Field experiments were carried out to investigate the effects of composite passivator Sl(activated carbon nanoparticle and silicon-potassium-calcium-magnesium fertilizer), S2 (volcanic rock and calcium-magnesia phosphate fertilizer), and their compound treatments with silicon fertilizer F;on lead (Pb) remediation in paddy soil and Pb accumulation, in the Gejiu mining area of Yunnan Province (PRC).The results showed that application of soil regulator increased the yield of rice, and that soil regulator supplemented with silicon fertilizer treatments appeared more effective than did single treatments for increasing the yield of rice.After a period of rice growth, different treatments increased soil pH values, and reduced the soil acid extractable fraction of Pb.After application of S2 + F, compared with the control group, the rice yield increased by 29.7％, soil pH values increased by 0.48, the soil acid extractable fraction of Pb decreased by 45.5％, and the Pb content of brown rice decreased by 80.4％:A concentration lower than the maximum levels permitted by the Chinese standard for Pb in foods (GB2762-2012).In conclusion, composite passivator S2 combined with silicon fertilizer not only decreased the available Pb in contaminated soil, but also obviously reduced the Pb content in rice, thereby improving the food safety of rice.This compound treatment could provide effective regulation of Pb in the polluted farmland in the Gejiu mining area.
国家科技期刊平台
NSTL
维普
万方数据
