摘要
To investigate the effects of Tianshifu soil conditioners on rice growth and their control effects on Cd absorption and accumulation in rice, a test was carded out in the field typically polluted by Cd in Hunan Province. The results showed that the Tianshifu soil conditioner, soil bacterial conditioner and the combination of Tian- shifu soil conditioner and soil bacterial conditioner all could promote rice growth, im- prove rice yield and reduce significantly Cd content in rice grains. In Beishan, the Cd contents in rice grains treated by Tianshifu soil conditioner, soil bacterial condi- tioner and the combination of Tianshifu soil conditioner and soil bacterial conditioner were reduced by 37.63% （P〈0.05）, 32.59% （P〈0.05） and 27.95% （P〈0.05） respec- tively compared with that in rice grains treated by conventional fertilization; In Xiang- tan, the Cd contents in rice grains were reduced by 54.36% （P〈0.05）, 50.19% （P〈 0.05） and 45.22% （P〈0.05） respectively. The rice grains harvested at the two test sites all met the national food safety standards. Considering the control effect on Cd contamination, Tianshifu soil conditioner 〉 combination of Tianshifu soil condi- tioner and soil bacterial conditioner 〉 Tianshifu soil bacterial conditioner. In addition to reducing Cd absorption in rice, as described in the lime application treatment, the application of Tianshifu soil conditioners also inhibited the transportation of Cd from rice straws to rice grains. The Tianshifu soil conditioner, soil bacterial conditioner and combination of Tianshifu soil conditioner and soil bacterial conditioner also effec- tively improved the soil acidity, increased the soil pH value and reduced soil avail- able Cd content to some extent.
采取湖南典型Cd污染的大田试验,研究"田师傅"系列土壤调理剂对水稻生长的影响及降低水稻吸收积累Cd的效果。结果表明,"田师傅"土壤调理剂、土壤调理菌剂及两者混施皆可促进水稻生长,提高水稻产量,并显著降低稻米Cd含量。北山点"田师傅"土壤调理剂、土壤调理菌剂及两者混施的稻米Cd含量分别比常规施肥下降37.63%(P<0.05)、32.59%(P<0.05)、27.95%(P<0.05);湘潭点则分别下降54.36%(P<0.05)、50.19%(P<0.05)、45.22%(P<0.05),皆达到食品安全国家标准,且"田师傅"系列调理剂的降Cd效果为土壤调理剂>土壤调理剂与土壤调理菌剂两者混施>土壤调理菌剂;与施用石灰降低水稻对Cd的吸收相比,施用"田师傅"系列土壤调理剂还抑制了稻草中的Cd向稻米中转运;"田师傅"土壤调理剂、土壤调理菌剂及两者混施皆可有效改良土壤酸性,提高土壤p H,并在一定程度上降低土壤有效态Cd含量。
