Use of Empirical Equations to Describe Dissipation of Metribuzin and Pendimethalin

Weed Science - Tập 42 Số 2 - Trang 241-248 - 1994
Robert L. Zimdahl1, Brian K. Cranmer1, Walter W. Stroup2
1Weed Res. Lab, Dep. Plant Pathol, and Weed Sci., Colorado State Univ., Ft. Collins, CO 80523
2Dep. Biometry, Univ. Nebraska, Lincoln, NE 68583

Tóm tắt

Four equations were evaluated as predictors of the rate of herbicide dissipation in soil. A biexponential equation was superior to the first-order equation for metribuzin and pendimethalin dissipation under five moisture levels and three temperatures in laboratory and field studies. The Hoerl function, adapted in the course of this work, is also a good descriptor. The first-order equation predicts slower initial and more rapid later dissipation than actually occurs and these deficiencies are not shared by the biexponential or Hoerl equations. The first-order equation ignores small residues remaining late in the dissipation process. These residues are important from an environmental point of view and the Hoerl and biexponential equations are more capable of dealing with them.

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Tài liệu tham khảo

Hamaker, 1972, Organic Chemicals in the Soil Environment, 253

Abbreviations: BMDP-AR, Biomedical computer programs-Derivative-free nonlinear regressions; RSS, residual sum of squares

Gas Chrom Q. Appl. Sci. Labs, State College, PA.

Hamaker J. W. and Goring C. A. I. 1976. Turnover of pesticide residues in soil. Pages 219–243 in Kaufmann D. D. , Still G. G. , Paulson G. P. , and Bandal S. K. , eds. Bound and Conjugated Pesticide Residues. Am. Chem. Soc. Symp. Ser. 29. Washington, DC.

Varian model 3700.

Hamaker J. W. 1966. Mathematical prediction of cumulative levels of pesticides in soil. Pages 122–131 in Gould R. F. , ed. Organic Pesticides in the Environment. Am. Chem. Soc. Symp. Ser. 60. Washington, DC.

Reyes, 1988, Mathematical description of trifluralin degradation in soil, Weed Sci., 37, 314

Draper, 1981, Applied Regression Analysis, 157

Biomedical computer programs-Derivative-free nonlinear regressions. BMDP Statistical Software, Inc., Los Angeles, CA.

Zimdahl, 1977, Soil degradation of three dinitroanilines, Weed Sci., 25, 247, 10.1017/S0043174500033397

Hance, 1983, Pesticide Residues and Formulation Chemistry, 4, 195

Poku, 1980, Soil persistence of dinitramine, Weed Sci., 28, 650, 10.1017/S0043174500061439

Hoerl, 1954, Chemical Business Handbook, 55

10.1097/00010694-197811000-00005

10.1111/j.1365-3180.1970.tb00919.x

10.2134/agronj1955.00021962004700020014x

Hyzak, 1974, Rate of dissipation of metribuzin and three analogs in soil, Weed Sci., 22, 75, 10.1017/S0043174500036560

10.1002/ps.2780100602

10.1097/00010694-198008000-00006

10.2134/jeq1982.00472425001100040024x

10.2134/jeq1983.00472425001200040024x

Rahn, 1973, Soil degradation of two phenyl pyridazinones, Weed Sci., 21, 314, 10.1017/S0043174500027077

Walker, 1987, Herbicide persistence in soil, Rev. Weed Sci., 3, 1

10.1002/ps.2780080409

Zimdahl, 1984, Degradation of pendimethalin in soil, Weed Sci., 32, 408, 10.1017/S004317450005921X

10.1002/ps.2780020109

Peters, 1965, Methods of Soil Analysis, 279

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Weed Science

Tập 42 Số 2

241-248

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