Vol 6 No 2 (2023): 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. 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.

DOI: https://doi.org/10.31817/vjas.2023.6.2

Published: 2023-06-30

Effects of Land Preparation and Iron-coated Rice Seeds on Yield, Growth Parameters, and Soil Properties in the Mekong Delta, Vietnam

Effects of land preparation and iron-coated rice seeds on yield, growth parameters, and soil properties

by Tran Van Dung, Nguyen Van Qui, Tran Huynh Khanh, Do Ba Tan, Vu Van Long, Nguyen Canh Cong, Miyauchi Masaaki, Kazumichi Sashi
Received: Jul 18, 2022 / Published: Jun 30, 2023
Abstract: The objective of this study was to evaluate the effects of land preparation methods and iron-coated (Fe-coated) rice seeds on the growth, yield, and Fe uptake of rice in alluvial soils in the Mekong Delta region. The experiment was conducted in the 2020 summer-autumn cropping season under the triple rice cultivation system in Chau Thanh district, An Giang province. The field experiment was designed as a randomized complete block design (RCBD) with six treatments and four replications. The
treatments were: (T1) puddled + water seeding + Fe-coated seeds; (T2) non-puddled + dry seeding + Fe-coated seeds; (T3) zero-tillage + non-puddled + dry seeding + Fe-coated seeds; (T4) puddled + water seeding + sprouted + non-Fe-coated seeds; (T5) puddled + wet seeding + sprouted + non-Fe-coated seeds; and (T6) puddled + transplanting + sprouted + non-Fe-coated seeds. The results showed that changes in the land preparation, planting method, and Fe-coated seeds did not significantly affect the number of tillers, plant height, yield components, soil chemical properties, grain yield, or Fe uptake of the rice plants and grains. However, the T3 and T6 treatments tended to have higher grains yields (5.86-5.90 tons ha-1), and higher total Fe content in grains (93.0-94.3 mg kg-1) and rice plants (83.1-84.0 mg kg-1). The findings from this study confirmed that the new planting method using zero-tillage + non-puddled + dry seeding + Fe-coated seeds can maintain the germination rate, growth, and grain yield of rice.

Correlation among Quality Characteristics in Medium-Grain Rice

Correlation among quality characteristics in medium-grain rice

by Bui Phuoc Tam, Pham Thi Be Tu, Nguyen Thi Pha, Duong Tran Ti Ni, La Ngoc Tuong Vi, Nguyen Thai Duong
Received: Jan 5, 2023 / Published: Jun 30, 2023
Abstract: Rice (Oryza sativa L.) grain attributes, such as grain length and shape, milling quality, and physicochemical quality, are crucial for varietal development and subsequent farm adoption. Thus, it is crucial to comprehend the phenotypic range of these grain attributes and how they relate to one another. Therefore, this study analyzed the main grain quality traits in medium-grain rice, namely the amylose content (AC), gelatinization temperature (GT), gel consistency (GC), ratio of head rice (HR),
and percentage of chalkiness (PC). Correlations among the major quality characteristics were then calculated through Pearson correlation matrix analysis. The results showed that AC was highly connected with GC, and PC and HR (GC) showed a strong correlation. The correlation between GT and GC was average. The other quality traits did not correlate significantly. The phenotypes of the grain quality traits provide a basis for improving the quality of medium-grain rice populations.

Effects of Nitrogen Applications on Transpiration, Physiological, and Growth Characteristics of Sugarcane (Saccharum spp.)

Effects of nitrogen applications on transpiration, physiological, and growth characteristics of sugarcane

by Dinh Thai Hoang
Received: May 21, 2023 / Published: Jun 30, 2023
Abstract: 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.   

