稻田镉污染VIP+n修复技术模式大面积示范效果

2016年在衡东县三才村进行了稻田镉污染VIP+n修复技术模式标准化大面积示范和对比试验。结果表明:VIP+n技术能降低稻米镉含量,早稻稻米合格率94.0%,晚稻稻米合格率70.0%。比对试验中,VIP+n技术模式效果最显著,早、晚稻米镉含量分别降低0.330、0.191 mg/kg,降低92.4%和72.1%。在大面积示范中,施用生石灰和土壤调理剂降低稻田土壤有效态镉含量不明显,但比对试验中可降低稻田土壤有效态镉含量27.3%,并提高土壤p H值11.0%~12.5.0%。因此,中、轻度镉污染稻田采用VIP+n修复技术,可有效降低稻米镉含量。

Large Area Demonstration Effect of VIP + n Remediation Technology Model for Cadmium Contamination in Paddy Field

A large area demonstration and comparative test of VIP+n remediation technology for cadmium pollution in paddy field was carried out in Hengdong county in 2016.The results showed that VIP+n technology could reduce the cadmium content of rice,the qualified rate of cadmium content in early rice was 94.0%,and that in late rice was 70.0%.In the comparative test,VIP+n technology model was significantly reduced rice cadmium content.The cadmium contents of early and late rice were reduced 0.330 and 0.191 mg/kg,decreased by 92.4% and 72.1% respectively.The application of quicklime and soil conditioner in large area demonstration did not significantly reduce the effective cadmium content of paddy soil,while which decreased effective cadmium content by 27.3% and increased soil p H by 11.0%~12.5% in comparative experiment.The application of VIP+n remediation technology in medium and light cadmium contaminated rice fields can effectively reduce the cadmium content in rice.