Nowadays, social scientists usually trend to link together varieties of scientific filed in researching.  It?s very important to apply knowledge of interdiscipline such as: Receiving Esthetis to change the method in teaching- learning literature in universities.  To do that, the one who accept Reception Esthetis  has to select with criticism and application creatively.

Thirteen of soybean promising varieties/lines were evaluated  at Cho Moi ? An Giang.  Experiment had designed in Randomized Complete Block Design (RCBD) with three replications.  A plot size was 20 m2 and plant density was 40 x 10 cm.  Fertilizers were applied at the rate of 40N ? 60P ? 30K.  The control cultivar was MTD 176. The results showed that although the weather is drought but all varieties/lines of the experiment were growing very well.  Varieties/lines wereMTD517-8,MTD652-2 andMTD176 adapted with the local conditions with the yields were 2.419, 2.324 and 2.140 kg/ha, and the durations of growing were 82, 85 and 82 days respectively.  Pod borer (Etiella zinckenella) found as the most harmful insect; It decreased grain  yield down  from 23 to 40%. 

The study aims to evaluate the capacity of biogas production from the sap of Water Hyacinth (WH).  The five liters fermentation sets were used to determine the volume of Biogas and methane producing from the sap of WH only and from the sap of WH combined with 5% and 10% pig manure respectively.  Beside the daily gas volume production, the parameters such as: BOD, COD, EC, pH, ?of the input and samples after 5 days, 10 days, 15 days, 20 days of fermentation were determined.  The results showed that the Biogas production from sap of WH only and the sap of WH combined with 5% and 10% pig manure were 0,317 m3 methane/kg COD removed,   0,31 m3 methane/kg COD; 0,317 m3 methanes/kg COD respectively.   The conclusion of this study is WH sap is quite suitable for producing Biogas, the effluent from biogas digester should be gone to further treatment to remove the  remains  organic content.

Tra Vinh has tried to make used of many foreign aids projects accompanied with many domestic projects, such as 135, 120, 35, so on?aiming at carrying out the activities relative to improved rural livelihood issues.  And, the results derived from these activities led to a significant decrease in the rate of poor household, especially for the Khmer poor households.  It is very sure that this gain has a significantly positive contributions from 333 foreign aids projects from 1992-2000.  This study shows that the foreign aids projects are considered as an very important resource for implementing the hunger eradication and poverty reduction strategy of Tra Vinh province, because they contributed about USD 50 million to the poverty reduction activities.With this financial resource, many schools, irrigartion and rural transportation systems were built at communities, especially at poor communities.  The foreign aids projects were also evaluated that they brought to many opportunities for local staffs who participated in implementing the projects in upgrading professional knowledge, and helping them to approach with advanced technologies.  In addition, the foreign aids projects also helped participating staffs change their own operation on management and coordination.  However, to increase benefits resulted from the foreign aids projects, Tra Vinh needs to increase community?s participation much more in steps of project implementing process, and to have a special attention to local personal development, and to improve and reinforce monitoring exercises in process of project management and coordination.

Four treatments were (1) Foliar application of Thiourea (0.5%) in November; (2) Foliar application of Thiourea (0.5%) in August; (3) Paclobutrazol was applied to soil in May and Thiourea (0.5%) was sprayed in August; (4) Paclobutrazol was applied to soil in May and Thiourea (0.5%) was sprayed in November. Paclobutrazol was applied at concentration of 1 g a.i. for 1 m of the canopy diameter. The results showed that, without chemical application for flower induction Chau Hang Vo mango did not flower in off - season. Application of Paclobutrazol to soil in May then spraying Thiourea (0.5%) in August induced flowering 5 times compared with application of Thiourea alone in August. So that the yield of mango of treatment 4 was higher than that of treatment 2 about 7 times. The  yield of mango in off - season was only 57% the yield of on - season.

Studies were made by a rainy season watermelon cultural practice survey in theMekongDelta.  Interviewing by questionairs with 61, 114 and 72 households in Can Tho, Tien Giang and Tra Vinh provinces, respectively.  Results showed that farmers? s practice in Tien Giang were rather good (the highest percentage of households using plastic mulch, hybrid seeds, reasonable fertilizers, pruning, getting income because of good market price), and the worst was in Tra Vinh (the highest percentage of households producing seeds themselves from F1, mulching by ricestraw, no pruning and lowest profit), but the highest fruit yield was in Can Tho.  There were a hundred kinds of pesticide using on watermelon production, with average 8-9 sprays per crop, only 14,2% households applied IPM (Integrated Pest Management).

