Soil cadmium (Cd) was easy to accumulate in rice and threat to human health. The effects of chemical amendments on Cd absorption characteristic in rice under the rice straw returning was worthy of attention. The cadmium (Cd) contaminated paddy field was selected as the experiment plots in Jingyang, Deyang city, Chengdu Plain. The effects of three chemical amendments (lime, calcium-magnesia phosphate fertilizer and sepiolite) on the rice growth, Cd uptake and accumulation in rice were studied under the straw (rape and wheat) returning directly in the plot experiment. The results showed, compare with the conventional treatment, the calcium-magnesia phosphate fertilizer addition based on the rape straw returning and the sepiolite addition based on the wheat straw returning, which could promote the rice height, tiller number and rice yield, increased the rice yield for 6.34% and 12.64%respectively, the promoting effects were significant (P<0.05). The chemical amendments (lime, calcium-magnesia phosphate fertilizer and sepiolite) addition based on the straw returning reduced the content of Cd in brown rice effectively, reduced the ratio of 21.65%~36.75%(rape straw returned), and 21.11%~33.87%(wheat straw returned) respectively (P<0.05). All the amendments (lime, calcium-magnesia phosphate fertilizer and sepiolite) treatments based on the rape straw returning, which promoted the Cd accumulation in rice stem and leaf, increased for 1.31~2.41 times compared to the conventional treatment (P<0.05). This may be have an adverse impact on the rice aboveground (stem and leaf) recycling in paddy field directly. The lime or sepiolite addition based on the wheat straw returning reduced the accumulation of cadmium in the stalks, chaff, and brown rice significantly, which reduced the ratio of 6.28%~19.63% and 70.16%~78.68% respectively compared with the conventional treatment(P<0.05). Comprehensive the rice yield and Cd absorption in rice, the chemical amendments (lime, calcium-magnesia phosphate fertilizer and sepiolite) addition based on the rape straw returning and the sepiolite addition based on the wheat straw returning were the ideal cooperation treatment of straw returning and chemical amendments.
国家科技期刊平台
NSTL
维普
万方数据
