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NghiêncứukhảnăngkếthợpvàsửdụngchỉthịphântửSSR dòtìmgen lg1vàlg2tronglaiđỉnhhaidòngthửMo17 vàB73 vớicácdòngtựphốingôláđứng

Hoang Thi Thuy, Vu Thi Bich Hanh, Tran ThiThanh Ha, Duong Thi Loan, Nguyen Van Ha, Vu Van Liet

Received: 07-08-2015 / Accepted: 05-05-2016
Nghiên cứu thực hiện đánh giá khả năng kết hợp chung của tám dòng tự phối ngô về tính trạng lá đứng và năng suất hạt sử dụng mô hình line × tester trong vụ xuân 2015; và để phát hiện hai gen lg1 và lg2trong các dòng bố mẹ này cũng như con lai F1sử dụng chỉ thị phân tử SSR. Mười sáu tổ hợp lai đỉnh và các dòng bố mẹđược đánh giá trong vụ xuân 2015 trong thí nghiệm khối ngẫu nhiên hai lần lặp lại. Kết quả xác định góc lá trung bình của ba lá trên bắp nhận thấy dòng E1, E5 và cây thử Mo17 có góc lá từ 30-35othuộc nhóm lá gọn, các dòng còn lại có góc lá < 30othuộc nhóm lá đứng. Giá trị hướng lá (LOV) cũng cho thấy kiểu cây của các dòng và tổ hợp lai thuộc nhóm cây gọn. Chúng tôi xác định chỉ có tổ hợp lai 15 có góc lá <30o thuộc nhóm lá đứng, sáu tổ hợp lai có góc lá >35othuộc nhóm lá thường, và các tổ hợp lai còn lại thuộc nhóm lá gọn. Ước lượng giá trị khả năng kết hợp chung (KNKH) của 8 dòng và 2 cây thử, kết quả cho thấy3 dòng là E4, E7, E8 và cây thử Mo17 có giá trị âm KNKH về góc lá, nghĩa là góc lá có xu hướng hẹp hơn. Sáu dòng có giá trị KNKH dương về năng suất là E1, E2, E3, E4, E6 và Mo17. Sử dụng chỉ thị SSR với hai mồi đặc hiệu umc1165(dò tìm gen lg1) và bnlg1505(dò tìm gen lg2) ở các dòng bố mẹ, THL, kết quả cho thấy mức độ đa hình cao và đã nhận biết được các dòng và THL mang gen lg1và lg2. Kết quả này gợi ý rằng có thể sử dụng chỉ thị phân tử SSR trong chọn lọc trợ giúp nhờ chỉ thị phân tử (MAS) để sàng lọc vật liệu và chọn giống ngô lá đứng cho trồng mật độ cáo.
Combining Ability of Erect Leaf Maize Inbred Lines for Yield and Leaf Angle

Nguyen Van Viet, Vu Van Liet, Vu Thi Bich Hanh, Hoang Thi Thuy, Duong Thi Loan, Tran Thi Thanh Ha, Nguyen Van Ha

Received: 30-03-2018 / Accepted: 20-06-2018
This experiment was conducted to evaluate the combining ability of erect leaf maize inbred lines for grain yield and leaf angle using tester x line analysis. Twelve erect leaf maize inbred lines and three testers, T1, T2 and T3, were crossed in a tester x line scheme in 2017 spring season. Growth and development of thirty-six testcrosses, the check GS9989, and fifteen parental lines were evaluated in a randomized complete block design in 2017 winter season. Results showed that the lines had leaf angle in the range from 26.5o to 30.8o; whle leaf angle of testcrosses varied from 24.1o to 43.1o. Three lines, D3, D6 and D9 showed high GCA values and can be used in hybrid breeding program. D9 line had significant GCA and high variance for SCA, thus, it is a valuable source in maize breeding. The T3 tester had higher GCA effect for leaf angle and yield and T2 tester had higher effect for leaf angle. Five testcrosses, T3xD3 (72.8 tons per ha); T3xD6 (72,2 tons per ha); T2xD9 (70.2 tons per ha); T3xD9 (83.1 tons per ha) and T2xD10 (77.1 tons per ha) with erect leaf and yield being higher or equal to the check GS9989, are promising for further testing and large scale demonstration for releasing new hybrids suitable for high density cultivation.
Ảnh hưởng của một số thông số làm việc chính đối với việc giữ hạt trong bộ phận gieo ngô kiểu khí động kết hợp với đĩa nghiêng

