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ABSTRACT
The residual effects of three herbicides (Atrazine, Glyphosphate and Paraquat) on soil collected from the Teaching and Research farm, Faculty of Agriculture, Benson Idahosa University was examined. After contamination of soil with the three different herbicides, the soil was allowed to remain undisturbed for an incubation period of thirty (30) days. This was done to enable the contamination stabilize. After which soil samples were then collected according to their treatments (herbicides) and made into a composite which was then analyzed for physical and chemical properties in the laboratory. It was observed that the soil before contamination (i.e the control) was fertile and slightly acidic. After contamination with Atrazine, there were changes in pH and other nutrients were also affected. After contaminaton with Glyphosphate, the soil pH was not significantly affected but other nutrients were affected. After the contamination with paraquat, every parameter showed changes apart from the textural class which still remained Sandy clay loam. Herbicides have residual effects on soil but they however differ from eachherbicide. The effects were not also the same for the various soil nutrients.
