Trifluralin Persistence in Congaree Soil1

The fate of some pesticides in Finnish cultivated soils

“…The slow degradation of trifluralin has been observed also in many earlier studies, e.g. Probst et al (1967) and Lafleur et al (1978) in field studies in the United States and Hayden and Smith (1980), Jensen andKimball (1980) andGrover et al (1988) in Cana-dian Held studies. In the Canadian studies three stages in the degradation of trifluralin have been demonstrated as described by Grover et al (1988).…”

Environmental Fate of Trifluralin

“…In Saskatchewan, Canada, Smith (1975) reported that only negligible residues of trifluralin were detected below the 10-cm depth in soils ranging from <2% to >10% organic matter content. LaFleur et al (1978) monitored formulated triflu- ralin incorporated in Congaree sandy loam soil and reported that trifluralin remained in the top 20 cm of the soil after 1024 d and 420 cm of rainfall. Duseja and Holmes (1978) did not detect trifluralin below the 20-cm depth when the herbicide was incorporated to a 1O-cm depth in Egam loam (1.3% OM) and Beason clay (2.1 % OM).…”

“…Savage (1978) monitored trifluralin (EC) dissipation in Sharkey clay (4.2% OM) and Bosket sandy loam (1.5% OM) under greenhouse conditions and also reported an initial rapid rate of loss followed by slower dissipation, with half-lives being 91 and 50 d, respectively. LaFleur et al (1978) reported that the initial disappearance of trifluralin applied at three rates to Congaree soil under field conditions was relatively rapid, with a first-stage half-life of about 19 d followed by a much slower dissipation phase lasting more than a year. Duseja and Holmes (1978) estimated half-lives in Beason clay (2.05% OM) and Egam loam (1.3% OM) near Nashville, TN, of 25.7 and 35.8 d, respectively, following sampling and analysis of the treated soils in the field at several intervals.…”

Persistence and Phytotoxicity of Dinitroaniline Herbicides in Manitoba Soils

“…The persistence and phytotoxicity of dinitramine (rf ,lf-diethyl-o,a,a-trifluoro-3,5-dinitrotoluene-2,4-diamine), fluchloralin (N-(2-chloroethyl)-2,.6-dinitro-Npropyl-4-(trifluoromethyl)aniline), profluralin (N-(cyclopropylmethyl)a,a,atrifluoro-2, 6-dinitro-N-propyl-p-toluidine), and trifluralin (a,a,o-tri-fluoro-2,6-dinitro-N-N-dipropyl-p-toluidine) were aniline), fluchloraline (N-(2-chloroethyl)-2, 6-dinitro-N-propyl-4-(trifluoromethylaniline), profluraline (N-(cyclopropylmethyl)a,a,a-trifloro-2, 6 dinitro-Npropyl-para-toluidine) et trifluraline (c,a,a-trifluoro dinitrq-2, 6 N, N-dipropryl para{oluidine (Helling 1976 (Miller et al 1975(Miller et al ,1978 (Lafleur et al 1978;Probst et al 1967 For personal use only. Trifluralin followed dinitramine in phytotoxicity, and profluralin and fluchloralin were least effective on the clay loam soil.…”