Vol. 16 No. 7 (2018)

This study assesseddrought tolerance and some agro-biological characteristics of rice lines imported from International Rice Research Institute (IRRI) in Thua Thien Hue province with experiments conducted in laboratory induced drought condition and on rice field with non-active irrigation. The results of laboratory induced drought experiment showedthat introduced rice lines from IRRI hadthe germination rate in the range of 39,57-89,67% when KClO3 2% solution was used, the radicle length variedfrom 0,64cm to 3,07cm. Some of varieties showedsignificant drought tolerance when there was no watering during seedling stage and branching stage. The results of experiments on field with no irrigation showedthat the introduced rice lines from IRRI hadgrowth duration varying from 111 to127 days and belonged to medium and long-day plant group; plant heights varyiedfrom 73,5 to 122,3cm; vegetative tiller was in the range of 9,2-21,2 tillers; effective tiller was 6-17tilers. The productivity factors and theoretical productivity were relatively high in some rice varieties. Most of the rice varieties showedgood adaptation to drought in the condition of non-active irrigation in Winter-Spring crop in Thua Thien Hue province.

The study was conducted to estimate the effect of using of nano-metal compounds containing Fe, Cu, Zn and Se in diets on blood biochemical and physiological parameters of LV broiler chickens. The experiment was designed in a three-factor experiment: (1) metallic complex (CT1, CT2, 15, 20, 25 and 30%), (2) sex (cock and hen) and (3) age (4, 8 and 12 weeks of age). A total of 108 blood samples of LV broiler chicken (54 cocks and 54 hens) was taken to analyze the blood physiological and biochemical parameters. The results showed that the number of red and white blood cells and hemoglobin content increased (P <0.05) when nano-metal complex from 15% to 30% was added to the diet. The number of red blood cells of the cocks was higher than the hens fed 15% and 25% metal complex. Hemoglobin content of the cocks was higher than that of the hens when 25% and 30% metal complex was supplemented. Serum protein, albumin and globulin content of hens and cocks were not statistically significant (P >0.05). The blood physiological and biochemical parameters of LV broiler chickens were highest in the 8th week and the lowest in the fourth week of age. The use of nanometal compounds with level equal to 15, 20, 25 and 30% of inorganic metal compounds did not only increase number of red and white blood cells and hemoglobin content but also reduce inorganic metal compounds in ration for commercial LV broiler production.

This study was conducted to evaluate the effects of dietary canthaxanthin on growth and skin color of permit (Trachinotus falcatus) cultured in sea cages. Four formulated diets with the same nutritional composition (45% protein and 15% lipid) were supplemented with canthaxanthin at 0 mg/kg, 40 mg/kg, 80 mg/kg and 120 mg/kg. Yellow color on the body and fins of the fish was evaluated by colorimetry using Yolk Color Fan. The growth, feed conversion ratio and survival of the fish were not significantly different (P >0,05) after 30 days of culture. However, the yellow color on the body and fins was markedly different among treatments. Fish fed diet supplemented with with 120 mg canthaxanthin/kg had higher yellow scores than those fed control diet (0 mg/kg) and 40 mg/kg diet (P <0,05). There was no difference in color score between treatments supplemented with 0, 40 and 80 mg canthaxanthin/kg. The results showed that supplementation of 120 mg canthaxanthin/kg diet effectively enhanced skin color of permit.

This study was investigated to find out the diversity of bacteria co-cultivatedwith microalgae Chlorella.Bacteria were isolated from two non-axenic algal cultures of Chlorella sp. strains C2 and C6 originated from soil using agar plates of 10- and 102-fold diluted nutrient broth.Based on the similarity of the almost full length 16S rRNA gene sequences, the type strains of species phylogenetically closely related to the isolated strains and neighbor-joining tree, the strains were identified at the genus level. Sixteen bacterial strains were isolated and identified as species of seven genera as follows: Caulobacter,Shinella,Aminobacter,Variovorax,Polaromonas,Brevundimonas,Emticicia. The study showed the diversity and abundance of bacteria co-cultivated with non-axenic cultures of algae.

