DUNG TÍCH HẤP THU (DTHT) VÀ THÀNH PHẦN CATION TRAO ĐỔI Ở ĐẤT BẠC MÀU. CÁC BIỆN PHÁP CẢI THIỆN DTHT VÀ ẢNH HƯỞNG CỦA CHÚNG ĐẾN NĂNG SUẤT LÚA

Hoàng Thị Minh (trang 10-13, 23)

Từ khoá:  dung tích hấp thu, cation trao đổi, đất bạc màu, ảnh hưởng, năng suất, lúa

Summary

Cation exchange capacity and composition of exchangeable cations in degraded soil, means improve cation exchange capacity of soil and influence of cation exchange capacity on rice yield

In degraded soils, CEC is very low in surface layer and increase in deeper layer. They are poor in exchangeable cations special Mg²⁺ and K⁺. On farm mix subsoil with surface soil layer increase CEC of soil. With 50% subsoil and 50% surface soil increase CEC 7.4% compare surface soil. When apply FYM increase CEC of soil from 10-20%. Due to CEC of soil remain nutrients for rice, it has strong correlation with rice yield r=0.78. Organic matters (straw, FYM, azolla) and laterite stone grinded can improve cation exchange capacity of soil. Straw, FYM increase CEC better than azolla.