Degradation of the herbicides molecules in soil under different temperatures

The objective of this work was to evaluate the effect of different temperatures on the degradation of ametryn, hexazinone and diuron molecules in a typical Dystroferric Red Latosol incubated at 25, 35, 40 and 45°C, with soil moisture of5 70% of field capacity. Diuron and hexazinone herbicides were more persistent under warmer temperature conditions (25°C). On the other hand, ametryn showed higher persistence in the soil at higher temperature (45°C) conditions. The half-life values for the three herbicides at different temperatures ranged from 24 to 77 days for ametryn, 30 to 77 days for hexazinone and 32 to 99 days for diuron.