Trong các mô hình nuôi tôm sú, đặc biệt là mô hình nuôi tôm bán công nghiệp (bán thâm canh) và nuôi tôm công nghiệp (thâm canh), mật độ nuôi tôm dày, sử dụng thức ăn công nghiệp dạng viên và các loại thuốc, men sinh học thường xuyên. . dày đặc của tảo lam trong ao nuôi. Khi tảo lam phát triển trong ao nuôi, là dấu hiệu cho thấy nền đáy ao nuôi đã quá dơ bẩn, môi trường nước ao nuôi đã ô. Hiện ...
Thuốc dùng trong nuôi trồng thủy sản dùng trong các trường hợp có thể đem lại như: Quản lý môi trường nuôi, Phòng và trị bệnh, Tăng sức đề kháng và sức khỏe vật nuôi, Tiêu diệt tác nhân gây bệnh, địch hại và sinh vật mang mầm bệnh và nói những loại thuốc dùng . Nhóm thuốc dùng trong nuôi trồng thủy sản 2008 NHIM DOC 3 Các phương pháp dùng thuốc trong nuôi trồng thủy sản 2008 4NHIM DOC Phương pháp ...
SummaryFor rapid propagation of Carica papaya L, in-vitroculture method was tried using young shoot-tips as explants. The explants were surface sterilized using 15% Ca(0Cl)2 for 15 minutes and 0. 1% HgCl2 for 3 minutes (double sterilization). The young shoot-tips were cultured on the MS medium supplemented with αNAA (0.2ppm), BA (0.5ppm) and kinetin (0.5ppm) for multiple shoot induction. After ...
SUMMARYIn 2004 a total of 340 households in 10 sugarcane-growing communes of two districts (Tho Xuan in Thanh Hoa province and Quy Hop in Nghe An province) were surveyed. It was found that sugarcane was the main crop of the households with an average of 3500-3850 sq.m. of sugarcane each. Every year each household could have 5-7 tones of sugarcane tops as a byproduct. The byproduct was either used ...
SUMMARYAn experiment was conducted from April 2001 to November 2002 at a Robusta coffee farm in Buon Ma Thuot (Daklak province) to compare the effect of mineral, compound and biological fertilizers on the yield of coffee. Results indicated that the fertilizer type significantly affected the yield of coffee. Application of Conco compound fertilizer increased the yield by 19.58% in comparison with ...
SummarySeven inbred lines. viz. VN1, VN2, VN3, VN4, VN5, VN6, VN7 selected by the National Maize Research Institute were topcrossed to two lines, A10 and A20 introduced from India as testers in 2002 spring cropping season. Topcross perogeny was evaluated in autumn-winter season in the same year. The software Topcross 1 was employed to evaluate the combining ability (CA) of the yield traits. The ...
SummaryStudy was carried out on home buffaloes in 11 communes of 3 districts from 3 highland provinces (Phong Tho -Lai Chau; Dien Bien - Dien Bien and Simacai - Lao Cai) of the Northern Viet Nam. Result showed that: The reproduction rate of home buffaloes was high on average 44,84%, some places 50,0%. The age at first calving was 36 - 48 months in 28,17%, > 48 - 60 months in 50,51% anh higher 60 ...
SummaryThe tissue culture technique was applied for rapid multiplication of Tai-nung 4 pineapple, a Taiwanese pineapple variety of good quality. The thin layers of the shoot tip were cultured on the MS medium supplemented with 2.5% saccarose, 6.5g agar/l, 0.6 ppm of 2,4 D and 0.05ppm kinetin. The percentage of regenerated plants obtained on this medium was 65.2% after 30 days of culture with a ...
SummaryThe paper briefly presents the results in 2000-2001 on fruit formation and development of Robusta coffee investigated on three ripening groups: early, medium and late. Fruit dropping of Robusta coffee depended on the variety groups and highest rate of fruit drop was observed for the early ripening group and lowest for the late one. The fruit drop appeared to concentrate in March and July. ...
SummaryA survey was conducted to evaluate reproductive performance and milk yield of Holstein Friesian cows in Moc Chau dairy breeding company. It was shown that during the period of 2000-2004 dairy production of the Company quickly developed in terms of both cattle population and cattle quality. Reproductive performance was improved as reflected by shortened open days and calving intervals, and ...
SUMMARYA survey was carried out in Hai Duong province to identify the current status and marketing chains of turtle production. Producers and medium collectors were directly interviewed using questionnaires. Results showed that: (i) turtles had been raised since 1991; (ii) there were 146 households raising turtles at the moment with a total area of 4570 m2. On the average, each household had 1,47 ...
SummaryThrips palmi Karny are the most important pests on vegetable crops, it is a serious pests during hot season low rainfall. However, research about this insect pest was scarce. To solve control pest problem and reconize the indigenuos natural enemies of this pest, this research was carried out to survey indigenous natural enemies of Thrips palmi in Gia Lam Hanoi ( Institute for research ...
SummaryA survey was carried out on 33 small-scale pig farms in Truc Ninh district of Nam Dinh province to get better knowledge of the development of this sub-sector. Results showed that the size of pig farms was still modest in terms of land area (773,76 m2) and investment capital (32.500.000 VND). The performance and economic benefits of these farms depended strongly on pork and piglet prices. ...