Dissipation of nicosulfuron and rimsulfuron in surface soil.
Field and soil fortification studies were conducted to evaluate the half-lives (DT(50)) of nicosulfuron and rimsulfuron in a Sequatchie silt loam surface soil. The dissipation of each herbicide was also evaluated with the two compounds applied simultaneously, which is a typical application method used in corn production. Field studies in two years indicated that both herbicides alone and in mixture disappeared quickly, with all DT(50) < 6 days. Environmental conditions including warm, moist soil, and a soil pH of 5.7 encouraged rapid herbicide dissipation. Rapid degradation was observed under laboratory conditions using this same soil, with all DT(50) < 3 days. This research indicated minimal risk of carry-over to subsequent rotational crops and minimal residual weed control from these herbicides when applied to a silt loam soil under ambient climatic conditions in Tennessee.
Department of Plant Sciences and Landscape Systems, The University of Tennessee, 2431 Center Drive, Knoxville, Tennessee 37996, USA.
Cheryl Ashburn
CA
Poppell
Robert M
RM
Hayes
Thomas C
TC
Mueller
D006207:Half-Life; D006540:Herbicides / Q000737:chemistry*; D006358:Hot Temperature; D006863:Hydrogen-Ion Concentration; D015394:Molecular Structure; D011725:Pyridines / Q000737:chemistry*; D012987:Soil / Q000032:analysis*; D013449:Sulfonamides / Q000737:chemistry*; D013453:Sulfonylurea Compounds / Q000737:chemistry*
D006540:Herbicides; D011725:Pyridines; D012987:Soil; D013449:Sulfonamides; D013453:Sulfonylurea Compounds; C447879:rimsulfuron; C416723:nicosulfuron