Nguyen Xuan Thiet, Nguyen Chung Thong

Received: 22-12-2020 / Accepted: 02-03-2023
Ngày nay, máy gieo hạt kiểu khí động thường sử dụng bộ phận nhận hạt kiểu đĩa thẳng đứng. Hạn chế của bộ phận gieo hạt này là hiệu suất nhận và giữ hạt thấp. Để nâng cao khả năng hút và giữ hạt trong quá trình gieo, đĩa nhận hạt trong bộ phận gieo được đặt nghiêng so với phương thẳng đứng (bộ phận gieo kiểu khí động kết hợp đĩa nghiêng). Nghiên cứu đã được thực hiện theo phương pháp nghiên cứu thực nghiệm đơn yếu tố nhằmxác định các thông số làm việc chính của bộ phận gieo kiểu kiểu khí động kết hợp với đĩa nghiêng. Kết quả cho thấy trong quá trình gieo đĩa nghiêng làm việc hiệu quả hơn đĩa đặt thẳng đứng trong việc nhận và giữ hạt. Cụ thể, các nghiên cứu tập trung xác định ảnh hưởng của các thông số chính như: áp suất hút, đường kính lỗ chứa hạt, vận tốc của lỗ chứa hạt, góc quay của đĩa gieo đến khả năng nhận và giữ hạt.Kết quả thực nghiệm cho thấy bộ phận gieo ngô kiểu khí động kết hợp với đĩa nghiêng làm việc hiệu quả với các thông số làm việc chính như sau: Áp suất chân không 50 mmHg-100 mmHg; đường kính lỗ hạt 4-5,5mm; vận tốc lỗ đĩa gieo hạt nhỏ hơn 0,68 m/s và đĩa gieo tạo với phương thẳng đứng một góc 20-35 độ.
Vertical Oscillation Model of Sowing Machine Combined with Fertilization for Soybean

Nguyen Chung Thong, Le Minh Lu, Nguyen Xuan Thiet, Nguyen Thi Hanh Nguyen

Received: 10-08-2020 / Accepted: 23-02-2021
This study presents the result of building the vertical oscillation model of the conjugate machine (sowing machine combined with fertilization for soybean (G4B2 machine) and tractor). The fluctuations of special points on the conjugate machine are described graphically through numerical methods by Matlab software when the parameters of the stimulus function change, in two cases: the continuous stimulating function and the single stimulating function cosine form. The tractor has a four-link hinge knuckle at the back, when working in the free state, the G4B2 machine oscillation affected by tractor oscillation is very small. The point near the wheel of the G4B2 machine has a smaller amplitude of oscillation than the remote point.It is necessary to decrease the feeding speed when combining the machine through the rough ground with large amplitude (h0 > 0.15m) and small steps (S0 < 1.0m).
Farmers’ Compliance with Pesticide Use Principles in Vegetable Production in Thanh Hoa City

