DUNG TÍCH HẤP THU VÀ MỐI QUAN HỆ VỚI MỘT SỐ TÍNH CHẤT HÓA LÝ HỌC TRONG MỘT SỐ LOẠI ĐẤT Ở MIỀN BẮC VIỆT NAM

Bùi Thị Phương Loan*, Phạm Quang Hà*

*Viện Thổ nhưỡng Nông hoá Quốc gia

Từ khoá: mối quan hệ, dung tích hấp thu, tính chất hoá lý, đất, Bắc Việt Nam

Summary

Cation exchange capacity in some soil types in north of Vietnam and its relationship to some physical and chemical properties

CEC was low in 3 studied soils: sandy soils in Nghe An, medium saline soils in Nam Dinh and feralitic soils on clay shale in Phu Tho provinces. Exchangeable basic cations, indicating CEC quality, were also low and distributed following the order Ca⁺⁺ >> Mg⁺⁺ >> K⁺ > Na⁺. Ii medium saline soils, because of higher concentration of Na⁺ so that K⁺ was replaced by Na+ in above mentioned order. A close relationship between CEC and clay mineralogy was observed, Soils dominant with kaoline have low CEC, where as soils dominant with hydromica, vecmiculite, halloysitehave higher CEC.