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Isoproturon Sorption and Degradation in a Soil from Grassed Buffer Strip

INRA, Institut National de la Recherche Agronomique, Unité de Science du Sol, BP 01, 78850 Thiverval-Grignon, France.

B. Réal

ITCF, Institut Technique des Céréales et des Fourrages, Service Technique de Production, 80200 Estrées-Mons, France.

^* Corresponding author (benoit{at}grignon.inra.fr).

ABSTRACT

The fate of the herbicide isoproturon [3-(4-isopropylphenyl)-l,1-dimethylurea] was investigated in soil from a grassed buffer strip. Compared to a cropped soil originating from the same experimental site (K_d = 1.8 L kg^–1), sorption of isoproturon was enhanced in the grassed soil and especially in the surface layer (0-2 cm) containing high proportion of nondecomposed plant residues (K_d = 5.0 L kg^–1). Nonhumified organic fractions isolated from the surface soil layer and corresponding to above and bdow-ground plant residues derived from the grass exhibited high sorption coefficients K_d and K_oc compared to the rest of the soil. Reversibility of sorption was lower in the grassed soil than in the cropped soil and decreased rapidly with time. A rapid degradation of isoproturon was observed at different depths of the grassed soil whereas most of the herbicide remained nondegraded in the cultivated soil: half-lives were respectively 72 d in the cultivated soil, and only 8 d in the superficial layer (0–2 cm) of the grassed soil. The highest mineralization rate of the isoproturon ring (20% after 35 d) was observed in the top layer (0–2 cm) having the highest mineralization rates of organic matter. In relation with this fast degradation, a large proportion of isoproturon residues became nonavailable to water and methanol extractions (54% of the initial applied isoproturon found as nonextractable (bound) residues). Thus the grassed strip surface soil had a high potential to dissipate isoproturon trapped from run-off.

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