Inhibiting effects of immobilization agents on cadmium,lead and arsenic in rice production
In the present study,a field experiment was conducted with different application rates(0,2 250,4 500,6 750 kg·hm-2)of commercial immobilization agents to examine their inhibiting effect on soil available cadmium(Cd),lead(Pb),arsenic(As)contents,soil pH value and Cd,Pb,As contents in rice grains for 2 years(2021-2022).It was shown that application of appropriate rate of immobilization agents significantly(P<0.05)increased soil pH value and decreased soil available Cd,Pb,As contents in soil.Among the 6 immobilization a-gents,the best effect in 2021 was noted in the treatment of application of 6 750 kg·hm-2 long-acting passivator,as the soil pH value was significanlty increased from 5.00 to 6.98,the soil available Cd,Pb contents were significantly decreased by 82.2%,98.6%,respectively.Besides,in 2022,application of 4 550 kg·hm-2 long-acting passivator also significantly decreased Cd content in rice grains by 90.8%.In general,the long-acting passivator had the best effect and persistence among all the used immobilization agent,which might be related to its high content of calcium carbonate(CaCO3).
万方数据
维普
