Influence of slurry and ammonium nitrate fertilizations on soil and plant metabolism of chlorpyrifos in field cauliflower

The influence of soil fertilization with a slurry formulation on the rate of chlorpyrifos soil metabolism in a cauliflower field crop was studied. Slurry soil fertilization with ammonium nitrate increased chlorpyrifos absorption onto soil organic matter, and likewise, increased the stability of the insecticide relative to its soil metabolism. The fertilizer treatments served to maintain higher insecticide levels in soils under cropping than in unfertilized soils. Chlorpyrifos and metabolite concentrations in foliage were greater for plants grown on slurry fertilized soils than on nonfertilized plots.