Le Van Cuong, Ngo Thi Thuan

Received: 23-03-2017 / Accepted: 29-06-2017
The compliance with pesticide use principles is required in agriculture production, especially in vegetable production due to its relation to food safety, human health, environment and economic efficiency. This study used primary data from a survey of 99 vegetable farmng households in Thanh Hoa city to evaluate the situation and determine the factors affecting the farmers’ compliance with pesticide use principles. Exploratory Factor Analysis with 25 specific criteria was used to determine the impact of each principle on farmers’ compliance. The results showed that the “Right pesticide for a right crop’’ principle had the highest impact, followed by the principles "Right method of application" and “Right dose and ingredient’’. Therefore, to enhance the famers’ compliance with pesticide use principles, it is necessary to strengthen the propaganda, training, management and supervision on the pesticide use according to the priority of the impact level of the aforementioned principles.
Effects of Application of Good Hygiene Practice (GHP)in Pork Delivery on Food Hygiene and Safety of Pork

Pham Thi Thanh Thao, Nguyen Xuan Trach, Pham Kim Dang

Received: 28-10-2019 / Accepted: 08-01-2020
Food hygiene and safety (FHS) is always one of the top consumer concerns when choosing food, including fresh pork. However, the system of quality and food safety management has been poorly applied in pork delivery in Vietnam. This research aimed to assess effects on FHS of pork of application of good hygiene practice (GHP). The studywas designed following the model of the intervention-control clinical trial, using10 traditional markets. The chosen markets were randomly divided into two groups: the GHP group with 5 markets to apply GHP, whereas the non-GHP group with the other 5 markets to sell pork as before. At the beginning and end of the study, awareness and practice of FHS of the butchers were assessed through the interview using semi-structured questionnaires; at the same time the levels of microbial contamination of pork, equipment, and water were evaluated with sample analyses. It was found that application of GHP significantly improved awareness of pork hygiene and right practices for personal hygiene of butchers and reduced microbial contamination on the fresh pork, equipment, and water.
Assessment of ImplementingCompensation, Supportand Resettlement in the Course ofLand Acquisition forInfrastructureProjects in Van Don District, Quang Ninh Province

Do Thi Tam, Dang Tien Si, Pham Thi Tuyen, Dang Hung Vo

Received: 22-10-2014 / Accepted: 19-01-2015
This study aimed to investigate the currentperformance in compensation, supports and resettlement in Van Don District. Data collection, survey, synthesis and comparative methodwere usedto evaluate the compensation, supports and resettlement of 2 key projects in Van Don District. Most of the land owners agreedthat the compensation,supports and resettlement have been implementedon time and compliedwith the laws. However, there were some limitations related toconpensation(compensation price lower than market value;payment by cash). Proposed solutions for these problems are Improving the capacity of institution in managing land, especially, in termsof land registry; compensation policy diversification;long-term aids and employment policies.
Assessing the situation of resolving agricultural land disputes between householdsand individuals in Lang Son province

DoThi Duc Hanh, Tran Quang Trung

Received: 12-03-2024 / Accepted: 12-06-2024
The study aimed to point out the advantages, limitations, and causes in the process of resolving disputes over-allocated or leased agricultural land, recognizing land use rights for households, individuals, and proposing solutions to resolve disputes completely, on time, and according to regulations in Lang Son province. Data were collected from authorities and from surveys using pre-prepared questionnaires on 175 households and 164 officials directly involved in dispute resolution. From 2016 to 2022, 4,012 disputes were resolved, an average of 2.87 cases/year/commune. Conciliation successfull and unsuccessful rate, respectively, was 72.18%; 27.82%. First-instance judgments without appeal accounted for 90.50%; the remaining 9.50% have appealed. The disputing parties had well complied with the settlement conclusions. The biggest limitations when resolving disputes were poor cadastral records; insufficient human resources, limited coordination to resolve the issue, people in dispute having limited legal knowledge, and administrative procedures were not simple. Solutions include completing cadastral records and administrative procedures; promoting propaganda and dissemination of laws; ensuring enough human resources to resolve disputes; and strengthening coordination between authorities.
Phisical Model of the Vertical Cone-Shaped Screw Mixer

