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Physical Appearance andGrowth Performance of IndigenousGoat Co, F1 (Bach Thao×Co) and Three Way Crossbred Goat [Boer×(Bach Thao×Co)]Raised in Nho Quan,Ninh Binh Province

Pham Kim Dang, Nguyen Ba Mui

Received: 15-04-2015 / Accepted: 13-05-2015
The present study was carried out at households in Nho Quan district, Ninh Binh province to determine the appearance characteristics and growth performance of indigenous goat (Co),F1between Bach Thao (BT)xCo (BT×Cỏ),and three way crossbred Boerx(BT×Cỏ). Results showed that Co goat had heterogeneouscolor hair, mostly yellow (54.47%). The F1 cross (BT×Cỏ) had four legs are longer than its’s Co and the ears are bigger but straight. Crossbred goats(Box (BT×Cỏ)) commonly have color same color of the male Boer breed (brown (37.11%) or Black heads (21.64%). They havelarge and balanced body size,well developed muscles, and big drooping ears. Body weight of[Bo × (BT×Cỏ)]cross wasalways highest. Male goats showed body weight higher than the females at all ages.The average daily gain (ADG) of the three way cross [Bo × (BT×Cỏ)](81.66g) was remakably higher than BT×Cogoat (66.71 g) and Co (47.12g) (P<0.05). Males have absolute growth rate higher than female goats atmost of stages of age evaluated.
Behavior of the Leaf eating Moth Hypocala subsaturaGuene(Lepidoptera: Noctuidae) Damaging on Imported Sweet Persimmon Cultivar MC1 (Fuyu) in Hoa Binh, Viet Nam

Le Quang Khai, Nguyen Viet Tung, Le Duc Khanh

Received: 24-11-2014 / Accepted: 09-03-2015
Leaf eating moth Hypocala subsatura Guene (Lepidoptera: Noctuidae) is main insect pests on imported sweet persimmon MC1 (Fuyu) in Hoa Binh, Viet Nam. The catepillars can cause severe yield losses in sweet persimmon by damaging new flushes. Six to twelve hours after hatchment mating occurred and mostly took place during night time. Addition of 10% honey to feed, the longevity of female last to 13.5 days, longer than male (about 12.2 days). Pre-oviposition period was 2 days; oviposition period was recorded highest during 4, 5 and 5 days; post-oviposition period was 1-2 days (at 28°C and 70%). Eggs were laid singly on the young leaf surface of the branches which are not affected directly by the sun. The first, second and third instars live in group but 4th and 5th instars start to spread out to the midribs of large leaves and young shoots. 70% of larvae pupated on the soil surface in the cocoons made from dead leaves and other plant debris while 26.67% pupatedin soil at a depth of 0-3cm and 3.33% pupated at the depth of more than 3cm in the soil.
Effects of Cutting Time on Yield, Chemical Composition of Two Sorghum Lines (OPV86 and OPV88) and Quality of Ensilaged Sorghum

Nguyen Xuan Trach, Nguyen Thanh Nhan, Bui Quang Tuan, Pham Van Cuong

Received: 04-08-2014 / Accepted: 30-08-2014
An experiment was conducted to evaluate effects of diferent cutting points on yieldandchemical composition of two new sorghum linesas well as quality of the ensilage. A total of 24 plots were arranged accoding to a completely randomized block design with 3 replicates to grow the two sorghum lines and4 cuttingpoints at different phases of plant growth. The cut materials were choped into 3-5cm in length by a slicer and mixed with supplements in small containers (3kg/container) for sillage making according to the following treatments: whole folliage at start of flowering, whole folliage with flowers, whole folliage with milky seeds, and whole maturefolliage with left flowers. It was found that the new sorghum lines had good growth with high green matter yield (72.45 to 101.14 ton /ha). Sorghum whole folliage at start of flowering, whole folliage with flowers, whole folliage with milky seeds can be easily made silage with 0.5% NaCl or 0.5% NaCl plus 5% molasses. The silage can be preserved for 3 months with low pH (3.80-4.29), low moulded proportion (2.39 to 3.56%), and low HCN content (6.97-7.74 mg/kg).
Effects of Temperature on Embryonic Development and MalflormationEof Pompano,Trahinotus blochii

