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Title:The Fate of Dcpa and Diazinon in Turf Using Model Ecosystems
Author(s):Branham, Bruce Eugene
Department / Program:Horticulture
Discipline:Horticulture
Degree Granting Institution:University of Illinois at Urbana-Champaign
Degree:Ph.D.
Genre:Dissertation
Subject(s):Biology, Plant Physiology
Abstract:The environmental fate of two pesticides, DCPA (Dacthal) and Diazinon, was examined using model ecosystems. Experiments were designed to determine the effectiveness of the model ecosystem in pesticide research and to measure the effect of thatch and irrigation frequency on the transformation and movement of the two pesticides. Results from the experiments with Dacthal indicated the herbicide did not move from the point of application. The only movement of the herbicide occurred after degradation of Dacthal to two nonbiologically active metabolites which were leached through the soil profile. Increasing irrigation caused an increased rate of Dacthal degradation. The presence of a thatch layer caused a variable effect on the rate of degradation of Dacthal.
Volatilization, leaching, and evolution of ('14)CO(,2) from ('14)C-labeled Diazinon were observed. Thatch caused a significant increase in the degradation rate of Diazinon compared to turf without thatch. The effect of irrigation, daily versus every four days, was significant in thatch but not in turf without thatch.
The model ecosystem appears to be a useful tool in pesticide research. Large amounts of data can be collected quickly in a more realistic environment than a laboratory or greenhouse study.
Issue Date:1983
Type:Text
Description:80 p.
Thesis (Ph.D.)--University of Illinois at Urbana-Champaign, 1983.
URI:http://hdl.handle.net/2142/71771
Other Identifier(s):(UMI)AAI8324513
Date Available in IDEALS:2014-12-16
Date Deposited:1983


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