Control Effects of Tianshifu Soil Conditioners on Cd Contamination in Paddy Fields of Hunan Province.

To investigate the effects of Tianshifu soil conditioners on rice growth and their control effects on Cd absorption and accumulation in rice, a test was carried out in the field typically polluted by Cd in Hunan Province. The results showed that the Tianshifu soil conditioner, soil bacterial conditioner and the combination of Tianshifu soil conditioner and soil bacterial conditioner all could promote rice growth, improve rice yield and reduce significantly Cd content in rice grains. In Beishan, the Cd contents in rice grains treated by Tianshifu soil conditioner, soil bacterial conditioner and the combination of Tianshifu soil conditioner and soil bacterial conditioner were reduced by 37.63% (P<0.05), 32.59% (P<0.05) and 27.95% (P<0.05) respectively compared with that in rice grains treated by conventional fertilization; In Xiangtan, the Cd contents in rice grains were reduced by 54.36% (P<0.05), 50.19% (P< 0.05) and 45.22% (P<0.05) respectively. The rice grains harvested at the two test sites all met the national food safety standards. Considering the control effect on Cd contamination, Tianshifu soil conditioner > combination of Tianshifu soil conditioner and soil bacterial conditioner > Tianshifu soil bacterial conditioner. In addition to reducing Cd absorption in rice, as described in the lime application treatment, the application of Tianshifu soil conditioners also inhibited the transportation of Cd from rice straws to rice grains. The Tianshifu soil conditioner, soil bacterial conditioner and combination of Tianshifu soil conditioner and soil bacterial conditioner also effectively improved the soil acidity, increased the soil pH value and reduced soil available Cd content to some extent. [ABSTRACT FROM AUTHOR]