A laboratory study of the mineralization and binding of 14C-labeled herbicide rimsulfuron in a rendzina soil.

L O Metzger, C Munier-Lamy, M J Belgy, F Andreux, T Chone, J C Védy

CPB-CNRS, Vandoeuvre-les-Nancy, France.

Chemosphere 1999 Nov

filter terms:

The fate of pyrimidine-2-14C-rimsulfuron in a rendzina soil was investigated using a laboratory microcosm approach. Measurement of CO2 evolution suggested that rimsulfuron applied at 5 times the recommended dose did not affect soil respiration. Under abiotic conditions, no mineralization of 14C-rimsulfuron into 14C-CO2 occurred and under biotic ones it was very low reaching 0.75% of the applied 14C-rimsulfuron after 246 days of incubation. The analysis of data showed that a three-half order model provided the best fit for the mineralization curve. Extractable 14C-residues decreased over time to 70-80% of the applied 14C-rimsulfuron at the end of the incubation. After 246 days of incubation, non extractable residues (NER) accounted for up to 24.7% of the applied 14C-rimsulfuron and were distributed according to organic carbon in soil size fractions, suggesting a progressive incorporation process of NER to soil humus.

Citation

L O Metzger, C Munier-Lamy, M J Belgy, F Andreux, T Chone, J C Védy. A laboratory study of the mineralization and binding of 14C-labeled herbicide rimsulfuron in a rendzina soil. Chemosphere. 1999 Nov;39(11):1889-901