Luong Thi Minh Chau

Received: 29-01-2016 / Accepted: 10-06-2016
Physical model built for the vertical cone-shaped screw mixer consists of two physical models to determine the capacity and productivity of the vertical cone-shaped screw mixer. Based on the physical models we built vertical cone-shaped screw mixers identical with that of optimum parameters. Research process for the different machine models to raise productivity in calculating, design, manufacturing can be shortened but vertical cone-shaped screw mixers with optimal work fitting to the different power and productivity could be achieved.
Effects of Gamma Co60Irradiation for Some Local and Imported Rice Varieties

Nguyen Thi Mien, Nguyen Trong Khanh, Tran Van Quang

Received: 05-08-2021 / Accepted: 29-10-2021
This study was carried out to effects of gamma ray irradiation of irradiation Co60 source forsome local and imported rice accessions. This experiment was designedwith 3 dose (200Gy, 300Gy and 400Gy) on the mutagenesisof three rice (12% seed humidity). At generation M1, the results showed that the seed germination and survival percentage of all rice accessions decreased with the increase of the irradiation doses. Mutated plants with shorter growth duration, lower plant height, more upright flat leaves appeared, greater tillering capacity with high mutation frequency at irradiation dose of 200Gy, 300Gy for imported rice varieties NN1, NN3 in the M2generation. The mutation appeared with very low frequency when irradiating the local rice variety Khau Mang. Selection on M3generation of 200Gy and 300Gy irradiation treated varieties NN1 and NN3 picked up some promising rice lines with short growth duration, short plant height, more upright flat leaves appeared and high tillering capacity. To sum up, gamma Co60irradiation at 200Gy and 300Gy dose on dried seeds could renovated some agronomic traits such as growth duration, plant height, flag leaf morphology and tillering capacity on two imported rice varieties NN1 and NN3.
Accounting Situation in Agricultural Cooperatives in An Giang Province

Vu Thi Hai, Phi Thi Diem Hong, Nguyen Van Phuong

Received: 06-07-2021 / Accepted: 09-12-2021
The study described the current status of accounting activities in agricultural cooperatives and identified errors and shortcomings existing in the accounting activities of those cooperatives, thereby proposed remedial solutions as "lessons" for other cooperatives inside and outside the province. The survey was conducted on 58 agricultural cooperatives in An Giang province. The research results showed that (i) the cooperatives’ accountants were mainly part-time, the rate of untrained was still high; (ii) accounting documents has not updated or applied incompletely and in accordance with the current regulations on financial report; (iii) some accounting operations were not recorded, information was omitted or some items were incorrectly presented in the financial report; (iv) the inspection and control of cooperatives was still formal and ineffective. In order to overcome these shortcomings, cooperatives and supporters need to focus on improving management capacity and strengthening training more on accounting activities, development of business and production plans, market access, knowledge and practice of financial management, internal control, and prioritization of specialized people in the cooperatives.
Evaluation on Capacity of Professional Colleges in the Red River Delta Region at Periods of Integration

Dong Thi Van Hong, Ngo Thi Thuan

Received: 08-04-2014 / Accepted: 13-05-2014
Despite the remarkable contribution to the training progress of skilled labour for economic sectors, the professional colleges face with challenges of educational qualities and competitiveness under the globalization and economic integration. In this study, the analysis regarding the capacity of those colleges were categorized in 3 aspects as such, organization and management, education quality, and infrastructure and teaching facilities according to the requirements of the Ministry of Education and Training. The results indicated that the State-owned colleges had higher capacity in comparison with those under management of private enterprises. Regarding colleges’ capacity evaluation, the number of colleges that satisfied the requirement referred to organization and management capacity showed the highest of percentage (86.4%), while the figures for education and training qualities and the infrastructure and teaching facilities were 80,8 percent and 79,6 percent, respectively. 93.2 percent of the colleges in the province met the requirements for the first criterion on training goals and missions, while only 61.7 percent satisfied the criterion on library quality. Among 50 evaluation criteria, some criteria reached rather low value: 20% for the teaching materials, 40% for teaching material quality, 40.3 percent for financial budgeting, 45% for education transfer program and 55% for international cooperation and accommodation. These findings can serve as practical basis to find suitable solutions for improving capacity of professional colleges in professional education.
Some Measures to Prevent and Minimize Wide-scale PowerOutages