Tran Thi Mai Huong, Nguyen Thi Nien, Dam Thi My Chinh, Le Van Khoi, Nguyen Huu Ninh

Received: 27-07-2016 / Accepted: 28-12-2016
The experiment of the effect of temperatureeffecton embryonic development and malformation of pompano (Trachinotus blochii) was carried out at the Northen National Broodstock Center for Marine aquaculture oin Cat Ba, Hai Phong, Vietnam. Five temperature levels of 24oC, 26oC, 28oC, 30oC and 32oC were studied with 3 replicates each. The results showed that,there was a significant differencetbetween five treatments in terms of hatching, deformity and survival rates. The result indicated that the significant highest hatching rate was 47.7% at 24oC. The lowest deformity rate was observed at 24oC (3.3%) but no significant difference was found between 24oC, 26oC and 28oC. The survival rate was higher at 26oC (58,6%) and 28oC (58,2%) after five days of post-hatching than other. The results show that sSuitable temperatures for pompano incubation are ranged from 24oC to 28oC. At 26oC and 28oC, the lowest deformity rate (3,98 - 4,20%) and the highest survival rate (10.48% and 10.69%) after 40 days of post hatching were recorded. From this study, the temperature rangedfrom 26 - 28oC are recommended for pompano rearing.
Adaptation to Climate Change in Agricultural Production of Local People in Coastal Giao Thuy District, Nam Dinh Province

Dang Thi Hoa, Quyen Dinh Ha

Received: 18-06-2014 / Accepted: 01-09-2014
Climate change is one of the phenomena that has a strong impact on the nature and human life in many countries, including Vietnam. The extreme weather phenomenon such as prolonged heat, coldness, floods, droughts, sea level rise...have impacted negatively on agricultural production activities, particularly in coastal areas. Giao Thuy district is one of Nam Dinh province's coastal areas, which has abundant and various resources and good conditions to facilitate development of agricultural production. However, the district at the same time faces withseveralthreats and risks caused by storms, floods, tides, sea level rise..., causing tremendous damage to infrastructure and human lives. To respond to climate change, local governments and citizens in Giao Thuy district have takencertain actions to adapt with the climate change to develop agricultural production. This articleprovidesthe first impact assessment of climate changein Giao Thuy district, with emphasison agricultural production and adaptation measures used in agricultural production in Giao Thuy district, Nam Dinh province. Some measures to enhance adaptive capacity of communities to prevent and minimize harm, stability and development of agriculture in climate change conditionswere also recommended.
Growth Rate, Carcass and Meat Quality of Crossbreds between F1(LandracexYorkshire) Sows and (PiétrainxDuroc) Boars with Piétrain ReHal Genetic Difference

Pham Thi Dao, Nguyen Van Thang, Vu Dinh Ton, Do Duc Luc, Dang Vu Binh

Received: 22-01-2013 / Accepted: 18-03-2013
The study was carried out at 3 pig farms in Hai Dương and Hưng Yên from March 2011 to January 2013 to evaluate growth rate and carcass quality of F1(Landrace x Yorkshire) (F1(L x Y)) sows mated with F1(Piétrain x Duroc) (PiDu) boars with Pietrain ReHal genetic constitution (25, 50 và 50%: PiDu25, PiDu50, PiDu75). The results showed that these crossbreds obtained high growth rates and low feed conversion ratio (FCR) (829.42 g/day and 2.31 kg/kg; 797.78 g/day and 2.33 kg/kg; 765.79 g/day and 2.38 kg feed/kg weight gain, respectively). Lean meat percentage of PiDu25 x F1(L x Y), PiDu50 x F1(L x Y) và PiDu75 x F1(L x Y) were 54.66, 56.32 and 59.97 %, respectively. Lean meat percentage of PiDu75 x F1(L x Y) was higher than that of PiDu25 x F1(L x Y) and PiDu50 x F1(L x Y). The meat quality traits in terms of pH, colour drip loss, and firmness of 3 crossbreds were normal. Crude protein of musculus longissimus dorsi of crossbreds was 21.53, 22.18 and 22.63%. The research suggests that using crossbed boars PiDu25, PiDu50, PiDu75 to mate with F1(L x Y) sows helps to obtain high performance in pig farms.
Tiếpcậntíndụngcủacáchộchănnuôi: NghiêncứutạitỉnhHảiDương, ViệtNam

