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27 Application of FAO - UNESCO - WRB method for soils survey and classification in Ha Nam province
27 Application of FAO - UNESCO - WRB soil classification system for soil map compilation at medium and large scales (A case study in Nghia Dan district, Nghe An province)
Applying the FAO-UNESCO-WRB soil classification system (FAO.88, 91 and WRB.98), the soil map of Nghia Dan district, Nghe An province has been compiled at the scale 1/25.000. The lower levels (lower soil subunit) for legend of soil map are recommended. The legend of soil map included 6 major soil groupings, 16 soil units, 23 soil subunits, and 24 lower levels. Each mapping unit is expressed on the soil map.
27 Application of SPOT Quicklook satellite images to identify and delineate the changing of Melaleuca specialized- use forest in Vo Doi natural reserve, Ca Mau province
27 Application of Vegetation Temperature Condition Index for assessing desertification of coastal areas in Vietnam
A desertification mapping approach is developed using MODIS, ASTER and ENVISAT ASAR products. Vegetation density and thermal properties were extracted from MODIS and ASTER data while soil moisture was estimated from ENVISAT ASAR. The relationship between vegetation density, soil moisture, and surface temperature, and the role of these parameters in the desertification process are under investigation.
27 Assessment of soil erosion rates and the effectiveness of soil conservation measures using fallout radio-nuclides and plots
27 Assessment of soil nutrition status in Tu Ky district, Hai Duong province using chemical analysis and biological indicators
To assess the status of soil nutrition in Tu Ky district, Hai Duong province, principal chemical properties and P, K and Mg concentration of 18 soil samples have been analyzed. Beside that, the presence of plant in the study site was investigated. The research results showed that the concentrations of available P and K were low, while the concentration of highly dynamic Fe was very high. The same result was obtained when using biological marker, however, concentration of Mg in the soil samples analyzed by biological indicator was lower compare to that analyzed by chemical method.
27 Carrying migration (Matter transportation process), siallitisation and siallite accumulation process
27 Change of fertility in basaltic soils through cultivation process in some regions in Dac Lac province
The results of research on the change of fertility in the basaltic soils in Dac Lac province under different land use type such as coffee, rubber, annual crop and forest (natural forest, planted forest) showed that: in general, the fertility of basaltic soil reduced through the cultivation process (chemical and physical properties), especially on soils of low fertilizer application or non-fertilizer. The results also indicated that soil fertility under coffee plantation is better than that of rubber and annual crop cultivation.
27 Change of some soils chemical and biological properties by application of green manure residues and sugar filter cake compost
27 Characteristics of coastal sandy soils in Thua Thien Hue province
27 Concentration of toxic metals (Al, As, Cd, Cu, Fe, Mn, Ni, Pb, Zn) in canals in severe, moderate and potential acid sulphate soils in Long Xuyen Quadrangle, Mekong River Delta
27 Effect of fertilizer rates and transplanting density to nutrient uptake and yield of CH5 drought resistant rice variety and LC-931 upland rice variety sown on rainfed area in Yen Binh district, Yen Bai province
On rain area in Yen Binh district, Yen Bai province, the replacement of the pure or Chinese cross-bred variety by the two drought resistant variety (CH 5 and LC-931), can economize the irrigation cost, hence increase the income of the people up to 13% with LC-931 variety and 30% with CH 5 variety. In condition of water limit, LC-931 variety has more economic effect than CH 5 variety (14% more in interest). If water is sufficient for transplanting rice seeds (in trays), CH 5 variety gets 16% more in productivity and 14% more in interest than LC-931 variety. In both cases of sowing and transplanting, the density of 40 hill/m2 and the ratio of 60N + 60 P2O5 + 60 K2O are suitable for the area.
27 Effect of some active microorganism products on rice in Thai Nguyen province
27 Effect of some microorganism products on yields and NO3 concentration of Brassica juncea plant and soil properties in Thai Nguyen province
The results from using some microorganism products for the vegetable in Thai Nguyen Province indicated that: application of microorganism products as Biogro multi-effect organic and microorganism (Biogro), Multi-effect organic and microorganism (DTD) and Song Gianh organic and microorganism products (Song Gianh) with 550 kg/ha increased the vegetable yield by 39%-46%. Using 550 kg of Biogro, DTD, or Song Gianh could reduce 25-50% mineral fertilizer amount as common recommendation but the yields obtained were similar and NO3 concentration of harvested product reduced nearly to the safety level of NO3 as regulated by Vietnamese Standard. Application of the three microorganism products resulted in higher economic efficiency and better soil chemical properties than using mineral fertilizers alone.