Received: 10-10-2013 / Accepted: 17-07-2014
A wide-scale power outrage is a loss of electric power with low probability but dangerous such that it causes great economical and social damage. The power system disintegration resulting in wide-scale power blackouts is a complex phenomenon brought about by different causes. The disintegration of a power system results from a process of separating or losing electric lines or generation units, which happens continuously until it completely divides into isolated regions or areas. The underlying causes derive from the stage of planning, designing, operating, or maintaining, which lead to dangerous wide-scale power outrages. However, for many different reasons, both subjectively and objectively, the investigation of the causes, mechanisms and phenomena bringing about the wide-sclae power outrages was not taken into consideration.
Method CalculatingEnergy Losses for Medium Voltage Grid Base on R.M.S Current

Received: 13-05-2014 / Accepted: 18-07-2014
The article presented the method of energy loss calculation for the medium voltage transmission grid based on root mean-square current. Although the energy loss for the medium voltage transmission grid has been studied by many authors and proposed approximate calculation methods, it is inadequate for the application of such methods for concrete condition of the medium voltage grid in our country. By using statistical probability theory and the concrete condition of the medium voltage grid, the energy loss calculation method prốped semed to be conveniently and accurate in collecting data required..
Molecular Marker for Using to Detect Fragrant Gene in Aromatic Rice Breeding

Duong Xuan Tu, Nguyen Van Khoi, Le Thi Thanh, Nguyen Thi Huong, Nguyen The Duong, Tran Thi Dieu, Phan Huu Ton

Received: 29-04-2014 / Accepted: 18-07-2014
DNA markers RG28, RM223, RM342, L06 and BADH2 comprising 4 primers EAP, ESP, IFAP, INSP have been reported closely linked to fgr gene located on chromosome 8 controlling 2AP synthesis, major materials producing aroma in rice. In our report, marker BADH2 (4 primers EAP, ESP, IFAP, INSP) yielded in high polymorphism and could accurately differentiate between fragrant and none-fragrant rice material. Analysis of F2 population derived from cross between aromatic and non-aromatic rice varieties using this marker showed approximate ratio of segregation of 1: 2 : 1 . Using this marker, from 92% to 95% of F2 individuals expressing aroma in grains were identified as homozygotes for fgr gene. These results confirmed the accuracy of BADH2 marker with 4 primers EAP, ESP, IFAP, INSP to detect fragrant gene in aromatic rice breeding materials.
Development of Pig Farming for Porkin Thanh Hoa Province

Pham Xuan Thanh, Luong Thi Dan, Mai Thanh Cuc

Received: 03-06-2014 / Accepted: 08-09-2014
Pig farming for pork or pork productionis an important industry of the agricultural sector in Thanh Hoa province. In recent years, thanks to well management of local governments, pig rearing in the province has gradually developed; nevertheless, it is not really sustainable. Data gathered from statistical reports, especially from published statistical data on pig farming in general and pig farming for pork in particular were analyzedto evaluate the status and advantages anddisadvantages of pork production in the province. Some solutions for future pork production were recommended..
Chemical Composition and Apparent Metabolizable Energy (AME) of PaddyRice and Brown Rice for Chicken