Impacts of Dietary Supplementation of Peptidoglycan Extracted from Lactobacillus sp. on the Growth Performance and Resistance to Streptococcus Agalactiae of Nile Tilapia

Impacts of dietary supplementation of peptidoglycan extracted from Lactobacillus sp.

by Nguyen Thi Mai, Mai Van Tung, Do Hoanh Quan, Vu Thi Thanh Huong, Nguyen Thu Hang
Received: Mar 14, 2023 / Published: Jun 30, 2023
Abstract: The current experiment aimed to determine the effects of peptidoglycan, known as a prebiotic compound, on the growth, feed efficiency, and disease resistance in Nile tilapia. Fish at an initial body weight of 22.6 ± 0.3g were distributed into a 100 L-glass tank system. Peptidoglycans extracted from Lactobacillus sp. were added to commercial feed at ratios of 0, 5, and 10 g kg-1 diet corresponding to the PG0, PG5, and PG10 treatments, respectively. Fish were then fed at 4% their body
weight for four weeks. After a 4-week trial, fish were infected with Streptococcus agalactiae at 50% the lethal dose (1.1×106 CFU mL-1), and monitored for 14 days. After 2 and 4 weeks of the feeding trial (T2 and T4) and on the second day of the bacterial challenge, fish blood samples were collected for hematological analysis. The results indicated that the dietary supplementation of peptidoglycan induced a positive effect on fish growth performance and the highest value was observed in the PG5 treatment. The lowest value of cumulative mortality was also observed in the PG5-fed fish indicating that the dietary supplementation at 5 g kg-1 diet supported the highest resistance to S. agalactiae. In conclusion, the beneficial effects of dietary supplementation of peptidoglycan extracted from Lactobacillus sp. were recorded on the growth performance and disease resistance in Nile tilapia.

Ethnic Minority Farmers’ Perceptions of Climate Change and Its Effects on Crop Production in Northwest Vietnam: A Case Study of H’mong Farmers in Pa Lau Commune, Tram Tau District, Yen Bai Province

Ethnic minority farmers’ perceptions of climate change and its effects on crop production in Northwest Vietnam

by Nguyen Thi Bich Yen, Tran Nguyen Bang, Pham Thi Hai Luyen, Giang A Tu, Tran Duc Vien
Received: Feb 9, 2023 / Published: Jun 30, 2023
Abstract: This study aimed to assess the perception of H'mong farmers in the northwest mountainous region on climate change, its impacts on crop production, and their adaptation strategies. Reports on natural disaster events and their damages for the period ranging from 2012-2021, together with meteorological data including daily temperature and precipitation for 1991-2021, were collected. Fifty households among the H’mong farmers were randomly selected from four villages of Pa Lau commune for
interviews based on structured questionnaires. The results showed that most H’mong farmers know that the climate is changing. However, their perceptions of the trends of these changes in terms of rainfall, temperature, and extreme weather events were not consistent with the analysis of meteorological data. The results also revealed that this is because the farmers evaluated the changes mainly based on their observations of short-term climate changes and the associated impacts that directly affect their livelihoods. The farmers perceived that soil erosion and hot and extreme cold weather have tended to increase their impacts on the production of some major local crops. Other types of natural disasters such as droughts, floods, landslides, pests, and strong winds have tended to have more or less impacts depending on the crop type. Adaptation measures taken by farmers to mitigate the effects of climate change are mainly simple, flexible, seasonal and low-cost measures. This study provides basic information for authorities at all levels to mitigate the negative impacts of climate change.

Applying the Theory of Planned Behavior to Determine the Influencing Factors of Recycling Pig Wastewater for Crop Cultivation in Hanoi City

Appplying the theory of planned behavior to determine the influencing factors of recycling pig wastewater

by Nguyen Thi Huong Giang, Tran Cong Chinh, Tran Duc Vien, Nguyen Tat Thang; Ngo The An
Received: Dec 5, 2022 / Published: Jun 30, 2023
Abstract: The study was conducted to analyze the factors affecting the use of pig wastewater for crop cultivation in Hanoi city. Through the application of the Theory of Planned Behavior to develop the theoretical framework and structural equation modeling, the study showed that the behavior intention influenced the recycling behavior. Attitude toward the behavior (AT), social norms (SN), and perceived behavioral control (PBC) were important influencing factors on the intention to perform this behavior
with standardized regression coefficients of ß = 0.96 (P <0.001), ß = -0.826 (P  <0.001), and ß = -0.34 (P <0.001), respectively. These research results serve as the initial reference for policies and studies related to the use of pig wastewater.