Movement of certain agricultural chemicals in soil was studied in the laboratory by measurement of the Ri values of monuron, diuron, bromacil, terbacil, and chloroneb on thin layers (400 p) of soil deposited on glass plates and developed in water, and by determination of the Freundlich isotherm constants (K) of these chemicals in soil-water systems. The relationship of the Freundlich constants (K) to the Ri values is discussed. An empirical equation relating these constants for the above agrichemicals on Keyport silt loam is shown to be K = (1 IRi -1) + 0.85.

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