Ton Thát Son Phong, Vu Duy Giang, Ton That Son

Received: 02-05-2017 / Accepted: 09-06-2017
chúng tôi tiến hành xác định thành phần hóa học, giá trị năng lượng trao đổi (ME) của thóc và gạo xay làm thức ăn cho gà bằng phương pháp trực tiếp Farrell (1978). Mẫu nghiên cứu được lấy từ 6 giống lúa trồng phổ biến ở Việt Nam là Bắc Ưu, BC 15, Khang Dân, Q5, Tạp giao và IR50404. Kết quả cho thấy thành phần hóa học và giá trị ME của thóc và gạo xay biến động theo các giống lúa. Hàm lượng protein thô, lipit thô, xơ thô, tro thô và DXKN (Dẫn xuất không nitơ) của thóc 6 giống lúa tương ứng (theo 100% vật chất khô) là 7,36 - 8,78%; 3,43 - 3,97%; 7,88 - 11,62%; 1,88 - 4,31% và 73,22 - 78,23%. Với gạo xay, các giá trị tương ứng là 8,00 - 10,91%; 2,85 - 4,96%; 1,48 - 2,32%; 1,09 - 1,66% và 81,43 - 85,77%. Giá trị ME thóc và gạo xay được xác định trực tiếp trên gà là 3,134 - 3,490 kcal và 3,668 - 3,884 kcal/g vật chất khô.
Assessment The Implementation of Some Land Use Rights in Tu Son Town, Bac Ninh Province

Do Thi Tam, Do Thi Duc Hanh, Do Manh Huy

Received: 21-03-2017 / Accepted: 24-05-2017
The study aimedto investigate the implementation of some land use rights (LUR) in Tu Son Town and proposedsolutions to improve the efficiency of implementation of LUR. The results showed that in the period 2010 - 2015, there were 4,293 transfer transactions, 1,757 donation transactions,7,915 mortgage transactions and 1,074 inheritance transactions in Tu Son Town. The procedure for implementing LUR at the Land Registration Office was easy to understand and implement. Most of the transactions were done according to the appointment.Theimplementation ofregulations related to LURandthe search forLUR transactions were relatively easy. However, fees, taxes and transfer taxes were high. In order to improve the effectiveness of implementation of LUR in Tu Son Town, the following comprehensive measures should be taken:enhancingpropagationand dissemination of laws, simplifyingimplementation procedures of LUR, increasing investment in facilities completingthe land use levy collection policy and buildinga comprehensive land database.
Solutions to Complete the LandAcquisitionfor Development of Infrastructure and Urban Improvement in Nam Dinh City, Nam Dinh Province

Nguyen Thi Thu Huong, Phan Thi Thanh Huyen, Nguyen Thanh Tra, Pham Phuong Nam

Received: 30-07-2018 / Accepted: 15-10-2018
A study was conducted in Nam Dinh city, Nam Dinh province, to evaluate the current situation and propose solutions for land acquisition. Results showed that in the 2010-2017 period, the city of Nam Dinh carried out land acquisition in 41 projects with a total area of 86.81 ha for infrastructure and urban improvement. The investigation results of 400 households and individuals whose land was recovered showed that the land acquisitionin Nam Dinh city was carried out in accordance with the procedure; however, a small percentage of households assessed that the determination of land price and support were not appropriate. The SWOT analysis of land acquisitionin Nam Dinh city suggested four following solutions to overcome the weaknesses of land acquisition: (1) rearranging organization of land acquisition, compensation, support and resettlement; (2) managing and updating cadastral files; (3) mobilizing capital; and (4) propagating and disseminating land legislation.
Current SituationandUse of Preferential Loan by Students of Vietnam National University of Agriculture

Vu Ngoc Huyen, Le Thi Thanh Hao

Received: 11-05-2018 / Accepted: 05-03-2019
In order to clarify the current situation and use of preferential loan, data were collected from 255 students and alumni at Vietnam National University of Agriculture, who had borrowed and not borrowed preferential loans from the Vietnam Social Policy Bank in the period of 2014-2016. Results showed that nearly 67% of students borrowed 4-8 times, of which 30% borrowed in 6 semesters, accounting for the highest proportion of loans. Ninety four percent of students used the loan for tuition fees, living expenses, housing, and materials. Tuition fees accounted for the highest proportion (90%) while living expenses such as lodging, and eating accounted for 44.25%. The average student loans increased but it only met 49% of the cost for education. The study also showed that the loans had a positive impact on students’ education, learning outcomes, extracurricular activities and employment. Based on theses results, three main solutions were proposed: (1) Considering loan grant to non-policy students; (2) Lending with the maximum amount according to the state regulations; (3) Continuingto raise the annual maximum loan amount.
Study on Biological Characteristics of Onychostoma laticepsGunther, 1896

