Abstract
Absorption and translocation of O-ethyl S, S-diphenyl phosphorodithiolate (Hinosan) in rice plants were studied by means of techniques of gas-liquid chromatography, radioautograph and 32P-radioactivity determination. 32P-labeled Hinosan was used in the present study. Hinosan on the surface of a leaf and on a glass plate was dissipated in a much slower rate than the other phosphorus pesticides tested. Hinosan was chemically transformed to a small extent after taken up into the plant tissues and largely remained in the local region. Up- and downward translocation of Hinosan occurred slightly in the ride seedlings. Translocation and accumulation of Hinosan were also studied concerning with growth stage of rice plants, such as the seedling, the milk-ripening, and the ripening stage. Accumulation in grains was in most cases found to be less than the limit of determination. Translocation of Hinosan was discussed in relation to physiological conditions of rice plants.
