在湖南省衡阳县某重度Cd污染的农田上种植早稻品种株两优819,开展石灰、基施硅肥、叶面锌肥、叶面硅肥和自配阻控剂等5种材料降低水稻镉含量的效果研究。结果表明,5种阻控剂对株高的影响不显著(p>0.05),但对产量的影响均达显著水平(p<0.05);与对照相比,5种阻控剂均能降低糙米中Cd的含量,其中叶面锌肥的降Cd效果最明显,降Cd效率为46.43%,其次为自配阻控剂和基施硅肥,降Cd效率分别为39.29%和39.28%,均达到国家粮食安全标准值。
关键词:
水稻; 镉; 阻控剂; 土壤; 重度污染区
The effects of lime, silicon fertilizer, silicon foliar fertilizer, zinc foliar fertilizer and mixed fertilizer (our own product) on reducing Cd contents in brown rice were studied, using Zhuliangyou 819 as material which was planted in serious Cd-contaminated field. The results showed that compared with the control, there was no significant effects on the heights of rice with the five inhibitors treatment, but the yield significantly increased, especially with the mixed fertilizer treatment, which increased rice yield by 24.25%. Compared with the control, the five inhibitors all had the effects of reducing the Cd contents in brown rice, the effects of the zinc foliar fertilizer treatment was the best, the Cd contents in brown rice was decreased by 46.43%, followed by the mixed fertilizer and silicon foliar fertilizer treatment. The Cd contents in brown rice was lower than the value of the national standard after dealing with zinc foliar fertilizer, mixed fertilizer and silicon foliar fertilizer.
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