This study was conducted to investigate CH4 emission as influenced by different organic matter forms from rice straw applied to paddy field (Eutric Fluvisols) planted with rice culivar Khang Dan 18 in the Spring and Summer seasons of 2015 and 2016. Keeping inorganic NPK level constant (100 kg N, 80 kg P2O5 and 80 kg K2O/ha), organic matter amendments included chopped rice straw (4500 kg/ha1), biochar produced from rice straw and compost (produced from 4500 kg rice straw). The emission rates of CH4 were measured by using the closed chamber method. Results showed that CH4 emission rates differed markedly with the forms of organic matter application. Pure application of mineral fertilizers yielded lowest CH4 emission rate but highest rice grain yield. In contrast, amendment with chopped rice-straw resulted in highest CH4 emission rate and lowest rice grain yield. Biochar and compost application lowered CH4 emission rate as compared with rice straw amendment. However, application of compost maintained rice yield comparable to mineral fertilizer.

The objective of this study was to determine effect of salinity levels of irrigated water on growth, yield and proline production of rice varieties grown on saline-affected soil. A 5 x 4 factorial experiment including 5 rice varieties (Pokali - salt tolerant, IR28 - susceptible, OM5451, MTL547 and OM8017) and 4 salinity levels (0-control, 3, 4, và 5‰) was arranged in a randomized complete block design with four replicates in greenhouse. Results showed thatrice variety OM8017 gained the highest plant height, filled grain number per panicles, 1.000 grain weight, and rice yield, whereas rice variety MTL547 accumulated the highest proline production. Besides, saline irrigation water with a salt concentration of ≥3‰ decreased plant height, number of panicles, filled grain number per panicle, 1.000 grain weight, and rice yield. Rice yield was reduced by 20.0, 57.3 and 56.6% when irrigated with water containing 3, 4 and 5‰ salinity, respectively. Proline accumulation in rice stalk and sodium content in soil increased with increasing salinity levels.

This research was carried out to identify optimal protocol for separating omega-3 and omega-6 fatty acids from perilla seed oil with high yield and quality. The perilla oil was first hydrolyzed into fatty acids by sodium hydroxide solution in 80% ethanol to yield free fatty acids. The next step was to enrich the polyunsaturated omega-3 and omega-6 in the resultant fatty acids mixture via complexation with urea in ethanol. The suitable conditions of complexation were as follows: urea to fatty acid ratio of 2:1 (w/w), ethanol to fatty acid ratio of 9:1 (v/w), and complexation temperature of 0C for 5 hrs. The total content of omega-3 and omega-6 fattyacids accounted for 94.86 % in the final product.

The aim of this study was to evaluate the probiotic potential of 60 Bacillus strains isolated from chichken intestine to produce probiotic preparation for use in the poultry industry. Three strains, RGB6.11, RGB7.1, and RGB8.8, were selected with good probiotic characteristics such as tolerance to low pH (pH 1.0; 2.0; 3.0) after 3 hrs culture, tolerance to 0.3% bile salt after 4 hrs culturing OD620nm >0.44, production of extracellular enzymes with ring diameter of substrate resolution from 13-21 mm, resistance to gastrointestinal pathogens Salmonella Typhimurium and Escherichia coli with zone of inhibition diameter 9-14mm, and good adhesion ability on chicken intestinal epithelium. Moreover, suitable cultural temperatures (30-40oC) and pH (6.5-7.0) for these strains were identified. The three Bacillus spp. strains were suggested for species identification and production of probiotics for the poultry industry.

In our study, we used statistical models based on multivariate linear discriminant analysis, logistic regression and SVM methods to construct bank classification functions for early risk warning for Vietnam joint stock commercial banks The models were built on attribute groups such as profitability, deficit indicators, asset management efficiency, asset quality, safety level, sustainable growth rate and liquidity. The study calculates the accuracy of the research models on both data sets and tests, in addition to the types of mistakes of type I, mistakes of type II that models suffer from.

Smart Agriculture (SA) is one of the outcomes of the fourth industrial revolution. This paper highlights concepts, interrelated elements and technology tendencies and curent situations of SA in the world and Vietnam. The paper also points out the benefits, challenges and training and research issues for Vietnam to adopt SA. Finally, the paper suggests some viewpoints and orientations for renovating research and training agriculture’s human resource in the country including renovation of training and research approaches; continuation of restructuring agriculture sector by renovating public investment and services in agriculture research and training and moving from resource-based development strategy to renovation and innovation-based one; prioritizing SA where applicable but still considering traditional farming; implemetation of SA’s R and D program; encouraging start-ups in development and application of SA’s technologies; renovation of training program by closely meeting society’s demand, overcoming market failures in training, renewing training contents and training modes, strengthening linkages with other stakeholders; updating technologies of the industry 4.0 for training human resource in digital physical, biological and operational technologies; more attention for training in knowledge and skills for current agriculture labor force