Ngô Ngọc Hưng (trang 52-56) Từ khoá:  ảnh hưởng, bón phân, urea, hoạt động, phiêu sinh thực vật, tảo, N, lúa, đất lúa   Summary Effect of urea application on phytoplankton activity and nitrogen losses in rice field Research was conducted on alluvial soil at Chau Thanh, Can Tho during wet season 2002. Biomass of …

Nguyễn Ninh Phước, Cao Ngọc Điệp (trang 47-51, 61) Từ khoá:  ảnh hưởng, thuốc diệt cỏ, Rafele, Tiller’s, Cantanil, Satunil, hoạt động, sinh khối, vi sinh vật, đất phù sa, lúa, Đồng Tháp   Summary Effect of four kinds of herbicides (Rafele, Tiller’s, Cantanil, Satunil) on rialluvil soils microbial activity and carbon nitrogen biomass in …

Hồ Sỹ Hạnh, Hồ Công Trực, Võ Hành (trang 42-46) Từ khoá:  Oscillatoriaceae, Nostocales, vi khuẩn lam, đất, Đắk Lắk   Summary Oscillatoriaceae (Order family Nostocales) in the cultivated soils of some districts of Dak Lak province Species composition of family Oscillatoriaceae in cultivated soil there is rather diverse. There are 41 species and sub-species …

Võ Thị Gương, Lê Quang TRí, Thái Trường Giang (trang 36-41) Từ khoá:  tính chất, tính chất hoá lý, môi trường đất, môi trường nước, nuôi tôm, lúa, Thới Bình, Cái Nước, Đầm Dơi, Cà Mau   Summary Chemical properties of soil and water in shrimp ponds at Ca Mau province Experiment was in 2002-2003 …

Lê Thị Thuỷ, Phạm Quang Hà (trang 30-35) Từ khoá:  đánh giá, hàm lượng, đồng, kẽm, đất phù sa, sông Hồng, sông Thái Bình   Summary Assessment of Cu, Zn content in fluvisol of Red river and Thai Binh river Analyse results from 24 fluvisols soil samples on total and available Cu, Zn: total Cu …

Nguyễn Văn Toàn (trang 25-29) Từ khoá:  đặc điểm, sử dụng, đất cát, duyên hải Bắc Trung bộ,   Summary Characteristics of coastal arenosol soil and present utilization in Northern central region Extent of coastal arenosols in the region is 206,698 ha. Natural fertility of this soils has an upward tendency in organic matter, total …

Nguyễn Xuân Cự (trang 20-24) Từ khoá:  chuyển hoá, cố định, photpho, đất   Summary Phosphorus fixation and transformation in some soil types of Vietnam Most of studied soils have high P fixation capacity, which is decreasing from ferralit acrisols to xanthic ferrasols, gleyic fluvisols, eutric fluvisols and haplic arenosols. The fraction of Fe-P is …

Nguyễn Hữu Thành (trang 16-19, 24) Từ khoá:  kali, đất phèn, Bắc Việt Nam   Summary The potassium status in acid sulfate soil in the North of Vietnam Acid sulphate soil is high in total potassium, 1.66-2.22%. The quantity of available potassium is not high, 11.07mg/100g soil. Concentration of non-exchangeable is higher, 18.27-39.28 mg/100g soil …

Nguyễn Thúc Huyên (trang 10-15) Từ khoá:  đặc điểm, khoáng học, đất phèn   Summary Mineralogical characteristics and the variability of acid sulfate soils (ASSs) 2 contents of study: main minerals may be indicator to each ASS type and clay minerals in ASSs of Vietnam. Conclusions: pyrite, forming indicator for potential ASSs, are FeS2, microcrystal …

Hồ Quang Đức, Trương Xuân Cường, Ng.T. Hương Giang, Nguyễn Văn Đạo (trang 6-9) Từ khoá:  đặc điểm, khoáng sét, đất đỏ, đá vôi, Bắc Việt Nam   Summary Clay mineral composition of soils derived from limestone in the North of Vietnam 6 typical soil profiles derived from limestone were collected. Caly mineral was analyzed …