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Degradation of N,N'-Dibutylurea (DBU) in Soils Treated with only DBU and DBU-Fortified Benlate Fungicides

Department of Agronomy, Purdue University, West Lafayette, IN 47907-1150

View larger version (27K): [in a new window]   Fig. 1. Representative trends in N,N'-dibutylurea (DBU) degradation experiments for two soils fortified with 0.08 µg DBU g–1 soil incubated at two moisture potentials and at 23°C with fits of the first-order rate law.

View larger version (28K): [in a new window]   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.