Effect of soil conditioner on soil adsorption of insecticide

Abstract

Soil adsorption of insecticides was tested, when the mixture of soil conditioners and sand was used as bed soil.
84% MEP treated on soil was adsorbed in case of the mixture of humus material mainly containig humic acids and sand, however, less than 20% treated MEP was adsorbed in the case of only sand.
Perlite and vermiculite didn't increase soil adsorption of insecticide compared to only sand. Tested what kind of factor effected the amount of adsorption of MEP, it was dependent on both the rate of treaaed MEP and the rate of humusmaterial in the soil.
Both high rate of treated MEP and the mixed soil containig humus highly increased the amount of adsorption of insecticide.
A large amount of watering after treated diazinon brought diazinon to deeper soil area.
Also, addition of soil penetrative material, AQUA-GRO to diazinon got the same result. This test suggested that soil adsorption of insecticides might be caused by the physical bond between soil and insecticide.