Vo Van Binh, Nguyen Hai Son, Nguyen Quang Huy

Received: 13-05-2019 / Accepted: 17-07-2019
In order to maintain, protect and develop the gene source of Onychostoma laticeps, the study of biological characteristics of O. laticepswas carried out from January 2018 to December 2018 on 300 samples of O. laticepscollected in the Giang River, Mon Son commune, Con Cuong district, Nghe An province. Results showed that all collected fish samples were in the age of ranging from 1+-3+, corresponding to the weight of 22.5-98.8 g/fish. The O. laticepsis an omnivorous species (Li/Lo was 3.08 ± 0.57). The food composition in the fish intestines was diverse, including more than 28 species, representing for 5 different animal and plant sectors, of which the algae sector was dominated (65%) compared to other sectors. There were no much differences between the Fulton fat coefficient and Clark fat coefficient, this was reflected correctly the level of the nutrient that was accumulated in fish. In nature, O. laticepsstarted breeding in early February, the average absolute fertility was 3,113 eggs, the average relative fertility was 231 eggs/g of the female. The gonosomatic index (GSI) was high during the period from February to June (Male fish ranged from 1.81 to 2.12%; Females fish from 4.62-9.80%) and reached the highest value in March (Male fish: 2.64%; Female fish: 9.80%).
Expansion of Fruit Crop Area in Son La Province

Nguyen Huu Giap, Nguyen Mau Dung

Received: 25-09-2019 / Accepted: 11-10-2019
ThestudyaimstoestimatethesituationoffruitproductioninSonLaandanalyzetheadvantageanddisadvantageindevelopingfruitproduction;Hence,tosupportthesolutionstosustainabledevelomentoffruitinSonLaprovince.TheresearchusedsecondaryandprimarydatatoanalyzethestatuscurrentoffruitproductioninSonLaprovince.Theresearchmethodologysuchasdescribedstatisticalanalysis,comparative,forecastingtoassessthedevelomentoffruitareainSonLaprovince.TheresultsshowthatSonLaprovincehas58,824haoffruitsandthetotaloutputaround220,304tonsin2018.Meanwhile,theprovince’sagriculturesectorplantargetedat100,000haand1,100,000tonsoffruitsby2020.Theareaoffruitsincreased35.6%inthe2015-2018period.MocChau,YenChau,MaiSon,SongMa,MuongLaandThuanChaudistrictswereconcentratedfruitproductionareaswithcomparativeadvantages.Themainfruitsincludedmango,longan,banana,avocado,Taiwancrabapple,dragonfruitandpassionfruit.TheexportvalueofmainfruitproductsreachedoverUSD13.9million2018.Theactorssuchascooperatives,enterprisesandpeoplewerecloselylinkedinthedevelopmentoffruitsinSonLaprovince.Therewere41fruitcooperativesmeetingVietGAPstandardsand228hagrantedplantingcodesintheprovince.However,thedevelopmentoffruitsinSonLaprovincefacedseveraldifficultiessuchasdividedterrainconditions,slopeland,unprdictableweather,andlowproductionlevelofpeople.Tosustainabledevelopfruitproduction,SonLaprovinceneedstosimultaneouslyapplyeconomicandtechnicalsolutions,namelyplanningtheconcentratedproductionareas;applicationofscientificandtechnicalmeasurese inharvestandprocessing;formallinkageofactorsfromproductiontoconsumption;tradepromotionandproductadvertissment;andimprovementofpeople’stheproductionlevel.
Experimental treatment of intestinal giant cystic disease caused by Thelohanellus kitaueiinfecting Common carp (Cyprinus carpio)

