For DHA, similar ED values were predicted for the two models (Table 3), and the goodness of fit was similar for both models, as can be deduced from the correlation coefficient values (r 2 ). As happened for ATP, an increase of ED values for DHA inhibition was observed in the cultivated soil 60 days after soil contamination in relation to the values for DHA inhibition 3 h after soil contamination. For the uncultivated soil after 3 h, the ED values were similar to those of cultivated soil, but in the former soil, there was a decrease of ED values after 20 days. Then these values increased after 60 days, but this increase was lower than that observed in the cultivated soil.