Hand-Held GreenSeeker SensorsTrimble Agriculture (Greenseeker order link, Goto "Product")
(SEE Quick Reference Card)
Origins
of the Pocket Sensor 
Bill Gates and Carlos Slim inspect the New Greenseeker sensors at CIMMYT
Order the GreenSeeker Hand Held Sensor via "Farm Works"Field results testing Greenseeker and Greenseeker handheld crop sensors, Cali Colombia, February 2013
Origins
of the Pocket Sensor GreenSeeker Algorithm Files and Documents
CIMMYT Use of GreenSeeker Part A: Concepts and Case Studies
CIMMYT Use of GreenSeeker Part B: User Guide
Comparison of several Greenseeker Sensors, Cali, Colombia, February 2013.
History of the GreenSeeker Sensor (Rutto and Arnall)
GreenSeeker Handheld Sensor Manual (from NTech Industries)
GreenSeeker Handheld PPT presentation
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New 4-Band Active Sensor for combined NDVI and moisture stress detection
Influence of Residue on NDVI in wheat
Yumiko Kanke demonstrates the new Optical NDVI Pocket Sensor developed at Oklahoma State University
GreenSeeker NDVI readings collected at V7, V8, V9, and V10 growth stages in corn, and resultant grain yield (blue diamond)
2007, reenSeeker versus CropCircle Measurements, Missouri (Hackman, Sandner, Gebhardt, Riedel)
Work conducted by Drew Tucker, Kansas State University shows the expanded range of the GreenSeeker sensor in Sorghum when compared to the CropCircle
GreenSeeker versus CropCircle for wet and dry biomass prediction (follow this link)
1.
History of Optical Sensing at Oklahoma State
2.
Increasing NUE with Precision
Agriculture
3. Hand-held GreenSeeker
Sensors Commercially available
4.
Alternative Uses of the Hand-Held Sensor
5.
Analysis of Wet vs
Dry Soil Readings
6. Dirty Lenses from soil and
fertilizer. How does this affect the Sensor?
7.
CIMMYT Hand_Held Sensor Project, Erna Lukina, 1999
Does
the GreenSeeker Sensor work when the Field of View is Compromised, Dirty
lenses on the GreenSeeker?Day versus Night Readings?
Effect of ground speed on sensor readings collected over 300 feet (bermudagrass pasture) with a range from 0.3 to 0.83 in NDVI (August, 2005, Efaw Experiment Station). As is noted, a higher frequency of data is collected at 2 MPH, but the trends are the same (2, 4, and 8 MPH)
N-Tech
Industries, Inc. - Ukiah, CA 95482 - 1-888-728-2436
Hand-held
GreenSeeker Sensors have now been adapted to include an EXCEL program
whereby FIELD SCALE fertilizer N rates can be determined by
Crop Consultants.
This program is available in Spanish and English and is being tested in
Mexico, Ecuador, and Oklahoma.Current programs have been adapted for Winter Wheat and Spring Wheat and will soon be available for corn and bermudagrass pasture.
GreenSeeker Evolution, electronics
The graph above plots NDVI readings taken from 0.4m2 plots during the day (wheat, Feekes 4 and Feekes 5) versus the same plots where NDVI readings were taken at night.
The most recent configuration of the hand-held Greenseeker Sensor currently sold by N-Tech Industries.
Ph.D. Candidate, Kyle Freeman collects by-plant sensor readings from corn near Stillwater, OK.
The hand-held GreenSeeker sensor is equipped with a COMPAQ iPAQ pocket PC and specific software for data collection. The GreenSeeker hand-held is an active sensor, emitting its own light, thus being unaffected by time of day or night, cloud cover, etc. This is the same sensor that is on-board the variable N rate applicator being developed by N-Tech Industries, capable of sensing and treating each 4 square feet in wheat in corn based on yield potential and a response index.
Video of the GreenSeeker Hand-held being used in corn (by-plot data collection)
Correlation of by-corn-plant NDVI readings collected at different times from 100 consecutive plants in 1-row, with NDVI readings collected from the same 100 plants (30 minutes later) Stillwater, OK, 2002
Correlation of by-corn-plant NDVI readings collected at different times from 200 consecutive plants in 1-row, with NDVI readings collected from the same 100 plants, Tlaltizapan, MX, June 2002