Le Thi Minh Chau, Philippe Lebailly, Nguyen Tuan Son

Received: 06-11-2012 / Accepted: 17-12-2012
Trong những năm gần đây,cung cấp tín dụng cho nông thôn từ khu vực chính thức đã tăng trưởng đáng kể. Tuy nhiên đầu tư tín dụng cho nông nghiệp còn chưa đáp ứng được nhu cầu về tín dụng cho sản xuất và chưa tương xứng với đóng góp của nông nghiệp cho sự phát triển kinh tế và xã hội trong khu vực nông thôn. Nghiên cứu này sử dụng số liệu điều tra từ hộ chăn nuôi ở Hải Dương và kết quả của nghiên cứu chỉ ra rằng tín dụng cung cấp từ khu vực chính thức vẫn chưa đáp ứng được nhu cầu về tín dụng của các hộ chăn nuôi. Tỷ lệ người phụ thuộc, diện tích đất trồng trọt, diện tích ao, số lượng lợn thịt là các yếu tố liên quan đến nhu cầu vay của hộ về tín dụng từ khu vực chính thức. Ngoài ra, tuổi, trình độ học vấn của chủ hộ, diện tích ao cá là yếu tố cơ bản ảnh hưởng đến khả năng tiếp cận tín dụng của hộ từ các ngân hàng được phản ánh bằng số tiền vay nhận được. Những hạn chế trong cung cấp tín dụng nông thôn của khu vực chính thức cũng gây trở ngại cho tiếp cận tín dụng của người chăn nuôi.
Density Variation of the Leafminer Chromatomyia horticola (Goureau)(Diptera; Agromyzidae) on Cucumber at Gia Lam, Ha Noi

Hoang Thi Hang, Ho Thi Thu Giang

Received: 27-03-2012 / Accepted: 12-05-2012
Chromatomyia horticola (Diptera; Agromyzidae) were reared from the collected leaves. This leafminer was found infesting 11 vegetable species at Gia Lam, Ha Noi. C. horticola commonly infests tomato, cumcuber and garland chrysanthemum,being most abundant in spring and winter cropping season. The density of and the rate of damage by C. horticola were lowest in late winter season, but there was no significant difference between main and early season. Previous crops affect the density of C. horticola on curcumber. The density C. horticola was also lowest in the field that plants were not found hosts as wax gourd. The density of the leafminer in crossed curcumber higher than in local curcumber.
Developing Community-based Tourism Associated with Agricultural Production in Ba Vi District, Hanoi

Doan Thi Ngoc Thuy, Nguyen Thi Thu Trang, Nguyen Thi Kim Oanh

Received: 23-02-2022 / Accepted: 07-04-2023
This study aimed to analyze the current situation of community-based tourism development associated with agricultural production in Ba Vi district, Hanoi city. The study was conducted on local officials and farmer households participating in the community tourism associated with agricultural production and 187 visitors using direct interview. Collected data were processed through SPSS software and Cronbach alpha coefficients, factor analysis and regression analysis were employed to assess the satisfaction of tourists on community-based tourism associated with agricultural production. The results show that tourism development to satisfy tourists in the area relied on 6 factors, viz. accommodation (0.365), food and beverage (0.318), infrastructure (0.286), service price (0.178), experience activities (0.169), and tourist service staff (0.165). Therefore, in order to further develop the community-based tourism associated with agricultural production in Ba Vi district, local authorities and tourist site managers need to invest and upgrade infrastructure, accommodation facilities, expanding catering services and shopping activities, diversifying experience activities and improving service skills of tourist staff.
Growth, Physiology and Yield Responses ofGroundnut (Arachis hypogea L.) to Drought Stress

Vu Ngoc Thang, Nguyen Ngoc Quat, Nguyen Thu Huyen, Le Thi Nga, Lam Thi Sam, Duong Thi Cam Linh, Nguyen Thuy Ha, Vu Ngoc Lan, Le Thi Tuyet Cham, Tran Anh Tuan

