bill johnson university of missouri. a decision support system for weed management university of...
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Bill JohnsonUniversity of Missouri
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A Decision Support System for Weed Management
University of Nebraskaand
North-Central Partner States
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ObjectiveObjective• Develop a biology and
economics based weed management decision support tool for crop managers
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Development TeamDevelopment Team
• Weed Scientists
• Information systems specialist
• Listening group-Users
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WeedSOFT Partner States
IllinoisIllinois MichiganMichiganIndianaIndiana MissouriMissouriKansasKansas NebraskaNebraska
WisconsinWisconsin
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WeedSOFTWeedSOFT
Bioeconomic DecisionBioeconomic Decision
Groundwater VulnerabilityGroundwater VulnerabilityGroundwater Risk AssessmentGroundwater Risk Assessment
Weed IdentificationWeed Identification
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EnviroFXEnviroFXSite and product specific assessment of groundwater contamination risk
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MapVIEWMapVIEWColor coded county maps depicting vulnerability of groundwater to contamination
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WeedVIEWWeedVIEWVisual images as an aid in weed identification
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AdvisorAdvisorComputes crop yield and dollar loss based
on weed density, weed free yield and
crop price
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Weed Management StrategiesWeed Management Strategies
• Cultivation
• Pre herbicide
• Post herbicide
• Combined strategies
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Treatment Selection CriteriaTreatment Selection Criteria
• Geographical restrictions• Soil properties• Rotational crop• Ground and surface water
restrictions• Crop and weed growth stage
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ADVISORADVISOREvaluation of pre,
post, pre+post weed management strategies in five crops:
corn, sorghum, soybeans, sugarbeets, wheat
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State Specific Parameters
HerbicidesHerbicides Soil Properties Soil PropertiesHerbicide EfficacyHerbicide Efficacy Rotational Restrictions Rotational RestrictionsApplication Rates Application Rates Geographical Restrictions Geographical Restrictions Weed Species Weed Species Weed Competitive Index Weed Competitive Index
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Input application informationInput application information
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Input crop informationInput crop information
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Input environmental informationInput environmental information
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Input weed informationInput weed information
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OutputOutput
• Ranking of strategies based on net return or yield
• Detailed economic and efficacy analysis of treatments
• Change in weed seed bank with each treatment
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Treatment Ranking and AnalysisTreatment Ranking and Analysis
Seedbank change
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WeedSOFT as a WeedSOFT as a Teaching ToolTeaching Tool
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Biological FactorsBiological Factors• Crop and weed species competitiveness• Influence of crop and weed growth
stage on crop-weed interference• Influence of crop row spacing on crop
competitiveness• Influence of precipitation on herbicide
efficacy and rotational crop risk
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17.2/40 = 43%
Corn, Weed free yield = 150 bu/ACorn, Weed free yield = 150 bu/A
Soybeans, Weed free yield = 40 bu/ASoybeans, Weed free yield = 40 bu/A
17.5/150 = 12%
Crop Species CompetitivenessCrop Species Competitiveness
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Corn 0-5” height; weed free yield = 150 bu/ACorn 0-5” height; weed free yield = 150 bu/A
17.5/150 = 12%
8.9/150 = 6%
Weed Species CompetitivenessWeed Species Competitiveness
Common cockleburCommon cocklebur
Redroot pigweedRedroot pigweed
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Corn 0-5” height; Weed free yield = 150 bu/ACorn 0-5” height; Weed free yield = 150 bu/A
17.5/150 = 12%
Weed Competitiveness Based on Weed HeightWeed Competitiveness Based on Weed Height
Cocklebur 2-4” heightCocklebur 2-4” height
Cocklebur 4-8” heightCocklebur 4-8” height25.1/150 = 17%
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Corn 0-5” heightCorn 0-5” height
17.5/150 = 12%
Weed Competitiveness Based on Crop HeightWeed Competitiveness Based on Crop Height
11.4/150 = 7.6%
Corn 6-12” heightCorn 6-12” height
Corn weed free yield = 150 bu/ACorn weed free yield = 150 bu/A
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Soybeans 1st trifoliate; weed free yield = 40 bu/ASoybeans 1st trifoliate; weed free yield = 40 bu/A
Weed Competitiveness Based on Row SpacingWeed Competitiveness Based on Row Spacing
30” Row Spacing30” Row Spacing
7.5” Row Spacing7.5” Row Spacing
12.1/40 = 30%
9.9/40 = 25%
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Corn 0-5”; Weed free yield = 150 bu/ACorn 0-5”; Weed free yield = 150 bu/ACocklebur 2-4”Cocklebur 2-4”
Herbicide Efficacy Based on MoistureHerbicide Efficacy Based on Moisture
Moisture StressedMoisture Stressed
Excellent MoistureExcellent Moisture
77.9%77.9%
% Control
100%100%
% Control
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Corn 0-5”; weed free yield = 150 bu/ACorn 0-5”; weed free yield = 150 bu/ACocklebur 2-4”Cocklebur 2-4”
Cultivation Efficacy Based on MoistureCultivation Efficacy Based on Moisture
Moisture StressedMoisture Stressed
Excellent MoistureExcellent Moisture
72.4 %72.4 %
54.9 %54.9 %
% Control
% Control
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Missouri WeedSOFTMissouri WeedSOFT• Decision Support System• Teaching/Learning Tool• Available in 2002 on CD-Rom
–Initial price $195–Yearly updates will be $35-50
• WeedSOFT website–http://weedsoft.unl.edu
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Missouri WeedSOFTMissouri WeedSOFT• To order:
–Make checks payable to WeedSOFT 2002
–Send to : Bulletins, P.O. Box 830918, Lincoln, NE 68583-0918
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WeedSOFTWeedSOFTA State Specific Decision Support System for Weed
Management