Hoàng Thị Minh (trang 5-11)
Từ khoá: keo, keo âm, keo dương, đất
Determination quantity of negative and positive colloid on some soil types under different farming systems
The quantity of negative colloid changes from 2.6-22.,6 meq/100mg of soil while the permanent negative colloid changes from 1,6-15,2meq/100g of soil. The quantity of positive colloid changes from 0.6-3.3meq/100g of soil, the highest in ferralitic soils on bazan and lowest in degraded soil. Character of cation and anion sorption is the most important property of soil fertility.