Effect of Atrazine on Soil Invertase Under Different Soil Fertilities

The effects of atrazine under different concentrations on soil invertase in four long- term fertilization soils were studied. There existed significant differences in the effects of atrazine on soil invertase among different fertility soils. Similarly, the activity of soil invertase changed small under CK, NPK as well as NPK+ S in the early treatment, and showed an “ up- down- up” rule during the experiment. The effects were most obvious in the 4th and 16th day after treatment. The soil invertase in NPK+ M was activated evidently on the day of treatment, and afterwards, was inhibited very strongly. According to the treatment time, the activate rate of soil invertase in NPK was the highest, the NPK+ S's was the second and the CK's was the lowest. However, the soil invertase activity of NPK+ M was inhibited mostly. The activate rate of the soil invertase was the biggest among the four soils when the concentration of atrazine was 20 mg· kg- 1 at the same treatment time.