摘要
A field experiment of organic manure, passivator and their complex was conducted to study the soil Cd bioavailability in the Cd polluted paddy soil. The results showed that the rice yield increased with the applications of organic manure, passivator and their complex, especially, the rice yields of applying 3 000 and 6 000 kg/hm^2 of organic manure increased significantly by 18.6% （ P 〈0.05） and 20.9% （P 〈0.05） because of the increase of rice economic coefficient. There had no significant change of the soil pH values and the soil available Cd contents, but the Cd distribution ratios in rice were lowered by applying organic manure, and the Cd contents of rice applying 3 000 and 6 005 kg/hm^2 of organic manure dropped by 14.3% （ P 〉 0.05） and 21.4% （ P 〉 0.05） compared with chemical fertilizer treatment, respectively. But applying with passivator and passivator fertilized with 3 000 and 6 000 kg/hm^2 of organic manure, the soil pH values increased and the soil available Cd contents decreased significantly, so that to restrain the rice＇s Cd absorption and accumulation. The rice Cd contents lowered by 28.6% （ P 〈 0.05）, 28.6% （ P 〈 0.05） and 42.9% （ P 〈 0.05）, the stem C,d contents lowered by 8.9% （ P 〉 0.05）, 29.7% （ P 〈 0.05） and 43.6% （ P 〈 0.05）, and the leaf Cd contents decreased by 18.8% （ P 〈 0.05）, 25.0% （ P 〈 0.05） and 25.0% （ P 〈 0.05）, respectively. It enhanced the inactivate effect of passivator significantly when fertilized with organic manure.
A field experiment of organic manure, passivator and their complex was conducted to study the soil Cd bioavailability in the Cd polluted paddy soil. The results showed that the rice yield increased with the applications of organic manure, passivator and their complex, especially, the rice yields of applying 3 000 and 6 000 kg/hm^2 of organic manure increased significantly by 18.6% （ P 〈0.05） and 20.9% （P 〈0.05） because of the increase of rice economic coefficient. There had no significant change of the soil pH values and the soil available Cd contents, but the Cd distribution ratios in rice were lowered by applying organic manure, and the Cd contents of rice applying 3 000 and 6 005 kg/hm^2 of organic manure dropped by 14.3% （ P 〉 0.05） and 21.4% （ P 〉 0.05） compared with chemical fertilizer treatment, respectively. But applying with passivator and passivator fertilized with 3 000 and 6 000 kg/hm^2 of organic manure, the soil pH values increased and the soil available Cd contents decreased significantly, so that to restrain the rice＇s Cd absorption and accumulation. The rice Cd contents lowered by 28.6% （ P 〈 0.05）, 28.6% （ P 〈 0.05） and 42.9% （ P 〈 0.05）, the stem C,d contents lowered by 8.9% （ P 〉 0.05）, 29.7% （ P 〈 0.05） and 43.6% （ P 〈 0.05）, and the leaf Cd contents decreased by 18.8% （ P 〈 0.05）, 25.0% （ P 〈 0.05） and 25.0% （ P 〈 0.05）, respectively. It enhanced the inactivate effect of passivator significantly when fertilized with organic manure.
基金
Supported by National Science and Technology Support Plan Project,China(2012BAD14B17-1)
Key and Special Project of Hunan Province Science and Technology,China(2011FJ1002-3)
