Effects of Different Soil Amendments on Cadmium Uptake by Maize

Abstract

选取秸秆有机肥、钠基膨润土和腐植酸铵三种土壤修复剂进行试验研究，评价对玉米各部分镉含量、增产效果和土壤有效态镉的影响。结果表明：三种不同的土壤修复剂均能提高土壤的碱性值；三种处理组分别增产了6.4%、1.9和4.5%，其中秸秆有机肥组达到了极显著水平(P Straw organic fertilizer, sodium bentonite and ammonium humate were selected to evaluate the effects about cadmium content, yield increase and soil available cadmium in maize. The results showed that three different soil amendments could increase the alkaline value of soil, increased by 6.4%, 1.9% and 4.5% respectively, and the straw organic fertilizer group reached a very significant level (P < 0.01). Ammonium humate group reached a significant level (P < 0.05). The content of cadmium in maize in the three treatment groups decreased by 16.7%, 33.3% and 20.8%, re-spectively, of which the sodium bentonite group decreased significantly (P < 0.01), followed by the ammonium humate group (P < 0.05). The cadmium content in maize stems and leaves in the three treatment groups decreased by 5.2%, 13.8% and 8.6%, respectively, and the sodium bentonite group decreased significantly (P < 0.05). After maize harvest, the content of available cadmium in the three treatment groups decreased by 19.9%, 44.8% and 26.5%, respectively, and the sodium bentonite group decreased significantly (P < 0.01). The ammonium humate group decreased sig-nificantly (P < 0.05). The study on the coexistence of selenium and cadmium found that three dif-ferent soil amendments all had a certain effect of promoting selenium and inhibiting cadmium absorption. The results show that three different soil amendments can be used as potential soil amendments to a certain extent in enriching selenium and reducing cadmium in maize, and pro-vide technical support for farmland soil remediation.