Effects of flooding irrigation combined with passivators on Cd uptake and accumulation in rice
A field experiment was conducted in a strictly controlled area of a soil cadmium(Cd)-contaminated paddy field to investigate the effects of flooding irrigation combined with lime and soil passivators on the availability of Cd in soil,Cd uptake,and accumulation in rice.The results showed that flooding irrigation combined with passivators could effectively reduce Cd availability in the soil and Cd uptake and accumulation in rice.The soil pH under the treatment of flooding irrigation combined with lime and soil passivators was increased by 0.97 units relative to the control,while the soil available Cd content,as well as the Cd content in roots,stems and leaves of rice were decreased by 36.4%,63.0%,80.3%,and 42.4%,respectively.The treatment of flooding irrigation combined with lime and soil passivators reduced the content of Cd in brown rice to 0.15 mg·kg-1.Furthermore,the Cd accumulation in brown rice was significantly inhibited by the flooding irrigation combined with the lime and soil passivator treatment.Compared to the control,the Cd bioconcentration factor and total Cd accumulation in brown rice decreased by 67.8%and 62.8%,respectively.Therefore,flooding irrigation combined with passivators was an effective measure to achieve rice safety production in the Cd-contaminated rice fields.
soil Cd contaminationricesafe utilizationflooding irrigationpassivation
万方数据
维普
