title: Soil residue analysis and degradation of saflufenacil as affected by moisture content and soil characteristics.
abstract: BACKGROUND
  Saflufenacil dissipation in soils under different moisture conditions is not available in the scientific literature. The objective of this study was to evaluate saflufenacil degradation and persistence in soils from rice regions under field capacity (non-flooded) and saturated (flooded) conditions.
  
  
  RESULTS
  The accelerated solvent extraction (ASE) residue analytical method developed to conduct the study resulted in recovery greater than 80% for the combinations of soils and moisture conditions. Saflufenacil degradation was faster at field capacity for all soils, except for Morey soil. Herbicide half-life was 28.6, 15.0 and 23.1 days under field capacity treatments and 58.8, 36.9 and 79.7 under saturated conditions for Nada, Crowley and Gilbert soils respectively. A half-life no longer than 80 days was observed for the combination of soils and moisture treatments.
  
  
  CONCLUSIONS
  An ASE method was developed and used to extract saflufenacil from soil samples. Half-life averaged among soils was 59 and 33 days for saturated and field capacity respectively. Saflufenacil persistence in the environment was 2-3 times longer under flooded conditions for most of the soils studied.
authors.affiliation: Department of Soil and Crop Sciences, Texas A&M University, College Station, TX, USA; CNPq, Conselho Nacional do Desenvolvimento Científico e Tecnológico, Brasília, DF, Brazil.
authors.forename: Edinalvo R
authors.initials: ER
authors.lastname: Camargo
authors.forename: Scott A
authors.initials: SA
authors.lastname: Senseman
authors.forename: Richard L
authors.initials: RL
authors.lastname: Haney
authors.forename: John B
authors.initials: JB
authors.lastname: Guice
authors.forename: Garry N
authors.initials: GN
authors.lastname: McCauley
mesh_terms: D006207:Half-Life; D006540:Herbicides / Q000737:chemistry*; D011744:Pyrimidinones / Q000737:chemistry*; D012987:Soil / Q000737:chemistry*; D012989:Soil Pollutants / Q000737:chemistry; D013449:Sulfonamides / Q000737:chemistry*; D014867:Water / Q000032:analysis
chemical_list: D006540:Herbicides; D011744:Pyrimidinones; D012987:Soil; D012989:Soil Pollutants; D013449:Sulfonamides; D014867:Water; C552482:N'-(2-chloro-4-fluoro-5-(3-methyl-2,6-dioxo-4(trifluoromethyl)-3,6-dihydro-1(2H)-pyrimidinyl)benzoyl)-N-isopropyl-N-methylsulfamide
keywords: Sharpen®; accelerated solvent extraction; field capacity; flooded; half-life