施用乐圃康土壤调理剂对中稻土壤和稻米的降镉效果

Cadmium Reduction Effect of Lepukang Soil Conditioner on Medium Rice Soil and Rice

为探索乐圃康土壤调理剂(粉剂)对中稻土壤和稻米的降镉(Cd)作用,连续进行了3 a田间试验。试验在常规施肥基础上设乐圃康土壤调理剂(粉剂)1500kg/hm^(2)(T1)、750kg/hm^(2)(T2)和不施调理剂(CK),研究土壤pH值、稻谷产量、土壤Cd和稻米Cd含量与CK的差异。结果表明:土壤pH值方面,与CK(5.3)相比T1提高了1.5(P<0.01),T2提高了0.9(P<0.05);水稻有效穗方面,与CK(248.5万穗/hm^(2))相比T1提高了6.8%(P<0.05),T2提高了2.6%;每穗粒数方面,与CK(119.0粒)相比,T1提高了8.1%(P<0.05),T2提高了1.1%;产量方面,与CK(6433 kg/hm^(2))相比,T1增产15.54%(P<0.01),纯收入增加1400元/hm^(2);与CK的土壤Cd含量(0.425mg/kg)相比,T1降低33.88%(P<0.01),T2降低29.88%(P<0.01);与CK的稻米Cd含量(0.266mg/kg)相比,T1降低47.74%(P<0.01),T2降低38.35%(P<0.01)。因此,乐圃康土壤调理剂(粉剂)推荐用量为1500kg/hm^(2)。

In order to explore the cadmium(Cd)reduction effect of Lepukang soil conditioner(powder)on medium rice soil and rice,22 a continuous three-year field experiment was conducted.On the basis of conventional fertilization,1500 kg/hm^(2)(T1)and 750 kg/hm^(2)(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/hm^(2)),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(6433 kg/hm^(2)),T1 is increased by 15.54%(P<0.01),and the net income of T1 is increased by 1400 yuan/hm^(2).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 1500 kg/hm^(2).