Nguyen Van Tuyen, Tran Thi Diu, Pham Thi Tham, Doan Thi Nhinh, Kim Van Van, Truong Dinh Hoai

Received: 19-05-2020 / Accepted: 04-09-2020
This study was conducted to determine the effective treatment regimen to mitigate the impact of the disease caused by Thelohanellus kitaueifor common carp. A total of 60 suspected common carp infected T. kitaueifrom 20 cages were collected to confirm the pathogens. Subsequently, the experimental treatments were conducted to treat for those infected fish using four different treatment regimens, including praziquantel, ivermectin, albendazole, and triclabendazole in 3 consecutive days, following with 5 consecutive days using antibiotic (doxycycline at dose of 15 mg/kg fish/day)to treat the lesions in fish intestine for all four treatment regimens. The results revealed that the fish in cages were infected T. kitauei. Infected fish exhibited the lost orientation, enlarged abdomen, and containing many giant cysts in the intestine with the average size is 1.43cm x 1.12cm. The experimental results indicated that the treatment regimen using a dose of 10mg praziquantel/kg fish/day was not effective with a low cure rate (24.92%). The treatment regimens with the dose 0.6mg ivermectin/kg fish/day or 6mg triclabendazole + 6mg albendazole/kg fish/day or 10mg albendazole + 10mg praziquantel/kg fish/day resulted to higher the cure rates, 90.48%, 85.62%, and 86.86%, respectively.
Gastrointestinal Tract Morphology and Clark Index of the Linecheek Tank Goby Glossogobius sparsipapillus Caught from Coastal Estuaries of Bac Lieu and Ca Mau Provinces

Tran Tri Canh, Nguyen Huu Duc Ton, Nguyen Thi Thuy Hien, Dinh Minh Quang

Received: 08-11-2020 / Accepted: 24-12-2020
This study was aimed to provide data on gastrointestinal tract morphology and the relationship of Clark indexand gender, season and sampling site variables of the Linecheek tank goby Glossogobius sparsipapillus. Fish specimens were sampled monthly using trawling nets from September 2019 to August 2020, at three sites in Bac Lieu and Ca Mau provinces. After catching, the samples were determined sex, total length and weight, gastrointestinal tract morphology, gut length and Clark index.The analysis results of 729 specimens showed that this species had a long and pointed snout, flattened head, the mouth was wide and oblique, the lower jaw protruded, and the incision extended to the front eye. There were many rows of teeth on each jaw. It was a carnivorous fish as its intestine length was shorter than the total length of fish (RLG ranged from 0.18to0.83(0.44 ± 0.00)). This species had a high energy storage capacity due to the high value of the Clark index. The Clark of this species varied with season, sampling site, month and season × sampling site, but not gender, gender × sampling site and gender × season. The results have contributed to understanding in future aquaculture of this species.
Tourists’ Preferences toward Ecotourism Product and Biodiversity Conservation in Bavi National Park

Thai Thi Nhung

Received: 05-05-2021 / Accepted: 29-07-2021
This paper analyzed tourists’ preferences for ecotourism products associated with Biodiversity Conservation in Bavi National Park to support the decision-makers in ecotourism development process. Choice experiments were employed to examine the preferences of 180 tourists for the attributes of ecotourism products associated with Biodiversity Conservation and to estimate their willingness to pay for these ecotourism attributes. Using a Conditional Logit Model, the research results indicated that tourists had a preference for ecotourism products with all attributes except for visiting without exploiting traditional medicinal plants of the Dao ethnic minority.The tourist’s marginal willingness to donate to biodiversity conservation at VND5000 /time was VND100.7 thousand. The study also revealed that tourists were willing to donate for biodiversity conservation activities even higher than donation level suggested by the Park.

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