Two experiments were conducted to evaluate the effect of different feeds and stocking densities on the growth and survival rate of blue swimming crab (Portunus pelagicus). The first experiment concerned with the effects of different feeds on the stages of zoea-1 and 2. Four treatments with four replicates for each were conducted including Chlorella-enriched rotifers, rotifers enriched with ICES (30/4/C) emulsion, rotifers enriched with Frippak (feed for larvae of black tiger shrimp) and umbrella-stage Artemia nauplius.  Rotifers and umbrella-stage Artemia were fed at a density of 10-20 and 5-7 ind/ml, respectively. From zoea-3 to crab-1 stage, all treatments were fed 5-7 instart-1 Artemia/ml. All treatments were stocked 100 zoea-1/l. The second experiment was on the effects of different stocking densities on growth and survival rate. Four treatments with four replicates for each were designed including 100, 200, 300 and 400 zoea-1/l. All treatments were fed umbrella-stage Artemia zoea-1 and 2 (the best result found from the previous experiment) and followed by instart-1 Artemia nauplius. In the first experiment, crablets ( crab-1 stage) were found after 13-14 days of rearing and all larvae reached crab-1 stage within 1-2 days later. The length of zoea-4 raned from 3.24-3.43 mm and megalopa from 2.44-2.69 mm. The carapace width of crab-1 was 2.40-2.45 mm. The average survival rates at crab-1 stage of treatments fed rotifers enriched with Chlorella (8.44±3,77) and umbrella-stage Artemia (10.3±3.78) were not significantly different (p>0.05), but they were higher than those of other treatments. The second experiment proved that the survival rates of larvae at crab-1 stage decreased as the stocking densities increased, but no significant difference (p> 0.05) was found among the tested stocking densities. The highest survival rate was of the 100 zoea-1/l treatment (12.4 %), but the highest number of crab-1 harvested was in  the 300 and 400 zoea-1/l treatments (14.9 and 15.8 crab-1/l, respectively).

With special medium AFPA (Aspergillus flavus and Aspergillus parasiticus Agar), we could  isolated and  count the spores of two  Aspergillus flavus and Aspergillus parasiticus strains  that produces aflatoxin in maize seed.  It was a complete randomise experiment with 3 different humidity and 3 replications.  The result showed that any humidity had both Aspergillus flavus and Aspergillus parasiticus strains without Fusarium strains.  Aflatoxin content was determined by High Performatic Liquid Chromatography.  Maize seed stored at 3, 5, 7,9 and 12 weeks that were 4 kinds of  Bl, B2,Gl, G2 aflatoxins.  In the dry and air condition of seed storage (27,4oC; relative humidity 79,3% and seed moisture content 11,8%) maize seed could be stored within 2 months, total aflatoxin content was lower the aflatoxin allowed in Viet nam.  When the seed moisture content at 13,5% was stored under 72% and 89% relative humidity, the total aflatoxin content were increased highly. 

Study on formulated feed utilization for snakehead (Chana micropeltes) was carried out at fry fish (3 day old) and small fingerling (15 day old) stages.  At the fry stage, the experiment was set up with 8 treatments differed from the time using formulated feed  (4, 5, 6, 7, 8, 9 day old fry) and one control treatment using live food.  After fifteen days, the results showed that  the best  survival and grown rate  of fry fish were achieved for those fed formulated feed at the 7 day (89.1% and 88.9 mg/day, respectively).  For small fingerling, 5  diet treatments were conducted: red worm, trash fish, formulated feed, red worm combined with formulated feed (1:1 ratio) and trash fish combined  with formulated feed (1:1 ratio) treatmenst.  Results after 21-day experiment showed that small fingerling fed formulated feed obtained the best survival rate and specific growth rate (97,5%, 11.5%/day, respectively).  Fish fed combine formulated feed  with red worm or trash fish achieved survival and grown rates better than the single red worm or trash fish diets. 

From the etanol 98% extract of the dried leaves of Phyllanthus niruri.L.(Euphorbiaceae), nirurine, a securineage alkaloid, has been isolated.  The structure of this compound has been elucidated by means of UV, IR, MASS and NMR spectroscopy as well as by comparison with literature.

