SlideTest
19
Precision Agriculture in rizona: A New Research and Extension rogram Pedro Andrade-Sánchez Agricultural and Biosystems Engineering Department Maricopa Agricultural Center, University of Arizona
description
Transcript of SlideTest
Precision Agriculture in Arizona: A New Research and Extension Program
Pedro Andrade-SánchezAgricultural and Biosystems Engineering DepartmentMaricopa Agricultural Center, University of Arizona
Modern technology for Precision Agriculture
Presentation Outline
Variable rate technology in Cotton
Soil Electrical Survey. 20 ha field in Safford, AZ
Veris sensor. Apparent Electrical Conductivity (ECa)
VRT in Cotton. Prescription Mapping
Soil texture prediction. 20 ha field in Safford, AZ
y = -1.245x + 63.151
R2 = 0.780
0
10
20
30
40
50
60
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
Detection of subsoil compaction
CIEi = 0.216 CIi + 2.601 di - 0.176 CIi di
(R2 = 0.973)
0.0
0.5
1.0
1.5
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)
Draft and Fuel Consumption
Current work: Tractor Instrumentation
From N.E. Boon et al., 2005
Canopy multi-spectral reflectance
Effect of defoliation after 4 hours
40
45
50
55
60
65
70
75
0 3 6 9 12 15 18Days after defoliation
NIR
can
op
y re
flec
tan
ce (
%)
Control 25% 50% 75% 100%
40
45
50
55
60
65
70
75
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
45
50
55
60
65
70
75
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)
Auto-guidance: Extending infrastructure utilization
Auto-guidance: Linear distribution of plants
Auto-guidance: Linear distribution of plants
Easting Error = Ei – Ea-b
Planting w/ Autoguidance Conventional Planting
Yield monitoring
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
Future Work: Variable Rate Irrigation
Information Loop for Variable Rate Irrigation
Chavez et al. 2007
Control System for Variable Rate Irrigation
Chavez et al. 2007
![InverseAnalysisforModellingReduced-Scale LaboratorySlopes · Simulatingaflow-slidetest 187 FIGURE10.1:Experimentresults:failureandpost-failurestages(after[92]). 10.2.1 Calibrationoftheconstitutivemodelbyinverseanal-](https://static.fdocuments.in/doc/165x107/5fd6f6e775b336067e6a446e/inverseanalysisformodellingreduced-scale-laboratoryslopes-simulatingaiow-slidetest.jpg)
