Fig. 3. The fraction of dicamba remaining in thatch samples as a function of time. (a) 4°C and 0.21 water content, (b) 4°C and 0.28 water content, (c) 20°C and 0.21 water content, and (d) 20°C and 0.28 water content. The solid line indicates the curve described by Eq. [1].