Five Tet watermelon varieties including 1/ KYV-A; 2/ KYV-C; 3/ KYV-D; 4/ KYV-F and 5/ AN TIEM 95 were compared in the first experiment in randomized complete block design with 3 replications.  The result showed that KYV-C and KYV-D gave  high marketable yields (29.57 and 26,82 t/ha).  Especially, KYV-D was a variety having the best Brix degree (10.6%).  The second experiment was carried out in rainy season with 8 treatments as 8 varieties including: 1/ An Tiem 101, 2/ Hac My Nhan 308, 3/ AG 736, 4/ Thanh My Nhan, 5/ Sieu Nhan, 6/ Hac My Nhan 1430, 7/ AG 757 và 8/ Hac My Nhan Đai Đia.  The result showed that Hac My Nhan 308, Thanh My Nhan, AG 736, Sieu Nhan, Hac My Nhan 1430 gave high yields (15.1 - 17.2 t/ha) and showed a better fruit weight, and thin fruit skin thickness (10.5 - 11.7 mm), Brix degree rather high (11.3 -12%) and had a long shelflife (11 - 12 days).

Ca Tra (Pangasius hypophthalmus Sauvage, 1878) is a traditional culture species for a long time by fish farmers in the Mekong Delta.  The trials on two feed types for Pangasius intensive culture (model I using home-made feed and model II using pellet feed) were carried-out in 4 earthen ponds. The size of 4 ponds ranged from 700 - 2,000 m2/each with the same stocking density of 20 fish/m2.  During 6 months of culture, water physical and chemical parameters in these ponds such as water temperature (28 ? 30.5 °C), transparency (10 - 20 cm), water pH (6.5 ? 7.0), dissolved oxygen (2.6 - 6.0 ppm), N-NH4+ (0.2 - 0.92 ppm) and H2S (0.05 - 0.45 ppm) were in acceptable ranges for Pangasius hypopthalmus culture.  The fish yields of Pond 1 (189 tone/ha) and Pond 2 (195 tone/ha) in model I were lower than those of Pond 3 (212 tone/ha) and Pond 4 (208 tone/ha) in model II.  The cost ratio profit in model I (Pond 1 and Pond 2) were 0.05 and 0.08 respectively and in model II of 0.20 and 0.14 for Pond 3 and  Pond 4, respectively.   

The acquisition and modification of concept and conceptual relationships are the central activities of teaching and learning. Students develop their conceptual frameworks by assimilating and accommodating new knowledge into their existing network of concepts. Students learn meaningfully when they actually assimilate new knowledge by ?connecting?  it to existing knowledge. In many cases, students may hold erroneous ideas (or misconceptions) which contrast with the scientific conceptions. As a result, new concepts may be hard to accept because their assimilation is inhibited. The teacher?s role is to mediate learning by ascertaining student?s existing knowledge and teaching them accordingly. Concept map is promising mean to externalize student?s understanding of  conceptual and their relationships before of learning.

Five mungbean promising varieties were showed in season of Spring ? Summer at Cho Moi?An Giang province to evaluate adapted varieties and to disseminate the mungbean promising varieties.  Experiment was designed in Randomized Complete Block Design (RCBD) with three replications.  The lot size was 20 m2 andplant density was 50 x 15 cm.  Fertilizers was applied at the rate of 40N ? 60P ? 30K.  The controll cultivar is  DX 208.

The study aims to evaluate the growth rate of Water Hyacinth (WH) in wastewater treatment pond and the efficiency of Water Hyacinth in treating wastewater from pig-house and from biogas digester. The experiment was carried out from the January 15th. 2003 to March 15th. 2003 at the Chau Thanh district ? Can Tho province. Two ponds that have the area of 66 m2, 75 m2 respectively were used to treat diluted pig-manure. One 88m2 pond was used to treat effluent from biogas digester. The doubling time of WH in the first two ponds ranges from 12 ? 15 days. The doubling time of WH in the remain pond range from 9.9 ? 13.2 days. In term of biomass the ponds that receive diluted pig-manure can produce 470-488 tons/ha-year, the pond that receives biogas effluent can produce 627 tons/ha-year (wet weight basic). At the low organic loading rate (5.2 ?7.1 kg/ha-year) the output water of WH pond can meet the Vietnamese standard for wastewater.