Received: 06-03-2024 / Accepted: 21-06-2024
The study was conducted to select drought tolerant and high yielding groundnut varieties for development in production. The two-factor experiment was arranged in a split-plot designin nethouse at Vietnam National University of Agriculture in the Autumn2022. The first factor were six groundnut varieties (LC1, LC2, LC3, LC4, LC5, ĐBG) and the second factor included drought stress and non-drought stress condition. The results showed that drought stress reduces growth, physiology and yield (plant height, primary branch length, leaf number on main stem, nodule formation, chlorophyll fluorescence efficiency, SPAD index, number of pod/plant, individual yield) while increasing water saturation deficit and ion leakage. Comparison among varieties showed that LC3 and LC2 were more tolerant with high drought tolerance index (0.72 and 0.69, respectively) and low yield reduction due to drought (36.53% and 35.00%, respectively).
Evaluation ofSalt Tolerance of Newly Collected Rice Accessions

Nguyen Anh Dung, Vu Van Liet

Received: 27-11-2023 / Accepted: 07-03-2024
This study was carried out to evaluate agronomic characteristics, salttolerance and the presence of QTL Saltolof newly collected rice accessions throughfield experiment,artificial salinity treatment and molecular identification. The experiments on agronomic characteristics and salt tolerance were carried out according to the method of IRRI, 1997 and 2013 at the FieldCrops Research Institute, Gia Loc district, Hai Duong province whilemolecular marker analysis was conducted at Vietnam National University of Agriculture, Gia Lam district, Ha Noi city. Theevaluation results showed that the rice accessions were diverse in growth duration, plant height, flag leaf length, and panicle length. Out of 39 accessions, 6 promising ones were selectedwith good salt tolerance: Lua soi, M3, HHZ8-SAL6-SAL3-SAL1, HHZ8-SAL6-SAL3-Y2, HHZ12-SAL8-Y1-SAL1 and Hasawi IRGC 16817and 22 rice accessions carrying SaltolQTL. Thus, the selection of materials for breeding salt-tolerant rice varieties should combine the evaluation of agronomic characteristics with artificial salt tolerance assessment and molecular markers.
Effects of Dietary Supplementation with Herbal Mixed Powder on GrowthPerformance, Gas Emission and Clostridium perfringensin Manure of Growing Pigs from 30-60kg

Vu Dinh Ton, Nguyen Thi Nga, Nguyen Van Duy, Nguyen Thi Trang, Hoang Minh Duc

Received: 25-07-2022 / Accepted: 07-03-2024
This study aimed to evaluate the effects of dietary supplementationwith herbalplants mixture on growth performance, gas emmission of NH3 and H2Sand Clostridium perfringens(C. perfingens) bacterium inmanure ofgrowingpigs from 30-60kg. Experimental pigs were divided into three groups, a control group without herbal plants mixture and two groups with two different levels of herbal plants mixture supplementation, 15 grams or 20 grams for one kg of feed. The supplementation with 15 grams and 20 grams herbalplants mixture improved the average daily gain by 11.67% and 13.45%, respectively, compared with the control.After 28 days of using feed with supplementation herbalplants mixture, the concentration of NH3emissions from pig manure in experimental group 1 (TD1)and experimental group 2 (TD2)has decreased by 51.58% and 49.47%, respectively, and the concentration of H2S in TD1 group and TD2 group has decreased by 13.92% and 51.03%, respectively, compared to the control group. The concentration of C. perfringensin the TD1groupand TD2groupdecreased by 23.17% and 27.35%, respectively, compared with the control group. The supplementationherbalplants mixture at 20 grams per kilogram of feed had better effect on reducing H2S emissions and the concentration of C.perfringensin pig manure than adding 15 grams of herbalplants mixture per kilogram of feed.
Evaluation ofSalt Tolerance of Newly Collected Rice Accessions

