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Field Dissipation of Acetochlor in Two New Zealand Soils at Two Application Rates

^a AgResearch, Hamilton, New Zealand
^b Currently with Environmental & Turf Services, Inc., 11141 Georgia Ave. #208, Wheaton, MD 20902
^c HortResearch, Ruakura Research Centre, Hamilton, New Zealand

View larger version (23K): [in a new window]   Fig. 1. Persistence of acetochlor in Hamilton clay loam soil at an application rate of 2.5 kg a.i. ha–1: Measured and fitted by first-order kinetics (Model 1), quadratic model (Model 2), first-order double-exponential model (Model 3), first-order biphasic model (Model 4), and two-compartment model (Model 5).

View larger version (23K): [in a new window]   Fig. 2. Persistence of acetochlor in Horotiu sandy loam soil at an application rate of 2.5 kg a.i. ha–1: Measured and fitted by first-order kinetics (Model 1), quadratic model (Model 2), first-order double-exponential model (Model 3), first-order biphasic model (Model 4), and two-compartment model (Model 5).

View larger version (27K): [in a new window]   Fig. 3. Measured (mean ± standard deviation) and fitted acetochlor concentrations by first-order kinetics in Horotiu sandy loam soil at (a) 22°C and 40, 60, and 80% of maximum water holding capacity (MWHC) and (b) at 10, 22, and 30°C and 60% of MWHC.