Fig. 6. Soil type effects on concentration–time exposure index (CTEI) (a) mean, (b) standard deviation or SD, and (c) coefficient of variance or CV of the top-100-cm profile calculated from 1000 realizations using a Monte Carlo procedure for 1,3-dichloropropene efficacy against citrus nematode (Tylenchulus semipenetrans) using a threshold air-phase CT value of 12 µg h cm^–3 (Wang and Yates, 1999). Fields are 102-cm-wide beds. Application depth = 30 cm; application dosage = 327 kg ha^–1.