Atrazine Efficacy and Interactions with Poultry Litter

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Title: Atrazine Efficacy and Interactions with Poultry Litter
Author: Morrow, Karen Steele
Advisors: Richard McLaughlin, Committee Chair
Alan York, Committee Member
Robert Mikkelsen, Committee Member
Abstract: The purpose of this study has been to investigate interactions between soil, poultry litter and atrazine (2-chloro-4-ehtylamino-6-isopropylamino-1,3,5-triazine). Consideration was given to atrazine efficacy, leaching and sorption when applied in conjunction with poultry litter. Application of recommended amounts of poultry litter increased the average mass of oats and soybeans and the application of atrazine increased soybean chlorosis and oat fatality. Leachate from pots that had atrazine applied in conjunction with composted and weathered poultry litter was collected and analyzed for atrazine, DIA (2-chloro-4-ethylamino-6-amino-1,3,5-triazine) and desethylatrazine or DEA (2-chloro-4-amino-6-isopropyl-amino-1,3,5-triazine), using solid phase extraction and GC-MS. Greater amounts of poultry litter significantly increased the amount of leachate from the pots and the amount of leached atrazine was dependent on leachate volume. The sorption of atrazine onto soil and poultry litter was measured through a batch adsorption experiment and Freundlich (Kf) adsorption constants were calculated. Stockpiled litter at the recommended rate (1X) had the lowest Kf (0.68) followed by soil (1.06), 3X stockpiled litter and soil (1.17), 1X weathered litter and soil (1.20), 3X weathered litter and soil (1.93), stockpiled litter (17.65), and weathered litter (33.76).
Date: 2003-04-22
Degree: MS
Discipline: Soil Science

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