| 【Objective】The study was conducted to verify the improvement effects of biochar(B)+calcium-magnesium
fertilizer(C) made of soda waste on soil contaminated by heavy-metal Cd.【Method】On the bases of conventional
fertilization(NPK), the treatments of NPK(CK), NPK+20 t/hm2 B, NPK+3 t/hm2 C and NPK+20 t/hm2 B+3 t/hm2 C were made
in the field plot experiment of peanut (Arachis hypogaea L.) and the effects of different treatments on nutrient content and effective Cd content of Cd contaminated soil, and Cd contents of peanut kernel, peanut shell and peanut stem leaf were studied.
【Result】The results show that compared to CK, BC significantly increases the soil pH by 0.91, O.M. by 21.71%, available
Mg by 72.05%, available Si by 39.34%, and decreases available Cd content of soil by 11.63% (P ＜ 0.05). The soil pH had
significantly negative correlation with available Cd content of soil (P ＜ 0.05). The BC can increase the yield of peanut pods by
22.57% and protein content of peanut kernel by 9.39% (P ＜ 0.05). The BC is beneficial to decrease the Cd content of peanut
stem and leaf. 【Conclusion】Biochar+calcium-magnesium fertilizer is a blended material that can be used to improve the soils
contaminated by heavy-metal Cd, and increase the yield and quality of peanut. |
