4种土壤调理剂对水稻产量及稻米镉吸收的影响

Effect of Four Soil Conditioners on Rice Yield and Grain Cadmium Uptake

该文通过田间小区定位试验,研究了4种不同土壤调理剂施用对2014—2015年度早晚季水稻产量、土壤p H及稻米吸收Cd的影响。结果表明,施加酸性土壤调理剂(T2处理)与矿物源土壤调理剂(T3处理)显著增加了2014—2015年度早晚季水稻的产量,提高了土壤p H。此外,酸性土壤调理剂(T2处理)与矿物源土壤调理剂(T3处理)等两个处理组中稻米Cd含量均显著低于未添加土壤调理剂的对照处理组(p<0.05)。4种土壤调理剂对稻米Cd含量大小为:T2<T3<T1<T4与CK。由此可知,稻田土壤施加不同类型的土壤调理剂对水稻产量、土壤p H及稻米吸收Cd的作用效果差异明显,应首要考虑富含矿物与微量元素的土壤调理剂作为调控技术,进而降低稻田稻米的Cd含量。

A plot experiment in field was conducted to study the effects of four soil conditioners on rice yield and grain cadmium uptake.The results show that addition of acid(T2)and mineral source(T3)of soil conditioner significantly increased the rice yield and soil pH.In addition,the treatment with T2and T3significantly reduced accumulation in rice grain,as compared to the control(CK).The Cd concentration of grain tended to be in the following decreasing order:T2<T3<T1<T4,Ck.Therefore,the findings have implications for understanding Cd accumulation in paddy field receiving different type of soil conditioners and considering acid and mineral source of soil conditioner for reducing Cd level in rice grain produced from Cd-contaminated soils.