Hyperspectral Remote Sensing in Detection of Biotic and Abiotic Stresses in Plants for Precision

43 Pages·2017·28.65 MB·English

Hyperspectral Remote Sensing in Detection of Biotic and
Abiotic Stresses in Plants for Precision Agriculture
Keshav D Singh
(Postdoc);
Christian Nansen (P.I.);
Robert Starnes (Pilot);
Elvira De Lange (Postdoc);
UC Davis, CA
1
Change in Spectral Signature
Agriculture Plants/Trees
Hyperspectral Imaging
Pest Management
Infestation/Disease/Wilt
Pesticides Spray
Biotic/Abiotic Stress
Crops Management/
Vegetation starts Damaging
Precision Agriculture 1
Hyperspectral Imaging (HSI):
Imaging Spectroscopy: Interaction
•  Imaging and Spectroscopy between the electromagnetic
•  Hundreds of narrow spectral radiation and contact material
bands to address subtle
information
Advantages:
•  Non-destructive
•  Low cost
•  Less time
2
Ref: @Basics of Crop Sensing, ANR-1398
Plant-Biotic Interaction:
!  Infestation/Pests
!  Fertilizers/Nutrients
Infestation causes:
•  Bacteria
•  Fungus
•  Virus
•  Insect pests: Whiteflys,
Mealybugs, Aphids,
Spidermites, Nematodes)
Fertilizer/Nutrients:
•  Nitrogen (N)
•  Phosphorus (P)
•  Potassium (K)
3
Ref: @Estación Experimental del Zaidín (CSIC), Spain
Plant-Abiotic Interaction:
•  Drought (water deficit),
•  Excessive watering
(water-logging/flooding),
•  Extreme temperatures
(cold, frost and heat)
•  Salinity (sodicity)
•  Mineral (metal and
metalloid) toxicity
4
Combined biotic
and abiotic
environmental
stress factors:
Healthy Stressed
4
Crop health via Reflectance profiling:
•  Vegetation stress identification and monitoring
•  Detection of crop responses to biotic and abiotic stressors
Healthy Stressed
Healthy
Unhealthy
(high biomass)
(low biomass)
4
Ref: @Basics of Crop Sensing, ANR-1398
Reflectance profiling:
Healthy vs. Unhealthy/Stressed Plants (chlorophyll
content or plant health)
Plants reflect Green light and absorb all other colors (Blue, Red etc.)
5
Processing and Analysis Steps:
Raw HRS Data
Data Calibration
Performance
Hypercube
Preference
Spectral Profile
Bioassay LICOR
(Reflectance)
Nutrition
Analysis
Data Analysis/ Solution
Root Analysis
3
Benchtop Hyperspectral Camera:
Sensor Type: Push-broom line scanning
Spectral bands: 240
Range: 380-1035nm
Spectral resolution: 2.75 nm
Hypercam
Plants
Hypercube
6
Ref: @Nansen Lab., UC Davis