Herbicide rimsulfuron soil metabolism in maize fields
1996
Rouchaud, J. | Gustin, F. (Universite catholique de Louvain, Louvain-la-Neuve (Belgium). Lab. de phytopharmacie) | Callens, D. | Bulcke, R.
The herbicide rimsulfuron soil metabolism was studied at the level of 60 microg of active ingredients per kg dry soil, the soil being incubated in laboratory conditions. N(4,6-dimethoxypyrimidin-2-yl) N((3-ethylsulfonyl-2-pyridinyl))urea (2) was a transient soil metabolite. N-((3-ethylsulfonyl)-2-pyridinyl)-4,6-dimethoxy-2-pyrimidineamine (3) attained a maximum soil concentration after 20 days of incubation, and then progressively disappeared. 2-Hydroxy-3-ethylsulfonylpyridine (4) soil concentrations increased and attained a maximum after 40 days of soil incubation. 2-Amino-4,6-dimethoxypyrimidine (5) was generated simultaneously in lower soil concentrations. Similar rimsulfuron soil degradation pathways were observed in maize crop fields where rimsulfuron was applied at the rate of 10 g of ai per ha. The absence of accumulation of the heavy amine 3 cancels the concern about the potential formation of nitroso amino compound in soil. The rimsulfuron soil half-lives in maize crop field were increased by the recent organic fertilizer treatments. At crop end, rimsulfuron and its soil metabolites were no more detected in soil, the detection limit for each of these compounds being 0.5 microg of rimsulfuron equivalents per kg dry soil
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