Fig. 2. Comparative trends in N,N'-dibutylurea (DBU) degradation in the presence and absence of formulation (DF and SP) at –0.03 MPa soil water potential and 23°C for (A) Soil 2AC and (B) Soil 9RD. Application rates of DBU at the low and high concentrations were 0.08 and 0.8 µg g^–1, respectively, and 0.25 to 0.29 µg DBU g^–1 soil for the Benlate formulations.