To study the effect of the application of soil amendment on the Cd availability in soil and the Cd content in brown rice,a continuous three-year field experiment was conducted in two different textures of Cd contaminated paddy soil in Xiaojia Town,Hengyang City,Hunan Province. The results indicated that:(1) continuous application of soil amendment (2250 kg/hm2 and 3000 kg/hm2) for three years significantly increased the paddy soil pH in Jinxing Village and Niuling Village,and reduced the content of available Cd in soil by 14.1％-50.0％and 16.9％-49.4％,respectively;(2) continuous application of soil amendment for three years significantly increased the rice yield in Jinxing Village and Niuling Village,and reduced the Cd content in brown rice by 40.4％-62.9％ and 40.0％-64.1％,respectively. Moreover,the Cd content in brown rice in both areas was 0.15-0.18 mg/kg under the treatment of applying 3000 kg/hm2 amendment,lower than the National Standards for Food Safety (GB2762—2022);(3) the net income of farmers in both areas increased significantly by 1603-2912 and 2282-3408 yuan/hm2,respectively,under the treatment of applying 3000 kg/hm2 amendment. Therefore,the application of soil amendment was a remediation technology that can achieve safe production in mildly Cd contaminated paddy soil.
维普
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