A review, with 94 refs., of physicochem. and biolog. properties of sulfonylurea triazine and pyrimidine rings-contg. herbicides. They were not only absorbed by plants but they could also seep into the soil where they underwent sorption and degrdn. The intensity and speed of the phenomena weare inversely correlated with the soil pH values and directly correlated with the soil temp. and humidity as well as with the biomass of soil microorganisms.