GRAMPS Beyond Rendering Jeremy Sugerman 11 December 2009 PPL Retreat.
Abe Retreat 2009
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Transcript of Abe Retreat 2009
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Precision Agriculture in Arizona: A New Research and Extension Program
Pedro Andrade-SánchezAgricultural and Biosystems Engineering DepartmentMaricopa Agricultural Center, University of Arizona
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Modern technology for Precision Agriculture
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Presentation Outline
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Variable rate technology in Cotton
Soil Electrical Survey. 20 ha field in Safford, AZ
Veris sensor. Apparent Electrical Conductivity (ECa)
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VRT in Cotton. Prescription Mapping
Soil texture prediction. 20 ha field in Safford, AZ
y = -1.245x + 63.151
R2 = 0.780
0
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0 5 10 15 20 25 30
Apparent Electrical Conductivity (mS/m)
Pe
rce
nt
Sa
nd
Note: Preliminary tests at MAC show potential for salinity assessment
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Detection of subsoil compaction
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CIEi = 0.216 CIi + 2.601 di - 0.176 CIi di
(R2 = 0.973)
0.0
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1.0
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2.0
0.0 0.5 1.0 1.5 2.0
CIE (MPa)
Pre
dic
ted
CIE
(M
Pa
)
CIEi*= 0.216*(2.0 MPa) + 2.601 di - 0.176*(2.0 MPa) di
Mapped quantity: CIEi / CIEi*
Algorithm for compaction assessment
CIEi = Cone Index Equivalent (of the ith layer)
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Draft and Fuel Consumption
Current work: Tractor Instrumentation
From N.E. Boon et al., 2005
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Canopy multi-spectral reflectance
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Effect of defoliation after 4 hours
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40
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0 3 6 9 12 15 18Days after defoliation
NIR
can
op
y re
flec
tan
ce (
%)
Control 25% 50% 75% 100%
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0 3 6 9 12 15 18Days after defoliation
NIR
can
op
y re
flec
tan
ce (
%)
Control 25% 50% 75% 100%
Date 1 (June 20)
Date 2 (July 7) Date 3 (July 21)
40
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0 3 6 9 12 15 18Days after defoliation
NIR
can
op
y re
flec
tan
ce (
%)
Control 25% 50% 75% 100%
Biomass dynamics (NIR band – 880 nm)
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Auto-guidance: Extending infrastructure utilization
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Auto-guidance: Linear distribution of plants
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Auto-guidance: Linear distribution of plants
Easting Error = Ei – Ea-b
Planting w/ Autoguidance Conventional Planting
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Yield monitoring
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0.0
0.5
1.0
1.5
2.0
2.5
3.0
3.5
4.0
3659245 3659255 3659265 3659275 3659285
Northing (m)
Ma
ss
flo
w r
ate
(lb
/se
c)
Yield monitoring: Small plot research
Note: In 2009, yield monitoring using GPS-RTK improved spatial resolution
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Future Work: Variable Rate Irrigation
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Information Loop for Variable Rate Irrigation
Chavez et al. 2007
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Control System for Variable Rate Irrigation
Chavez et al. 2007