Due to the large area of Cd-contaminated paddy soils worldwide, low-cost measures to reduce the accumulation of Cd in rice plant are necessary. A field experiment was therefore conducted to investigate the reducing effect of lime combined with foliar applications of Zn (ZnSO₄) or Fe (EDTA·Na₂Fe) on Cd concentrations in brown rice on a Cd-contaminated paddy soil. The results indicated that liming alone or in combination with foliar sprays of Zn or Fe increased the soil pH by 0.27–0.63 units. However, limited effects of lime or lime combined with foliar applications of Zn/Fe on soil DTPA-extractable Cd, rice grain and rice straw biomass were observed. Liming alone significantly reduced the Cd concentration in brown rice and rice straw by 31.8% and 42.3%, respectively. The Cd concentrations in brown rice decreased by 25.5% and 65.4% and in rice straw by 53.0% and 68.1% after liming combined with foliar applications of Fe and Zn, respectively. In contrast, liming combined with foliar spraying of Fe significantly increased the transfer ratio of Cd from the rice straw to the grain. As a low-cost technique, lime application combined with foliar application of ZnSO₄ could be recommended for the remediation of Cd-contaminated paddy soils.

由于全世界受Cd污染的稻田面积很大，因此有必要采取低成本措施来减少水稻植株中Cd的积累。因此，进行了野外试验，以研究石灰与锌（ZnSO ₄）或铁（EDTA·Na ₂）的叶面施用相结合的还原作用。Fe）对受Cd污染的水稻土中糙米中Cd浓度的影响。结果表明，单独撒石灰或与锌或铁的叶面喷洒相结合，可使土壤pH值提高0.27-0.63个单位。但是，观察到石灰或石灰与叶面施用Zn / Fe结合对土壤DTPA可萃取的Cd，水稻籽粒和稻草生物量的影响有限。单独使用石灰可以使糙米和稻草中的Cd浓度分别显着降低31.8％和42.3％。石灰和叶面喷施铁和锌后，糙米中的镉含量分别下降了25.5％和65.4％，稻草中的镉含量分别下降了53.0％和68.1％。相比之下，石灰与叶面喷施Fe的结合显着提高了Cd从稻草到谷物的转移比率。作为一种低成本的技术，可以建议使用₄来修复Cd污染的水稻土。