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  • 1. Precision Agriculture in Arizona : A New Research and Extension Program Pedro Andrade-S á nchez Agricultural and Biosystems Engineering Department Maricopa Agricultural Center, University of Arizona
  • 2. Modern technology for Precision Agriculture
  • 3. Presentation Outline
  • 4. Variable rate technology in Cotton Soil Electrical Survey. 20 ha field in Safford, AZ Veris sensor. Apparent Electrical Conductivity (EC a )
  • 5. VRT in Cotton. Prescription Mapping Soil texture prediction. 20 ha field in Safford, AZ Note: Preliminary tests at MAC show potential for salinity assessment
  • 6. Detection of subsoil compaction
  • 7. CIE i = 0.216 CI i + 2.601 d i - 0.176 CI i d i (R 2 = 0.973) CIE i *= 0.216*(2.0 MPa) + 2.601 d i - 0.176*(2.0 MPa) d i Mapped quantity: CIE i / CIE i * Algorithm for compaction assessment CIE i = Cone Index Equivalent (of the ith layer)
  • 8. Draft and Fuel Consumption Current work: Tractor Instrumentation From N.E. Boon et al., 2005
  • 9. Canopy multi-spectral reflectance
  • 10. Effect of defoliation after 4 hours
  • 11. Date 1 (June 20) Date 2 (July 7) Date 3 (July 21) Biomass dynamics (NIR band – 880 nm)
  • 12. Auto-guidance: Extending infrastructure utilization
  • 13. Auto-guidance: Linear distribution of plants
  • 14. Auto-guidance: Linear distribution of plants Easting Error = E i – E a-b Planting w/ Autoguidance Conventional Planting
  • 15. Yield monitoring
  • 16. Yield monitoring: Small plot research Note: In 2009, yield monitoring using GPS-RTK improved spatial resolution
  • 17. Future Work: Variable Rate Irrigation
  • 18. Information Loop for Variable Rate Irrigation Chavez et al. 2007
  • 19. Control System for Variable Rate Irrigation Chavez et al. 2007