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Developing technology extrapolation
domains for agronomic technology packages
Francis Muthoni
International Institute of Tropical Agriculture (IITA)
Africa RISING ESA Project review and planning meeting
11 – 12 September 2019, Dar es Salaam, Tanzania
Outline
 Example of extrapolation domains for AR technologies
 Data requirements for generating domains
 Overview of proposed work-plan
Why generate extrapolation domains?
 Different SI technology options are suited for specific biophysical
context
 Proper spatial targeting of SI technologies is required to:
 Reduce risk of failure
 Maximize impact
 Increase probability of adoption
 Rationalise investment of limited resources
Example: Extrapolation suitability index (ESI)
ESI for maize fertilizer packages in Tanzania
 Lower ESI value indicates high similarity with conditions in reference
trial sites
 Less risk for extrapolating a particular package of technologies
Muthoni et al 2019, GeoCarto Int., 34(4), 368 - 390
Data requirements from technology trials
 Availability of data from technology validation sites determines the
method & practicality of domains to be generated
 GPS location: Lat., Long., Altitude
 Crop varieties
 Inorganic fertilizers rates : N P rates
 Organic amendments: manure, crop residues
 Soil water conservation practices: Tied ridges, fanya juu/Chini
 Conservation Agri. practices: No tillage, minimum tillage….
 Grain/biomass yields
 Economics: Profitability
Activity 1.3.1.1: Extrapolation domains for CA
technologies
Activity 1.3.1.1: Extrapolation domains for CA
technologies
 A multivariate random Forests (MRF) model will be used to predict
grain yields for maize varieties grown with different CA practices
Hengl et al., 2017
Activity 1.3.1.2: Extrapolation domains for SWC
technologies
Activity 1.1.2.1: Monitoring impact of weather and
climate variability on maize-legume productivity
Activity 1.1.2.1: Monitoring impact of weather and
climate variability on maize-legume productivity
Africa Research in Sustainable Intensification for the Next Generation
africa-rising.net
This presentation is licensed for use under the Creative Commons Attribution 4.0 International Licence.
Thank You

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Developing technology extrapolation domains for agronomic technology packages

  • 1. Developing technology extrapolation domains for agronomic technology packages Francis Muthoni International Institute of Tropical Agriculture (IITA) Africa RISING ESA Project review and planning meeting 11 – 12 September 2019, Dar es Salaam, Tanzania
  • 2. Outline  Example of extrapolation domains for AR technologies  Data requirements for generating domains  Overview of proposed work-plan
  • 3. Why generate extrapolation domains?  Different SI technology options are suited for specific biophysical context  Proper spatial targeting of SI technologies is required to:  Reduce risk of failure  Maximize impact  Increase probability of adoption  Rationalise investment of limited resources
  • 5. ESI for maize fertilizer packages in Tanzania  Lower ESI value indicates high similarity with conditions in reference trial sites  Less risk for extrapolating a particular package of technologies Muthoni et al 2019, GeoCarto Int., 34(4), 368 - 390
  • 6. Data requirements from technology trials  Availability of data from technology validation sites determines the method & practicality of domains to be generated  GPS location: Lat., Long., Altitude  Crop varieties  Inorganic fertilizers rates : N P rates  Organic amendments: manure, crop residues  Soil water conservation practices: Tied ridges, fanya juu/Chini  Conservation Agri. practices: No tillage, minimum tillage….  Grain/biomass yields  Economics: Profitability
  • 7. Activity 1.3.1.1: Extrapolation domains for CA technologies
  • 8. Activity 1.3.1.1: Extrapolation domains for CA technologies  A multivariate random Forests (MRF) model will be used to predict grain yields for maize varieties grown with different CA practices Hengl et al., 2017
  • 9. Activity 1.3.1.2: Extrapolation domains for SWC technologies
  • 10. Activity 1.1.2.1: Monitoring impact of weather and climate variability on maize-legume productivity
  • 11. Activity 1.1.2.1: Monitoring impact of weather and climate variability on maize-legume productivity
  • 12. Africa Research in Sustainable Intensification for the Next Generation africa-rising.net This presentation is licensed for use under the Creative Commons Attribution 4.0 International Licence. Thank You