矿物钝化剂对土壤及稻米镉含量的影响

Effect of Mineral Passivator on Cadmium Content in Soil and Rice

为了研究不同复合矿物钝化剂对土壤pH、有效态Cd含量的影响,探讨钝化剂对水稻糙米降镉效果以及对产量的影响,文章采用田间小区试验,选用三种钝化剂,以225 g/m2施用量进行试验。试验结果表明:与空白对照相比,三种钝化剂均可使土壤pH升高,有效态Cd含量降低,且水稻糙米中镉含量亦有不同程度的下降,其中钝化剂M(麦饭石+熟石灰)的降镉效果最好,对水稻也有一定的增产作用。可考虑在重金属污染农田修复中实际运用。

In order to study the effects of different compound mineral passivators on soil p H and available Cd content,to discuss the effects of passivators on output and cadmium reduction of rice,three passivator sampls were selected in this paper. The experiment was carried out with the dosage of 225 g/m2 and held in filed. The results showed that compared with the blank control,the three passivators could increase the soil p H,decrease the available Cd content,and decrease the cadmium content in rice to some extent. Among them,the passivator M（ medicinal stones plus slaked lime） had the best effect on cadmium reduction,and also had a certain effect on increasing the output of rice. It can be considered to be applied in the remediation of heavy metal contaminated farmland.