The eco-toxicological effect of sulfamonomethoxine on maize rhizosphere and non-rhizosphere soil.

The effects of sulfamonomethoxine(SMM)on soil respiration and activities of urease and catalase in corn rhizosphere and non-rhi-zosphere were investigated by using a rhizobox simulating rhizosphere environment.The study showed that SMM had not significantly effect on the catalase activity during the most incubation period whether it effected by corn root or not.The activity of soil urease was inhibited at the beginning but stimulated afterwards in high dosage concentration of SMM(50 mg.kg-1).The urease activities of rhizosphere soil polluted by SMM were higher than the control,and had a significant rhizosphere effects.Soil respiration was inhibited by SMM both in corn rhizo-spheric and non-rhizospheric soil,the higher of treated concentration of SMM,the stronger inhibition of soil respiration suffered.SMM was less poisonous to soil respiration with the effect of corn rhizospheric.Meantime,the enzyme activities and soil respiration in rhizospheric soil were higher than that of non-rhizosphere all along,the rhizosphere effect was significant.