Termination of employment is an inevitable part of personnel activity within any organization.  Because of its economic and social implications the termination of employment is one of the most sensitive issues in labour law today.  Protection against dismissal is seen by most workers as crucial, since its absence can lead to bad economic consequences in most countries.  Job loses between 1990 and 2004 and the upward trends in unemployment rates have reached alarming proportions in numerous countries.  At present,Vietnamis one of the countries where the percentage of unjustified dismissal is very high.  Studying termination of the individual employment contract is to look for good regulations and improving and strengthening the protection of workers. 

Twelve treatments with 4 main plots (0, 100, 150, 200 kgN.ha-1) and three sub-plots (non-mulching, rice straw and silvery-gray plastic). A split?plot design, 3 replications was conducted to evaluate the effects of mulch material types and N fertilizer levels on the yield and economic aspect of watermelon production in rainy season. There were significant differences on yield, horticultural characters and insect + pest incidence among the treatments. Plastic mulch was most effective in increasing the marketrable fruit yield, net return, total soluble solid and shelf life (10.58 tons.ha-1; 13.42 millions Viet Nam dong.ha-1; 10.92% and 11 days, respectively). The more increasing N (100 to 150 and 200 kg.ha-1) the more reducing marketrable yield (9.27; 9.06 and 7.27 tons.ha-1), net return (12.9 to 1.19 and 6.39 millions Viet Nam dong.ha-1) and shelf life. In combination of plastic mulch and 100 kg N.ha-1 gave the highest total and marketable fruit yields.

Study on the feeding and reproductive biology of spotted cat (Scatophagus argus) was conducted for one-year round from December 2002 to December 2003.  Fish samples were collected monthly in brackish-water bodies of Ngoc Hien district, Ca Mau province.  Collected fishes were measured for weight and length and described for feeding organs (mouth and gill).  Stomach and intestine were reserved in formaline 10%, while gonad was in Bouin solution for later analysis in laboratory.  Some mature females and males were also collected for induced spawning in order to observe embryo development.  The feeding biology and fecundity of fish were studied using method described by Biswas (1993) and Banegal (1967), respectively. The spotted cat had the LGR (length gut ratio) of 2,88 (varying 2,59-2,93), which is considered as  an omnivorous fish.  The stomach and intestine of fish contained 97,8% detritus and 2,25% algae.  The maturation seasons of wild fish was found from April-May and July-August.  The highest GSR (Gonadosomatic ratio) was 16,4% by month and 27.2% by individual.  The minimum size of mature fish was found 40,5g.  The spotted cat had high absolute fecundity of 519,547±237,776 eggs/fish (varying from 215.000?1.073.733 eggs/fish) and relative fecundity was 1.915.579±880.509 eggs/kg of female (varying from 891,505?3,365,934 eggs/kg of female) for the average fish weight of 294±119g/fish.  Of the mature fish population, the female was found bigger than the male.  In addition, the development stages of gonad and embryo were also pictured and described detail in this paper.

A measurement magnetic field may be composed by regional anomalies - corresponding to low frequencies - and by local anomalies - corresponding to high frequencies. The initial step of the magnetic interpretation was the separation of local or  regional anomalies from the measurement magnetic field. The Wavelet transform can be used to decompose a signal into approximation components - corresponding to high scales or low frequencies - and detail components - corresponding to low scales or high frequencies. In this manner, the Wavelet transform can be used to separate the local and regional magnetic anomalies. In this paper we used the Wavelet transform to separate the local - regional magnetic anomalies in one area's offshore ofSouth Viet Nam. The results were compared with the ones calculated by a traditional method.

A study of shrimp by-product preservation by using molasses and enzymes  was carried out at Faculty of Agriculture Cantho University to evaluate the nutrient contents as animal feed  It was a complete randomise experiment with 6 treaments and 3 replications.  The results showed  that the treatment at a ratio of fresh shrimp by-product to molasses (3:1) and supplemented with 0.  1% polymerase was  better  based on color and smell.  In general, the pH of the ensiled product decreased and remained  below 4.  1.  Lactic acid (35,1g/l) and crude protein (32.93%) were the highest increase  after 21 day incubation.  After 15 day incubation, the N-Acetylglucozamin concentration (14.51%) was highest.  It was also  the  important factor  for applying in  production.  In another experimet, ducks were supplemented 17% ensiled shrimp by-product  was the highest daily weight gain.  The conclusion was that molasses and polymerase should be used to preserve the shrimp by product for feeding animals. 

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