Crop Protection Online - now also including maize

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Crop Protection Online - now also including maize

• Per Rydahl
• Danish Institute of Agricultural Sciences

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Contents

• Status
• Introduction to model
• Prototypes in maize
• User interfaces

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Status
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Status (1)

• Crops
• 3 spring cereal crops
• 4 winter cereal crops
• spring- and winter oilseed rape
• field pea
• sugar beet

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Status (2)

• Herbicides
• all registered and marketed products
• Weeds
• 75 species
• Subscribers in Denmark
• 1000 farmers
• 300 consultants
• 200 schools, companies etc.
• System export
• Estonia, Latvia, Lithuania, Poland and Norway

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Introduction to model
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Model function

1. assesses the level of weed control needed
2. selects single herbicides and calculates doses
   needed
3. calculates tank-mixtures, optimised for cost or
   TFI
4. strategy-module for multiple treatments

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Step 1 The level of control needed

• Includes aspects on yield, quality and crop
  rotation
• Based on expert knowledge
• Input
• Crop name
• Season
• Expected yield
• Weed name
• Weed density
• Output
• level of control needed on weed biomass,4-6
  weeks after a herbicide application (0-97)

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Step 2 dose-response function1 herbicide, 1 weed
1/4 N 1/2 N 1/1 N 2/1 N
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Step 2 dose-response functionIntegration
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Step 2 dose-response function1 herbicide, 3
weed species
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Step 3 Tankmixtures Additive Dose Model (ADM)
Herbicide A
Herbicide B
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Step 3 Tankmixtures Optimization
Dose Herbicide B
Sp 1
Dose Herbicide A
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Prototypes in maize
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Tasks

• to develop and validate DSS models for weed
  control in maize
• to achieve sufficient and safe control of weeds
• to quantify potentials

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Reuse of components from cereals

• target effect levels
• expert model
• dose/response functions
• weed species (field data)
• weed growth stages (semifield data)
• temperature, relative air humidity and water
  stress (semifield data)
• ADM (semifield data)

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Reuse of components from sugar beet

• strategy
• spray subsequent flushes of emerged weeds
• repeated
• field inspections
• consultations of model
• sprayings, as recommend by model
• dose/response functions
• data from genuine split-applications of single
  herbicides

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Prototypes

• 3 prototypes with 3 levels of aimed efficacy
• 90-version
• 85-version
• 80-version
• questions to answer in field validation tests
• can treatment options be recommended by model?
• is yield and weed control at satisfactory levels?
• can input of herbicides be reduced?

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Efficacy 4-6 weeks after treatment
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Efficacy at harvest (1)
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Efficacy at harvest (2)
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Yields
) No significant differences between treatments
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Treatment Frequency Index (TFI)
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Costs of herbicides
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Conclusions on prototypes in maize

• considerable variation in weed infestations in
  validation test plots
• satisfactory weed control was achieved by all
  prototypes in all tests
• input of herbicides by 85-version and
  80-version
• about 10 reduction of TFI
• about 20 reduction of cost (about 160 DKK/ha)
• slightly revised 80-version will be integrated
  in the official version of CPO in 2006

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User interfaces
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User interface - input www.planteinfo.dk
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User interface - output