NGHIÊN CỨU ẢNH HƯỞNG CỦA BÓN THAN SINH HỌC ĐẾN TÍCH LŨY MỘT SỐ KIM LOẠI NẶNG TRONG RAU MUỐNG TRỒNG TRÊN ĐẤT XÁM BẠC MÀU

This study investigated the accumulation of Cu, Pb and Zn in the water morning glory () under the effects of biochar on haplic acrisols. Biochar was mixed with acrisols with four different rates (0%, 1%; 5%; 10%; w/w). Results showed that, pHH2O of soil increased from 5.2 to 9.2, pHKCl from 4.2 to 8.3, CEC increased from 9.24 to 17.5 cmolc/kg, water holding capacity increased from 36.6 to 49.2% as comparing to the control pots. The biochar amending in soil probably caused immobility of Cu, Pb and Zn as the resulted reducing the uptake capacity of those metals by the plant. The accumulations of Cu, Pb, and Zn on the plants were decreased by 37.3-51.7%, 39.1-85.8%, and 13.8-36.1%, respectively, comparing to the control (0% biochar). Biochar improved soil fertility as well as enhancing the heavy metals immobility in the acrisols but with the amount of 10% bichar added into the experimented haplic acrisols, water morning glogy was not able to grow.