?DEGRADATION OF 14C-LABELLED CYFLUTHRIN IN SOIL AND INCORPORATION OF 14CINTO HUMUS FRACTIONS AS AFFECTED BY WHEAT STRAW AMENDMENT AND MOISTURE CONDITIONS

Authors

  • ASMA LoDHI Nuclear Institute for Agriculture and Biology (NIAB), Faisalabad, Pakistan
  • S.H.M. NAQVi Nuclear Institute for Agriculture and Biology (NIAB), Faisalabad,Pakistan
  • F. FUHR Nuclear Institute for Agriculture and Biology (NIAB), Faisalabad, Pakistan
  • F. AzAM Nuclear Institute for Agriculture and Biology (NIAB), Faisalabad, Pakistan

Keywords:

14C,Cyfluthrin, Degradation, Moisture, Pesticides, Wheat straw.

Abstract

Anincubationexperimentwasconductedinthelaboratoryto studytheeffectofmoistureandwheatstrawamend-
ment on the mineralization and transformationof phenyl-t'C cyfluthrin (activeingredientof Baythroid, aninsecticide
manufactured by Bayer AG, Leverkusen, Germany) into differentsoil fractions.The treated soil was incubated at40,
60 or 100%water holding capacity (WHC) moisture and with or without wheat straw amendment. After 18weeks of
incubation, 44-58% of the cyfluthrin-r'Cwas lost fromthesoil asCOr Mineralizationof cyfluthrin was more rapid in
unamended soilandatlowermoistureregimes;themaximumbeingat40%WHC.Inunamendedsoil,ahigherpropor-.
tion of the applied 14Cwas found in forms extractable with methanol (anefficient solvent of cyfluthrin). In amended
soil, on theother hand,a greaterproportionoftheadded14Cwasfoundinbound formsi.e.,fulvic acid,humic acid and
humins. Transformation of cyfluthrin-v'Cinto stable humic compounds was more intense at lower moisture regimes.
However, in all treatments, a higher proportion of bound residues extractable with alkali was present in fulvic acid
fraction.

Published

1996-08-19

How to Cite

LoDHI, A., NAQVi, S., FUHR, F., & AzAM, F. (1996). ?DEGRADATION OF 14C-LABELLED CYFLUTHRIN IN SOIL AND INCORPORATION OF 14CINTO HUMUS FRACTIONS AS AFFECTED BY WHEAT STRAW AMENDMENT AND MOISTURE CONDITIONS. Biological Sciences - PJSIR, 39(5-8), 128–131. Retrieved from https://v2.pjsir.org/index.php/biological-sciences/article/view/2389