Starting in 2018, VJAS is set to launch a full English version of VJAS and publish quarterly both online and in print with the ISSN 2588 – 1299. Each issue will contain 8-10 articles, with each article being approximately 5000-8000 words. All submissions will be independently refereed by editorial board members and will undergo rigorous peer-review following international standards from at least two assigned peer reviewers (including one Vietnamese reviewer and one foreign reviewer) who come from universities, institutes, and relevant administrative agencies in Vietnam and from other countries around the world. The aim of VJAS is to be indexed in ISI/Scopus lists within four to six years from its first published issue (August 2018).

Vol 2 No 4 (2019): Vietnam Journal of Agricultural Sciences

Issue Information:

Starting in 2018, VJAS is set to launch a full English version of VJAS and publish quarterly both online and in print with the ISSN 2588-1299. Each issue will contain 5-10 articles, with each article being approximately 5000-8000 words. All submissions will be independently refereed by editorial board members and will undergo rigorous peer-review following international standards from at least two assigned peer reviewers (including one Vietnamese reviewer and one foreign reviewer) who come from universities and research institutes in Vietnam and other countries around the world. The aim of VJAS is to be indexed in ISI/Scopus lists within four to six years from its first published issue (September 2018).

The English version of VJAS is devoted to publishing papers, both scientific articles and reviews or mini-reviews, from all areas related to agriculture disciplines, especially those focusing on crop science, plant protection, animal science, veterinary medicine, aquaculture, agricultural mechanical and electrical engineering, soil science and plant nutrition, ecology and environment, biotechnology, food technology, economics and rural development, and information technology in agriculture, etc.

Published: 2020-05-15

Growth and Physiological Responses of Sugarcane to Drought Stress at an Early Growth Stage

Growth and Physiological Responses of Sugarcane to Drought Stress at an Early Growth Stage

by Bui The Khuynh, Vu Ngoc Thang, Vu Dinh Chinh, Pham Thi Thom
Received: May 14, 2020 / Published: May 15, 2020
Abstract: A pot experiment was conducted in a net house to evaluate the effects of drought stress (a 20-day water withholding treatment from 100-120 days after planting) on the growth and physiology of five sugarcane cultivars. The results showed that water stress at an early stage significantly affected sugarcane growth and physiology. Water stress resulted in reductions in plant height, stalk diameter, and leaf number of sugarcane, in addition to reductions in the photosynthetic pigment content, Fv/Fm,
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and SPAD (Soil Plant Analysis Development) readings after the 20-day withholding water period (120 DAP), and in stem, root, and leaf fresh weights, and leaf area at 150 DAP. Besides, drought stress led to increases in stomata density and decreases in stomata length. Variation was also found among the cultivars in response to water stress. Significant genotypic differences in stem fresh weight and leaf area under water stress among the cultivars were observed. The highest value of stem fresh weight under stressed conditions was recorded in ROC22 (50.6 g), followed by QĐ159 (46.5g), ROC16 (46.2g), ROC10 (46.1g), and VL06 (44.4g). However, the highest DTI was recorded in ROC16, followed by VL06, ROC10, QĐ93-159, and ROC22, respectively.

Green Solvent Extraction and Quality Characteristics of Passion Fruit Seed Oil (Passiflora edulis Sims var. edulis)

Green Solvent Extraction and Quality Characteristics of Passion Fruit Seed Oil

by Nguyen Thi Thu Nga, Nguyen Xuan Bac, Lai Thi Ngoc Ha
Received: May 14, 2020 / Published: May 15, 2020
Abstract: The extraction of oil from passion fruit seeds with acetone, ethanol, ethyl acetate, isopropanol, and hexane was studied. The effects of the variables, namely type of solvent, material to solvent ratio, temperature, and extraction time, were investigated. The highest extraction yield was 78.52%, which was obtained using ethyl acetate with a material to solvent ratio of 1/10 at room temperature (28oC) for 4h using a shaker. This yield was similar to that obtained when using hexane as
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a solvent. Our results indicate that ethyl acetate can replace the conventional hexane solvent in the extraction of oil from passion fruit seeds. The high content of polyunsaturated fatty acids in passion fruit seed oil suggests that this product has good potential for use in the human food, cosmetic, and pharmaceutical industries.

Influence of Mastitis and Repeat Breeding Incidence on Participation in the Animal Insurance Program for Dairy Farmers in Ba Vi, Hanoi, Vietnam

Influence of Mastitis and Repeat Breeding Incidence on Participation in the Animal Insurance Program

by Kentaro Koide, Ryo Murata, Au Xuan Khoa, Nguyen Khanh Ly, Phan Thi Tam, Vu Thi Thu Tra, Duong Van Nhiem, Satoko Kubota, Hiroichi Kono, Kohei Makita
Received: Jun 15, 2019 / Published: May 15, 2020
Abstract: The livestock insurance program for dairy farmers in Vietnam targeting various acute diseases began in 2011 as a pilot project; however, due to vaccination campaigns, outbreaks of such diseases are rare. The objective of this study was to investigate the effects of mastitis and reproductive failure-which chronically affect the farming economy-on the decision to participate in the insurance program. A survey involving a questionnaire and milk sampling from apparently healthy animals was
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conducted on the 38 participating and 59 non-participating dairy farms in the livestock insurance program in Ba Vi, Hanoi, Vietnam, in August 2014. Microbiological tests were performed to detect sub-clinical mastitis, whereas the questionnaire was administered to collect information regarding farm management and the occurrence of clinical mastitis and reproductive failure over the previous three months. There were no significant differences in the proportion of farms having cows with clinical mastitis (insured: 8/38 farms, 21.1% vs. non-insured: 13/58 farms, NA = 1, 22.8%, p = 1) and repeat breeders (insured: 16/36 farms, NA = 2, 44.4% vs. non-insured: 20/57 farms, NA = 2, 35.1%, p = 0.49) over the previous three months. The proportion of farms having cows with sub-clinical mastitis at the time of the survey was also not significantly different between insured (5/38 farms, 13.2%) and non-insured (7/59 farms, 11.91%) farms (p = 1). Based on the obtained results, neither endemic disease nor farm management is respectably involved in the decision of farms to participate in the animal insurance program targeting acute animal infectious diseases.

Aquaculture Development and Nutrition Management of Large Yellow Croaker (Pseudosciaena crocea) in China: An Overview

Aquaculture Development and Nutrition Management of Large Yellow Croaker (Pseudosciaena crocea) in China

by Truonghuynh Thanhhoa, Guo Quanyou
Received: Aug 13, 2019 / Published: May 15, 2020
Abstract: Aquaculture production in China has made large contributions to the global total volume of fish for human consumption. The developed mariculture fish species large yellow croaker (Pseudosciaena crocea) is the highest economic marine fish of China. As a schooling fish, large yellow croaker (LYC) usually migrates from northeast China to the southeast seacoast to over-winter. Indeed, there are several culture systems that can be applied for large yellow croaker, which should simulate the natural
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habitat for this fish species. The nutrition management of LYC has attracted researchers to study their nutrient requirements, growth, and other physiological characteristics. Here, we review the general biology (geographic distribution and habitat), hatchery development, aquaculture systems, and nutrition management of LYC. The paper aims to underpin the most significant investigations and highlight the future prospects for the LYC aquaculture industry in China.
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