Nguyen Anh Dung, Vu Van Liet

Received: 27-11-2023 / Accepted: 07-03-2024
This study was carried out to evaluate agronomic characteristics, salttolerance and the presence of QTL Saltolof newly collected rice accessions throughfield experiment,artificial salinity treatment and molecular identification. The experiments on agronomic characteristics and salt tolerance were carried out according to the method of IRRI, 1997 and 2013 at the FieldCrops Research Institute, Gia Loc district, Hai Duong province whilemolecular marker analysis was conducted at Vietnam National University of Agriculture, Gia Lam district, Ha Noi city. Theevaluation results showed that the rice accessions were diverse in growth duration, plant height, flag leaf length, and panicle length. Out of 39 accessions, 6 promising ones were selectedwith good salt tolerance: Lua soi, M3, HHZ8-SAL6-SAL3-SAL1, HHZ8-SAL6-SAL3-Y2, HHZ12-SAL8-Y1-SAL1 and Hasawi IRGC 16817and 22 rice accessions carrying SaltolQTL. Thus, the selection of materials for breeding salt-tolerant rice varieties should combine the evaluation of agronomic characteristics with artificial salt tolerance assessment and molecular markers.
Effects of Dietary Supplementation with Herbal Mixed Powder on GrowthPerformance, Gas Emission and Clostridium perfringensin Manure of Growing Pigs from 30-60kg

Vu Dinh Ton, Nguyen Thi Nga, Nguyen Van Duy, Nguyen Thi Trang, Hoang Minh Duc

Received: 25-07-2022 / Accepted: 07-03-2024
This study aimed to evaluate the effects of dietary supplementationwith herbalplants mixture on growth performance, gas emmission of NH3 and H2Sand Clostridium perfringens(C. perfingens) bacterium inmanure ofgrowingpigs from 30-60kg. Experimental pigs were divided into three groups, a control group without herbal plants mixture and two groups with two different levels of herbal plants mixture supplementation, 15 grams or 20 grams for one kg of feed. The supplementation with 15 grams and 20 grams herbalplants mixture improved the average daily gain by 11.67% and 13.45%, respectively, compared with the control.After 28 days of using feed with supplementation herbalplants mixture, the concentration of NH3emissions from pig manure in experimental group 1 (TD1)and experimental group 2 (TD2)has decreased by 51.58% and 49.47%, respectively, and the concentration of H2S in TD1 group and TD2 group has decreased by 13.92% and 51.03%, respectively, compared to the control group. The concentration of C. perfringensin the TD1groupand TD2groupdecreased by 23.17% and 27.35%, respectively, compared with the control group. The supplementationherbalplants mixture at 20 grams per kilogram of feed had better effect on reducing H2S emissions and the concentration of C.perfringensin pig manure than adding 15 grams of herbalplants mixture per kilogram of feed.
Isolation and Selection of Antagonistic Bacteria Against AlternariaalternataCausing Leaf Spot Disease on Cucumber

Nguyen Thi Lien, Nguyen Nhut Hao, Nguyen Lam Minh, Nguyen Tang Phu

Received: 07-08-2023 / Accepted: 26-01-2024
Alternarialeaf spot on cucumber causes serious damage to marketable fruit yield and quality. The study was carried out to select bacterial strains from the cucumber rhizosphere soil with antagonistic activity against Alternariaalternata. The isolates were evaluated for their antifungal activity by dual culture method. The antagonistic isolates were investigated for their ability to produce hydrolytic enzymes and siderophore. The antifungal activity of volatile organic compounds was evaluated by the Petri dish inversion method. Twelve isolates exhibited antagonism against A. alternata. Growth inhibition of A. alternataby these isolates ranged from 9.7 to 47.8%. Eight isolates showed the ability to produce siderophore. All isolates were capable of producing hydrolytic enzymes (β-1,3-glucanase, chitinase, protease). Chitinase had a strong correlation with the ability to inhibit the growth of the pathogenic fungus (P <0.05). Volatile organic compounds of 12 antagonistic strains showed the ability to inhibit the growth of spores (61.8-95.2%) and mycelium (58.9-79.7%) of A. alternataThe results of this study indicated the potential of rhizobacteria in controlling A. alternatacausing leaf spot in cucumbers.
Establishment and Optimization of Realtime PCR Assays for Detecting Disease in Shrimp Caused by Decapod Iridescent Virus 1

Truong Dinh Hoai, Nguyen Thi Huyen, Nguyen Thi Kim Oanh, Vu Dang Thang, Nguyen Dang Hong Ngoc, Nguyen Thanh Loan, Au Xuan Khoa, Vu Thi Lan Huong, Nguyen Thi Thuy Man

