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Fate of Methabenzthiazuron in Calcareous Soils from Southeastern Spain

Estación Experimental del Zaidín, (CSIC), Profesor Albareda, 1, P.O. Box 419, 18008-Granada ( Spain);

M. Barifouse M., F. S. Rasero, A. Peña H., C. de la Colina G. and G. Dios C.

Instituto Biológico, Avda. Conselheiro Rodrigues Alves 1252, 01402-023 So Paulo Brazil.

^* Corresponding author (eromero{at}eez.csic.es).

ABSTRACT

Adsorption, incubation, and soil column experiments with methabenzthiazuron [1-(1,3-benzothiazol-2-yl-)-1,3-dimethylurea] (MBT) were carried out on soils from the surrounding fertile plain of Granada (southeast Spain). The isotherms of MBT adsorption followed the Freundlich model. Due to the similar physico-chemical and mineralogical properties of the soils from this area, the K_f values were only correlated with soil clay content, smectite content, and soil surface area. Methabenzthiazuron degradation did not occur in the soils, under our experimental conditions, for incubation periods of up to 42 d. Methabenzthiazuron was not detected in the eluates from the clay and silt loam soil columns; it was retained in the first 3-cm layer and the retardation factor values, R, were 24 and 14, respectively. A computation model simulating a uniform flow of water and instantaneous adsorption-desorption equilibrium is suitable for the description of MBT in the G-8 soil but showed an overestimation in the G-11 soil column.

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