复合钝化材料对Cd污染耕地水稻影响的研究

Study on the effect of compound passivation material on Cd-polluted cultivated rice

以高岭土、赤泥为主要原材料制备复合钝化材料,针对湖南中南部典型Cd污染耕地进行田间实验,通过不同添加量复合钝化材料考察其对水稻产量、稻米镉含量的影响。结果表明,添加复合钝化材料可以不同程度的增加稻谷产量,但差异性不显著;添加复合钝化材料使水稻糙米镉含量明显下降,当添加量为600、800、1000kg/667m^(2)时,糙米镉含量显著下降,分别下降85.12%,80.95%,78.42%。

The composite passivation material was prepared with kaolin and red mud as the main raw materials. Field experiments were conducted on the typical Cd-contaminated farmland in central and southern Hunan. The effects of the composite passivation material on rice yield and rice cadmium content were investigated through different addition amounts of composite passivation materials. The results show that the addition of composite passivation materials can increase rice yield to varying degrees, but the difference is not significant;the addition of composite passivation materials significantly reduces the cadmium content in rice brown rice, when the addition amount is 600, 800, and 1 000 kg/667 m^(2), the cadmium content of brown rice dropped significantly, dropping by 85.12%, 80.95%, and 78.42% respectively.