Received: 28-07-2023 / Accepted: 26-01-2024
The study was conducted to establish, optimize and validate the real-time PCR assay for the detection of Decapod iridescent virus 1(DIV1) and control of this disease in shrimp. The plasmid samples containing two target genes MCP and ATPase of DIV1 were used to establish and optimize the procedure using different probe concentrations 0.1, 0.15 and 0.2µM. The sensitivity, performance, specificity, inter-assay stability, and interlaboratory matching results from nationally and internationally standardized laboratories were used to evaluate the efficacy and validity of these real-time PCR assays. The results of real-time PCR using plasmids containing target MCP and ATPase genes at a probe concentration of 0.2µM revealed the best detection ability. The reaction detection limits were 13.6 and 14.3 plasmid copies/reaction with the efficiency at 98.9% and 92.6%, respectively. The assays exhibited high specificity (no reaction to all shrimp-positive samples for WSSV, IHHNV, AHPND, and EHP) and high stability (CV < 15%). The study results showed that two real-time PCR assays using plasmids carrying target MCP and ATPase genes of DIV1 established in this study could ensure reliability and applicability to laboratories for screening and controlling DIV1 disease in Vietnam.
Phân lập, nhận diện và đặc tính sinh học của xạ khuẩn sinh enzyme chitinase ở vườn quốc gia Yok Đôn

Dinh Minh Tran, To Uyen Huynh, Anh Dzung Nguyen

Received: 15-08-2020 / Accepted: 25-12-2023
Việc tạo ra phân bón sinh học mới là lĩnh vực rất được quan tâm trong nông nghiệp hiện đại. Nghiên cứu này tập trung vào xạ khuẩn có hoạt tính chitinase cao, tạo màng sinh học, thúc đẩy sinh trưởng và kháng nấm bệnh hại cây trồng. Trong nghiên cứu này, hai chủng xạ khuẩn YSS-3.3 và YWS-5.1 được phân lập từ các mẫu đất và giá thể chitin thu tại vườn quốc gia Yok Đôn ở Tây Nguyên. Các chủng này có hoạt tính chitinase cao và tạo màng sinh học. Phân tích trình tự gen 16S rRNA cho thấy chúng có quan hệ di truyền gần gũi nhất với loài Luteimicrobium album, với độ tương đồng trình tự 99,41% và độ phủ trình tự 100%. Phương pháp nuôi cấy trên đĩa thạch chỉ ra rằng các chủng xạ khuẩn sở hữu hoạt tính thủy phân cellulose và tinh bột; hòa tan kẽm, kali và phosphate khó tan; và tổng hợp siderophores. Phân tích bằng UV-HPLC cho thấy các chủng này cũng sản xuất hormone tăng trưởng cây trồng như IAA, GA3 và zeatin. Kỹ thuật nuôi cấy kép chỉ ra rằng các các chủng xạ khuẩn có hoạt tính đối kháng nấm Fusarium oxysporum. Từ những cơ sở trên, L. albumYSS-3.3 và L. albumYWS-5.1 là các ứng cử viên tốt cho các nghiên cứu tiếp theo liên quan đến ứng dụng trong nông nghiệp. Các chủng này cũng là nguồn nguyên liệu tiềm năng để thực hiện các nghiên cứu sâu về trình tự bộ gen, hệ thống chitinase, cellulase và amylase của chúng.
Effects of Growing Mediaand Cutting Typeson Propagation of Black Pepper (Piper NigrumL.)

Nguyen Thi Loan, Luc Thi Quyen

Received: 05-05-2023 / Accepted: 20-11-2023
The experiment aimed to determine the suitable type of growing media and node number per cutting for pepper propagation in Dak Mil district, Dak Nong province. A two-factor experiment was laid out in the nursery in a randomized complete block design with 3 replicates. The first factor consisted of 5 growing media (G1: red basalt soil (soil); G2: 60% soil + 40% coir dust; G3: 60% soil + 20% coir dust + 20% vermicompost; G4: 60% soil + 40% perlite; G5: 60% soil + 20% perlite + 20% vermicompost). The second factor consisted of 3 cutting types (H1: two-node cutting; H2: three-node cutting; H3: four-node cutting). The results showed that growing media containing coir dust and vermicompost and cuttings with higher node number increased the survival rate and shooting rate, stimulated root growth, increased cutting growth and dry matter accumulation of black pepper cuttings. Growing four-node cutting on the growing media mixed from 60% soil + 20% coir dust + 20% vermicompost resulted in best viability rate, shooting rate, growth and biomass of pepper cuttings.
Heterosis and Combining Ability of Yield and Quality Traits of Purple Cherry Tomato Lines

