Abstract
Soil samples were taken periodically from plots treated with hexazinone (1.0 kg a.i./ha) and untreated control plots at different depths of the Obafemi Awolowo University Teaching and Research Farm before hexazinone application and for a period of 112 days after application (DAA). Soil samples were also taken at the 0–7.5 cm layer in an adjacent undisturbed forest plot. Mites were extracted from the soil samples and compared for differences and similarities in densities. In the control plots, the 0–7.5 cm soil layer supported the highest percentages of soil mites on all sampling occasions while in the hexazinone plots the 7.5–15.0 cm soil layer supported the highest percentages of soil mites between 84 and 112 days after application. During the first 56 days, mite densities decreased in the forest and increased in the untreated control plots. Between 56 and 112 days after application, mite densities increased in the forest, did not change in the control plots and decreased in the hexazinone plots. Almost all dominant mite groups were significantly less abundant in the hexazinone plots than the untreated control plots in the 0–7.5 and 7.5–15.0 cm soil layers. At the 15.0–22.5 cm soil layer, the density of Annectacarus sp. was unusually very high in the hexazinone plots.
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