Persistence of three dinitroaniline herbicides on the soil surface.

摘要: Rates of loss trifluralin (a,oa,-trifluoro-2,6-dinitro-N,Ndipropyl-p-toluidine), fluchloralin [N-(2-chloroethyl)-2,6-dinitro-Npropyl4-(trifluoromethyl)anilinel, and pendimethalin (N-(1-ethylpropyl)-3,4-dimethyl-2,6-dinitrobenzenamineI from soil surfaces were evaluated in a series field sampling studies. Herbicides sprayed onto enclosed rings with nylon mesh bottoms, exposed to conditions, analyzed periodically by gas chromatography. The herbicides lost rapidly the first 3 5 days Bosket silt loam Sharkey clay, although initial rate was less rapid clay. Trifluralin more than pendimethalin. Half-life values for trifluralin, fluchloralin, pendimethalin, respectively, 2, 1.5, 4 on 4, 6 much lower remainder 7or 12-day periods. Rainfall day period resulted increased all herbicides. Shading direct sunlight greatly reduced as compared exposure full sunlight, remained fairly under shaded conditions. Simulated rainfall significantly dissipation Additional index words. Delayed incorporation,