HOME HELP FEEDBACK SUBSCRIPTIONS ARCHIVE SEARCH TABLE OF CONTENTS		QUICK SEARCH:   [advanced] Author: Keyword(s): Year:  Vol:  Page:

This Article Full Text (PDF) Alert me when this article is cited Alert me if a correction is posted Services Similar articles in this journal Alert me to new issues of the journal Download to citation manager Citing Articles Citing Articles via Google Scholar Google Scholar Articles by Majka, J. T. Articles by Muzik, T. J. Search for Related Content PubMed Articles by Majka, J. T. Articles by Muzik, T. J. Agricola Articles by Majka, J. T. Articles by Muzik, T. J.

Dissipation of Massive Quantities of 2,4-D and 2,4,5-T n-Butyl Esters in Field Mini-Lysimeters¹

ABSTRACT

The patterns of dissipation of 2,4-D (2,4-dichlorophenoxyacetic acid) and 2,4,5-T (2,4,5-trichlorophenoxyacetic acid) n-butyl esters, applied in 1:1 mixtures at 560 or 2,800 kg/ha of each herbicide to soils in field mini-lysimeters, were monitored periodically from December 1976 to April 1979. The lysimeters were located in Pullman, Wash., and packed with soils from Washington, Wyoming, and Mississippi. Both 2,4-D and 2,4,5-T were dissipated to < 1% of the initial concentration at the lower application rate in the Washington and Wyoming soils; however, at the higher application rate, dissipation of 2,4-D was greatly impeded and dissipation of 2,4,5-T was negligible in these soils. Dissipation of both herbicides in the acidic Mississippi soil was extremely slow even at the lower application rate. Surface soil pH was lowered following herbicide application. Some downward movement of both herbicides from the 0- to 5-cm to the 5- to 10-cm soil layer was evident. By the end of the experimental period, revegetation had begun only on the Washington and Wyoming soils treated at the lower application rate.

Key Words: herbicides • degradation • chemical spills • disposal

¹ Contribution of the Dep. of Agronomy and Soils, Washington State University, Pullman, WA 99164. Scientific Paper no. 6050. College of Agriculture Research Center Project 1811. Research partially supported by funds from the U.S. Air Force Academy.

² Former Graduate Research Assistant and Professors, respectively.

Received for publication October 23, 1981.