The continuous and incorrect application of herbicides can cause irreparable damage to the environment and life of living beings. Knowledge about the persistence of pesticides in soil is necessary due to the importance of identifying their potential for contamination of the environment and damage to crops. This study was conducted to investigate the effect of manure and biochar on the stability of metribuzin under saturated and unsaturated conditions in a completely randomized design with factorial arrangement. The treatments were two organic amendments (manure and biochar) and moisture condition (saturated and unsaturated) in 7 sampling times (0, 8, 16, 36, 64, 90 and 110 days). The results of measured concentration of herbicide in the treatments from the time of consumption up to 110 days in both saturated and unsaturated states showed that in treatments with organic amendments, reduced concentration of herbicide was higher than control soil. Degradation of herbicide followed first-order kinetics in the soil. A minimum degradation coefficient (k) was observed in control soil and maximum degradation coefficient was observed in biochar treatment that indicates the herbicide stability in control treatment and the positive effect of organic modifiers on increasing the rate of degradation of herbicide. The half-life of treatments was in the range of 34 to 38 days, maximum half-life (38 days) was related to the control soil in unsaturated condition and minimum half-life (34 days) was observed in biochar treatment in saturated moisture. The results of the experiment showed that degradation of herbicide in treatments with organic amendments under saturated moisture was higher than unsaturated condition.
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