Nguyen Trung Duc, Nguyen Thi Nguyet Anh, Pham Quang Tuan, Vu Duy Hoang, Vu Van Liet

Received: 21-12-2022 / Accepted: 04-08-2023
This studywas designed toevaluate the heterosisand general combining ability (GCA) of ten S3purple cherry tomato lines based on the Line×Tester model to select elite parental lines with high combiningability in terms of yield and quality. Ten cherry tomato lines, three testers, thirty crosses,andtwo checks were evaluated based on 11 agronomic traits in 2022 Autumn-Winterseasonin Hanoi under polyhouse. The results showedthat purple tomato varieties can be created by crossing purple tomato lines with purple or red cherry tomato lines. The mid parent and best parent heterosis showed negative values in almost all traits and crosses investigated. D10 hada significant positive GCAeffectformarketable yield. Three lines viz.,D3, D6, and D9 had significant positive GCAeffect fortotal soluble solids content.Two dark purple cherry tomato crosses viz., D10×T3 (38.1 tons/ha, 9.0Brix) and D6×T3 (35.2 tons/ha, 9.8Brix) showedbreeding potential to develop new cherry tomato lines in the next segregation generation
Biological Characteristics and Biocontrol of Fusarium oxysporumf. sp. cubense Causing PanamaDiseaseon Banana

Le Thi Loan, Nguyen Tuan Vu, Vu Dang Toan, Nguyen Duc Huy

Received: 10-05-2023 / Accepted: 29-06-2023
Panamadisease is a letal fungal diasese caused by the soil-born fungus Fusarium oxysporumf. sp. cubense(Foc). This study aimedto identify isolated Focstrainsandexaminetheir biological characteristics and the antagonistic effects of some antagonistic microbial agents against Fusarium oxysporumf. sp. cubenseisolated from collected samples. The morphological characteristic of the fungus Fusarium oxysporumf. sp. cubensetropical race 4(Foc-TR4) cultured on PDA medium varied from white to pale purple, with no spore cluster formed. There were two types of asexual spores: microconidia and macroconidia. Microconidiawereusually without septum, ovoid, oval, and 1.0-2.1 × 2.2-3.0µm in size. Macroconidiawerewith 2-5 septa, mostly with 2-3 septa, crescent-shaped with average size varying from 2.6-3.2 × 9.2-35.5µm. The pathogen Foc-TR4grew at temperatures from 15-35C. The optimum temperature for fungal growth was 25C. The appropriate pH for Foc-TR4fungus to grow and develop well was 6.0-7.0. The diameter of the fungal colony rangedfrom 74.8-77.9mm. The results of evaluating the antagonistic effect against Foc-TR4on PDA medium showed that Trichoderma asperellumgave the highest inhibitory effect (74.52%), followed by the Chaetomium globosumC10 at 67.35% and Bacillus velezensisYB9 at 61.33%. The results of this study provide more information about Foc-TR4strain and the biological controlof banana wiltdisease.
Effect of Collecting Methods on the Quality of Ban Pig Frozen Semen in Porcine in vitroEmbryo Production

Do Thi Kim Lanh

Received: 25-04-2023 / Accepted: 29-06-2023
The present study was carried out to evaluate the quality of Ban pig semen collected by two different methods: extraction from epididymis and ejaculation. After thawing, three parameters of Ban pig sperm including sperm motility, concentration and live rates were evaluated. The results showed that the quality of the Ban pig epididymal semen (TL03) was better than that of the ejaculated semen (HB02). The concentration and sperm motility after thawing affected the rate of embryo cleavage after IVF. Porcine oocytes fertilized with TL03 semen showed cleavage rate of 77.2%,higher than that of oocytes fertilized by HB02 crystal group (58.6%). The rate of blastocyst formation between the two groups was not affected by the two factors mentioned above, but it was influenced by the percentage of post-thaw live spermatozoa. The blastocysts formation rate of porcine oocytes fertilized with TBL03 semen was 29.6% which was higher than that of oocyte group fertilized with HB02 semen (18.2%, P = 0.016). Therefore, assessing the percentage of live spermatozoa plays an important role in determining the development ability of IVF porcine embryos.
Effect of Reverse Logistics Practices on Sustainable Development: A Literature Review

