Effects of Basic Application of Soil Amendment on Soil Cd Passivation and Rice Cd Accumulation
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.
万方数据
维普
