Division of Nematology, Indian Agricultural Research Institute, New Delhi-110 012.
Persistence of phenamiphos in soil at 31 ± 1°C was enhanced by increasing clay content resulting in longer half-life. Addition of organic matter initially enhanced its persistence but further increase resiilted in faster dissipation. Sand had negligible effect, on overall elution of the chemical into soil water: but clay and organic matter adversely affected elution and sorption coefficient. Adsorption of phenamiphos was of higher order onto clay than organic matter.
Phenamiphos, dissipation, adsorption, clay, sand, organic matter