27 Effects of combination levels of nitrogen and phosphate fertilizers to the growth and yield of winter potato on degraded gray soils in Bac Giang province
The research was carried out in winter crop of 2005-2006 in Hiep Hoa and Viet Yen districts, Bac Giang province. Four combination levels of nitrogen and phosphate fertilizers were treated. The results showed that: - At the level of 45 kg N/ha + 60 kg P2O5/ha the growth stage of potato lasts longer, and higher yield was obtained. - All of the combination levels with nitrogen and phosphate gave strong effect at 45 days after growing. The balanced development showed at the combination level of 60kg N + 60kg P2O5/ha. - Application level of 60kg P2O5/ha has decreased potato disease despite of high application level of nitrogen. - Potato yield in 5th treatment (60kg N + 60kg P2O5/ha) is 12.6 kg/ha higher than in 1st treatment (30kg N + 0 kg P2O5/ha).
27 Effects of wastes from trade villages on cadmium (Cd) and zinc (Zn) concentration in paddy soil and rice in the Red River Delta
27 Evaluating the efficiencies of the land use change on acid sulphate soils by using the RESTORE software - A case study in Vinh Loc village, Hong Dan district, Bac Lieu province
27 Evaluation of biomass and effect of submergence depth on Melaleuca growth on peat soils and acid sulphate soils in U Minh Ha, Ca Mau province
27 Inquiry and assessment the utilization of surface water resources in Kon Tum province of Central Highlands
27 Investigation of soil physical, chemical and biological properties of intensive vegetable cropping at Than Cuu Nghia commune, Chau Thanh district, Tien Giang province
27 Main characteristics of soil micro-morphology some soil types in the North Vietnam
27 Modelling to predict CH4 and N02 emission from cropping systems in Northern Vietnam
27 Relationship between diagnostic horizons, diagnostic characteristics of intensified rice soils in the Mekong Delta and the fertility capability classification system characteristics
27 Soil characteristics and land use capability in Thongmyxay district, Sayaboury province, Laos PDR
27 Soil classification after FAO - UNESCO quantitative approaches for Ha Lang district, Cao Bang province
Leaching and accumulation are two adverse dominant soil-forming processes in Ha Lang district, Cao Bang province. Under the impact of soil-forming factors the seven major soil groups, nineteen soil units and seventy-five soil subunits are distinguished in studied area. In which four major soil groups (fluvisoils, calcisols, phaeozems and ferralsols) are fertile and favorable for agricultural production. The improvement and conservation of Acrisols, Leptosols, and Gleysols are paid much attention. Prevention of soil leaching, soil erosion, soil imbalanced nutrients and drought hazard is urgent need in this area. Based on studied results, the main policies and measures for environmentally sound land use in Ha Lang district have been proposed.
27 Soil properties and land use capability of saline soils and acid sulphate soils in Tien Giang province
27 The effects of long-term application of N for cassava on crop response in sloping land in Thai Nguyen province
The long-term effects of N application for cassava production in sloping land in Thai Nguyen province were evaluated. Long-term N addition significantly increased cassava yield throughout the course of the experiment. Higher yields of cassava on N-fertilized treatments in latter years of the experiment reflect the depletion of soil N in the control treatment. However, in all treatments cassava yields that tended to decrease over years regardless of N application suggest that the long-term N application may deplete other nutrient reservoirs. In the long-term, Mg may become the yield limiting factor where nitrogen is applied annually at a high annual rate without Mg. The 80 kg N/ha rate in combination with 40 kg P2O5, 80 kg K2O/ha and 10 to 40 kg Mg as dolomitic lime or magnesium oxide is recommended for cassava production.
27 The water quality of the Red River, Nhue River and To Lich River: physico-chemical variables, nutrients and organic pollution
The water quality of the Red River, the Nhue River and the To Lich River was investigated by monthly campaigns during two years of 2002 and 2003. Beside nutrients (nitrogen, phosphorus and silica), other informative variables (conductivity, dissolved oxygen, suspended solids, chlorophyll a, etc.) and total dissolved organic carbon will help to better characterize the water quality of these rivers. In term of nutrient and organic pollution, the Red River was classified between the oligotrophic and mesotrophic level while the To Lich River was in the eutrophic one. The Nhue River toward its downstream, due to the impact of the water quality of the To Lich River, has been arriving to the eutrophic pollution.
27 Uptake potential of cadmium, lead and chromium from soil by Vetiver grass
27 Use of polyacrylamide (PAM) for erosion control on sloping soils in Ha Tay province
On sloping soils, polyacrylamide (PAM) application decreased soil erosion and increased crop yields. Use of PAM on land cultivated cassava with 5 -7 kg/ha rate has lowed down 70 - 83% soil lost and that of 76.1 - 77.5% on cultivated tea land with 4 - 6kg/ha of PAM use rate. Soil aggregate has increased with PAM, also for particle size> 1 mm, soil thereby resists erosion better. With rate of 5kg PAM/ha particle size >1mm increased 30% compared to control and double with rate of 7kg PAM/ha. In comparison with control, on tapioca land cultivated cassava, PAM formulation benefits 2.2 to 2.8 million VND and 1.2 to 1.8 million VND per ha on tea land.
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