Abstract
With a computer model, pesticide behavior in soil after spring application to a sandy loam field with a potato crop, was simulated. Special attention was paid to the risk of leaching through the upper meter of soil in catchment areas. Unsaturated water flow resulting from rainfall was modeled in some detail. Uptake of water and solute by the developing root system of the annual crop was included in the model. The computations were carried out for hypothetical pesticides with first-order decomposition rate constants in soil of 0.03, 0.01, 0.003, and 0.001 day−1 at 20°C. Adsorption decreased with increasing soil depth and the adsorption coefficient for the top layer ranged from 0.0 to 10.0. For 20 combinations of decomposition rates and adsorption strengths, the extent of leaching from a top layer 1 m thick was computed. With a decomposition rate constant at 20°C of 0.03 day−1 or higher, leaching was extremely low; with 0.01 days−1 leaching was 1.7% of the dosage or lower. For compounds with a high persistence and mobility, leaching from the soil ranged up to about 10% of the dosage or more. Besides decomposition, uptake by plants was an important factor in reducing leaching, particularly for the weakly adsorbed and comparatively persistent compounds.
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Durrant, M. J., Love, B. J. G., Messem, A. B., and Draycott, A. P.: 1973, Ann. Appl. Biol. 74, 387.
Endrödi, G. and Rijtema, P. E.: 1969, Neth. J. Agric. Sci. 17, 283.
Frissel, M. J. and Reiniger, P.: 1974, Simulation of Accumulation and Leaching in Soils, Centre for Agricultural Publishing and Documentation (Pudoc), Wageningen, The Netherlands, 116 pp.
Getzin, L. W.: 1968, J. Econ. Entom. 61, 1560.
Graham-Bryce, I. J.: 1969, J. Sci. Fd. Agric. 20, 489.
Hamaker, J. W.: 1972, Organic Chemicals in the Soil Environment (Goring, C. A. I. and Hamaker, J. W., eds.), Vol. 1. Marcel Dekker Inc., New York, p. 253.
Hamaker, J. W. and Thompson, J. M.: 1972, Organic Chemicals in the Soil Environment (Goring, C. A. I. and Hamaker, J. W., eds.), Vol. 1. Marcel Dekker Inc., New York, p. 49.
IBM: 1972, System/360 Continuous System Modeling Program. User's Manual, Program Number 360ACX-16X.
Keulen, H. van and Beek, C. G. E. M. van: 1971, Neth. J. Agric. Sci. 19, 138.
KNMI: 1969–1973, Maandeltiks Overzicht der Weersgesteldheld, Royal Netherlands Meteorological Institute, De Bilt, The Netherlands.
KNMI: 1972, Klimaatatlas van Nederland, Royal Netherlands Meteorological Institute, De Bilt. Staatsuitgeverij, The Hague, The Netherlands.
Rijtema, P. E.: 1969, Soil Moisture Forecasting, Nota 513. Institute for Land and Water Management Research, Wageningen, The Netherlands, 28 pp.
Walker, A.: 1970, Pestic. Sci. 1, 237.
Walker, A.: 1972a, Pestle. Sci. 3, 139.
Walker, A.: 1972b, Proc. 11th Brit. Weed Control Conf., 800. Walker, A.: 1973, Proceedings of the European Weed Research Council Symposium on Herbicides and the Soil, Versailles, 240.
Walker, A.: 1974, J. Environ. Qual. 3, 396.
Wit, C. T. de and Keulen, H. van: 1972, Simulation of Transport Processes in Soils, Centre for Agricultural Publishing and Documentation (Pudoc), Wageningen, The Netherlands, 100 pp.
Zimdahl, R. L., Freed, V. H., Montgomery, M. L., and Furtick, W. R.: 1970, Weed Res. 10, 18.
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Leistra, M., Dekkers, W.A. Computed leaching of pesticides from soil under field conditions. Water Air Soil Pollut 5, 491–500 (1976). https://doi.org/10.1007/BF00280848
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DOI: https://doi.org/10.1007/BF00280848