogen application rates (0, 4, 8, 12, and 16mM) were assigned in a randomized complete block design with three replications. The result showed that higher nitrogen applications led to higher growth, physiological, and biomass parameters. Nevertheless, biomass nitrogen use efficiency and photosynthetic water use efficiency declined because of applying nitrogen at higher rates. During the first weeks of plant growth, no significant differences in plant height, leaf number, SPAD, and whole-plant transpiration among nitrogen treatments indicated that higher nitrogen added was not necessary during this time. Nitrogen and water use efficiencies could be improved if the remaining soil nitrogen and crop growth stage nitrogen requirements are estimated in cultivation practice.
Characterization of Variovorax Strain C6d Isolated from the Algae-bacteria Consortia

Vu Thi Hoan

Received: Sep 24, 2020 / Published: Oct 29, 2021
The rhizosphere microorganisms can form beneficial, pathogenic, or neutral relationships. These relationships can promote plant growth and productivity. Among them, a number of Variovorax isolates from the rhizosphere were isolated. Bacteria Variovorax strain C6d (AB552893) was isolated from the non axenic culture of Chlorella spp., C6. The cell was Gram-negative, motile, non-spore-forming, short and rod-shaped (0.5-1.0x1.5-2.0µm). Colonies were in white colour after 7 days on 10-fold diluted Nutrient Broth. The strain was able to tolerate NaCL to 1.0% but not to 4.0% of NaCl. It grew quite well at temperatures ranging from 10°C to 37°C, yet did not show any growth at 4°C and 42°C. The dominant isoprenoid quinone was ubiquinone 8 (Q8). The major fatty acid composition of this strain was summed feature 3, 16:0 and 18:1:w7. The DNA G+C content of strain C6d was 70.4 mol%.
Evaluation of the Physicochemical Properties and Sensory Attributes of Yoghurt Made from Mixtures of Goat’s and Cow’s Milks

Nguyen Duc Doan

Received: Mar 06, 2019 / Published: Dec 24, 2019
The objective of the study was to evaluate the effect of cow’s milk added to goat’s milk on physicochemical properties and sensory attributes of yoghurt. Yoghurts prepared from five different proportions of cow’s milk and goat’s milk were stored at 4-6ºC for 1, 7, and 14 days and then evaluated for their physicochemical (total solids, protein, pH, and acidity) and physical properties (viscosity and water holding capacity), and sensory characteristics (acceptability). The total solids of the evaluated yoghurts significantly increased, but the protein content decreased when the amount of cow’s milk increased in the mixtures of milk. The results showed that the pH value of the yoghurt made from only goat’s milk was higher, while the titratable acidity was lower than those of the yoghurts made from the mixtures of goat’s and cow’s milks. The yoghurt obtained from the mixture of milks containing 80% goat’s milk and 20% cow’s milk exhibited the highest viscosity and water holding capacity among the evaluated yoghurts. All the yoghurts received similar scores for color, odor, and texture after all periods of storage, while the highest score in terms of flavor was received for the yoghurt made from the mixture of milks containing 60% goat’s milk and 40% cow’s milk. Addition of cow’s milk to goat’s milk was shown to significantly contribute to the viscosity, water holding capacity, and flavor of the resulting yoghurts.
The Framework of Ecosystem Services for Economic Valuation Purposes: A Review

Nguyen Minh Duc

Received: Dec 25, 2018 / Published: Dec 24, 2019
Although humans need ecosystems and ecosystem services for their survival and well-being, most of the global ecosystems and the services that they provide have declined and/or degraded rapidly over the past few decades. In order to find the ways to sustainably use natural resources, substantial efforts have been made to measure and value the ecosystem services. The term ‘ecosystem service’ was interpreted in different ways in the literature. For making correct decisions in natural resource management, a consistent way of defining and classifying ecosystem services is needed for valuation purposes. This paper argued for the need to divide ecosystem services into intermediate and final services.

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