**2. Biochar influence on herbicide sorption to soil**

This study examined atrazine and 2,4-D sorption to several biochars that were the result of microwave pyrolysis using varying temperatures and processing times of maize and switchgrass biomass. In addition, sorption characteristics of these two chemicals to soil amended with these biochars at two application rates were determined.

#### **2.1 Materials and methods**
