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Pesticide Leaching Potential in Ord River Irrigation Area. Lawrence Ak Saing Supervisor: Dr. Faisal Anwar. Outline. Introduction Objective Pesticide cycle Pesticides and Groundwater Factors affecting pesticide leaching Study area Methodology Results Discussion

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pesticide leaching potential in ord river irrigation area

Pesticide Leaching Potential in Ord River Irrigation Area

Lawrence AkSaing

Supervisor: Dr. Faisal Anwar

outline
Outline
  • Introduction
  • Objective
  • Pesticide cycle
  • Pesticides and Groundwater
  • Factors affecting pesticide leaching
  • Study area
  • Methodology
  • Results
  • Discussion
  • Conclusion & Recommendation
introduction
Introduction
  • Pesticide is a general term used to refer to the chemicals that used to kill or control pests
  • A very significant nonpoint source of groundwater contamination
  • Groundwater vulnerability assessment involves determination of how likely the area will be contaminated by the pesticides
objective
Objective
  • To assess pesticide leaching of the study site
  • To identify high pesticide risk area and high leaching pesticide
  • To develop a better understanding of pesticide impact on groundwater resources
pesticides and groundwater
Pesticides and Groundwater
  • Pesticides can get into the groundwater by leaching through soil
  • It takes a very long time to break down
  • Two important processes
    • Sorption
    • Degradation
factors affecting pesticide leaching
Factors affecting pesticide leaching
  • Pesticide properties (sorption and degradation)
  • Soil texture and structure
  • Environmental factors
  • Pesticide application
study site
Study Site
  • Ord River Irrigation Area
    • Situated in the east Kimberly region of Western Australia
    • Main crops grown in ORIA are sugarcane, cucurbits, fruits, and hybrid seeds

Cununurra Clay soil

methodology
Methodology
  • Two screening models are used to assess leaching potential of 24 pesticides in ORIA
  • Vulnerability Index (VI)
    • Index Model by Schlosser et al.
  • Pesticide Index Rating Index (PIRI)
    • Software package developed by CSIRO
vulnerability index
Vulnerability Index
  • Vulnerability index is calculated based on the considered factor
  • Pesticides are grouped into three leachability groups based on their leachability ratio

(Low, Moderate and High leachability groups)

results vulnerability index mapping
Results - Vulnerability Index Mapping
  • Three vulnerability maps created for each leachability group

High vulnerability map

Low vulnerability map

Moderate vulnerability map

pesticide impact rating index
Pesticide Impact Rating Index
  • Covers surface and groundwater risk assessment
  • Relative risk rating of different pesticides
  • Relative risk rating among land uses
results pesticide impact rating index
Results - Pesticide Impact Rating Index
  • Chemical of concern for different land uses
discussion
Discussion
  • Six pesticides identified as high leaching pesticides by VI
  • Five pesticides identified as high leaching pesticides by PIRI
discussion1
Discussion
  • Presence of pesticide residue in groundwater
    • Atrazine was found in some areas
    • None of chlorpyrifos and endosulphan were detected
    • Pesticide detection limits
discussion2
Discussion
  • Atrazine detection borewell (November 2006)
  • Atrazine detection borewell (June 2006)
conclusion recommendation
Conclusion & Recommendation
  • Risk assessment is for decision making
  • Relative risk rating of pesticides to groundwater contamination
  • Useful for identifying high risk pesticides and locations
  • Pesticides for monitoring
conclusion recommendation1
Conclusion & Recommendation
  • Creating the risk map with the incorporation of GIS
  • More field data on GW to help verify the results