Han Huyen Huong, Nguyen Thi Thuy, Nguyen Thi Duong Nga

Received: 21-03-2023 / Accepted: 21-06-2023
Almost all nations in the world today pay increasing attention to sustainable development because of environmental issues and resources degradation. Reverse logistics plays an important role in achieving the sustainable development goals of any organization. The purpose of this study is to provide a literature review of effect of reverse logistics practices on sustainable development’s triple bottom line. Content analysis was used to analyse the selected papers. Results of the study reveal that reverse logistics has possitive impacts on sustainable development through 5 economic, 4 environmental and 5 social indicators. However, some studies has shown vague economic and social effects of reverse logistics.
Effects of Combining Soil and Foliar Fertilization on Growth, Developmentand Yield ofEggplant

Thieu Thi Phong Thu, Tran Thi Thiem, Phung Xe Pa

Received: 06-12-2022 / Accepted: 27-03-2023
The experiment aimed to determine the suitable types of organic fertilizer for the growth, development and yield of eggplant in Gia Lam, HaNoi.Atwo-factor experiment was laid out in randomized complete block design comprising 8treatments with three replications. The first factor wassoil fertilization withP1 - Chicken manure, P2 - Minori fertilizer, P3 - Inorganic fertilizerandP4 - Vermicompost. The second factor wasfoliar organic fertilization with C1 - O-MIC and C2 - HB101 (plant vitalizer). Research results showed that vermicompost exhibitedthe best effectson the growth and yield of eggplant. Foliar application of HB101 brought better effectson the growth and yield of eggplant compared to application of O-MIC. Combined use of vermicompost and HB101 foliar vitalizer gave the highest eggplant yield of 14.05 tons/ha, 2.89 tons/ha higher than the yield in combination ofinorganic fertilizerandO-MIC and 2.39 tons/ha higher than the yield inthe combination ofinorganic fertilizerand HB101.
Evaluating Rice Crop Insurance Demand in the Mekong Delta

Nguyen Van Tac, Nguyen Tri Khiem

Received: 16-01-2023 / Accepted: 03-04-2023
To contribute to the development of rice crop insurance in the Mekong Delta, this study aimed to estimate the willingness to pay and identify the factors affecting the willingness to pay of rice farmers. Thestudy was conducted through the insurance scenario of rice yield index due to weather, climate and disease risks by contingent valuation method in the form of double-bounded dichotomous choice. The article data were collected from direct interviews with 463 rice farmers in the Mekong Delta in 2019. Results show that 47.5% of respondents agreed with both the first premium and the next higher premium when asked while 17.1% of individuals disagreed with both premiums even though the second was recommended lower and 35.4% of other cases. The average willingness to pay was estimated to be 68.633 VND/1,000m2/crop. The research results also pointed out the factors affecting the willingness to pay of rice farmers such as education, production costs, dikes, selling price, loans, other incomes and risk response.
Use of PCR Method for Identification of Meat of some Livestock Species

Nguyen Thuong Thuong, Tran Bich Phuong, Nguyen Thai Anh, Do Duc Luc, Nguyen Hoang Thinh

Received: 08-12-2022 / Accepted: 03-04-2023
The PCR test method is widely used in the multiplication of specific DNA fragmentssince it issensitive and inexpensive, and can be used universally in the routine laboratory. This study used PCR to develop a procedure to accurately identify three types of meat (beef, pork, and chicken) in raw and heat-treated forms(30 samples total). The primer set was designed with forward primer for all three species and specific reverse primer for each species. The results show that DNA fragments weresuccessfully amplìied with specific size band of 274, 398 and 227 bp (specific for cows, pigs and chickens,respectively).This study indicates that genes in individual and mixed samples of two and three meats representing two and three different speciescan be identifiedwith the limit of detection down to 0.16 ng/µl.

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