不同叶面肥对轻度重金属污染稻田水稻重金属积累调控效果研究

Controlling Effects of Different Foliar Fertilizers on Heavy Metal Accumulation in Rice Plant in Mild Heavy Metal Polluted Paddy Field

评价了喷施3种叶面肥对轻度重金属污染稻田中重金属积累和去向的调控效果,结果表明:喷施腐植酸肥、富硒肥、自配钛硒微肥处理比清水对照处理稻谷中铅含量分别降低10.49%、16.05%和27.78%,平均降低18.11%;稻谷中镉含量分别降低22.00%、34.00%和52.00%,平均降低37.00%;稻谷中汞含量分别降低38.20%、47.19%和51.69%,平均降低45.69%;稻谷中铬含量分别降低4.30%、20.92%和29.51%,平均降低18.24%。喷施腐植酸肥、富硒肥处理分别比清水对照处理稻谷中砷含量降低21.11%和12.22%;喷施3种叶面肥均能显降低稻谷重金属综合污染程度;喷施腐植酸肥、富硒肥、自配钛硒微肥分别比喷清水对照增产稻谷33.4、43.2和49.8 kg/667m2,增幅分别为7.82%、10.11%和11.66%,均达到差异显著水平。

The controlling effects of spraying three kinds of foliar fertilizer on heavy metal accumulation in rice in mild heavy metal polluted paddy field were evaluated.The results showed that in comparison with treatment of fresh water（control）,with treatment of humic acid fertilizer,selenium fertilizer and titanium-selenium fertilizer,Pb content in rice grain decreased by 10.49%,16.05% and 27.78%,respectively,average decreased by 18.11%;Cd content decreased by 22.00%,34.00% and 52.00%,respectively,average decreased by 37.00%;Hg content decreased 38.20%,47.19% and 51.69%,respectively,average decreased by 45.69%;Cr content decreased by 4.30%,20.92% and 29.51%,respectively,average decreased by 18.24%.In comparison with control,As content in rice grain treated with humic acid fertilizer and selenium fertilizer decreased by 21.11% and 12.22%,respectively.Therefore,spraying three kinds of foliar fertilizer can significantly reduced comprehensive heavy metals pollution.In comparison with control,the yield of rice treated with humic acid fertilizer,selenium fertilizer and titanium-selenium fertilizer increased by 501 kg/hm2,648 kg/hm2 and 747 kg/hm2,respectively,and their increasing amplitudes were 7.82%,10.11% and 11.66%,respectively,which all reached significant level.