Cadmium Reduction Effect of Lepukang Soil Conditioner on Medium Rice Soil and Rice
In order to explore the cadmium(Cd)reduction effect of Lepukang soil conditioner(powder)on medium rice soil and rice,a continuous three-year field experiment was conducted.On the basis of conventional fertilization,1 500 kg/hm2(T1)and 750 kg/hm2(T2)of Lepukang soil conditioner(powder)were applied,and zero conditioner(CK)was set,so as to study the difference in soil pH value,rice yield,soil Cd content,and rice Cd content.The results indicate that in terms of soil pH value,in comparison with CK(5.3),T1 is increased by 1.5(P<0.01),and T2 is increased by 0.9(P<0.05).In terms of effective spikes of rice,in comparison with CK(2.485 million spikes/hm2),T1 is increased by 6.8%(P<0.05),and T2 is increased by 2.6%.In terms of number of grains per spike,in comparison with CK(119.0),T1 is increased by 8.1%(P<0.05),and T2 is increased by 1.1%.In terms of yield,in comparison with CK(6 433 kg/hm2),T1 is increased by 15.54%(P<0.01),and the net income of T1 is increased by 1 400 yuan/hm2.In comparison with soil Cd content in CK(0.425 mg/kg),T1 is decreased by 33.88%(P<0.01),and T2 is decreased by 29.88%(P<0.01).In comparison with rice Cd content in CK(0.266 mg/kg),T1 is decreased by 47.74%(P<0.01),and T2 is decreased by 38.35%(P<0.01).Therefore,the recommended amount of Lepukang soil conditioner(powder)is 1 500 kg/hm2.
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