01 February 2017

High Throughput Field Phenotyping Multi-sensor System

Apogee Instruments' SI-131 Infrared Radiometer (referred to in reference as thermal infrared radiometer, TIR) was selected to be part of a multi-sensor high throughput field phenotyping system for soybean and wheat breeding. The infrared radiometer was used to collect canopy temperature, one of six crop canopy sensor based traits being studied. Temperature, along with the remaining five sensor based traits: canopy height, two NDVI indices, reflectance, and RGB were studied to find a correlation with final yield.

Field phenotyping system platform feature Apogee Instruments' infrared radiometer

Field phenotyping system platform featuring Apogee Instruments' infrared radiometer.

The system consisted of a manually operated platform using a laptop with a special developed LabVIEW program as a controlling unit to collect, synchronize, and store measurements from all sensors for analysis. Apogee's SI-131 was mounted to a sensor bar on the platform at a distance that allowed for a representative subarea of the crop canopy to be seen in the sensor's field of view. The analog infrared radiometer was connected to the laptop through a USB data acquisition board. The LabVIEW program read the infrared radiometer outputs from the analog input ports and applied Apogee's calibration equation to convert the sensor voltage to degrees Celsius. Yufeng Ge, a Biological Systems Engineer from the study said, "The infrared radiometer by Apogee Instruments is among one of the most reliable and trustworthy sensors I have used."

Field phenotyping system platform feature Apogee Instruments' infrared radiometer

Sensors that were mounted to the sensor bar of the platform.

The system was successfully tested over 240 plots of wheat and 120 plots of soybean crop using a manual stop-measure-go data collection method.* The study determined that final grain yield of soybean is strongly correlated with all six sensor base traits, and suggested the usefulness of the sensor system in plant breeding.

Read the Full Article >

*A stop-measure-go data collection method was used because slow response times from sensors did not allow for continuous measurement (the SI-131 with a response time of 0.6 seconds was noted as one of these sensors in the reference article). Since this study took place Apogee has developed  high speed, analog infrared radiometers with a response time of 0.2 seconds and SDI-12 infrared radiometers...more information >

Application Summary


Summary
Apogee Instruments' infrared radiometer is used to measure canopy temperature on a multi-sensor system for high throughput field phenotyping in soybean and wheat breeding.

Apogee Sensors Used
SI-131 Infrared Radiometer

Organization
University of Nebraska-Lincoln

Location
Lincoln, Nebraska

Reference Article
A multi-sensor system for high throughput field phenotyping in soybean and wheat breeding

"The Infrared Radiometer by Apogee is among one of the most reliable and trustworthy sensors I have used."
-Yufeng Ge
  Biological Systems Engineer
 University of Nebraska-Lincoln

18 January 2017

Reflectance Measurements in Cotton Fields

Dr. Glen Ritchie of the University of Georgia has used model PS-100 spectroradiometer to take reflectance measurements in cotton fields and estimate defoliation. Chlorophyll gives plant leaves a reflectance spectrum characteristically different from that of soil. Reflectance measurements can be reported in µmol m-2 s-1, W m-2, or as a relative value.

View poster presented at ASA meeting.


Spectroradiometer used for reflectance measurement

Application Summary


Summary
Estimating defoliation of cotton using reflectance data.

Sensors Used
PS-100 Spectroradiometer

Organization
University of Georgia

Location
Georgia

Original Article
Ritchie, G.L. and C.W. Bednarz. 2005. Estimating defoliation of two distinct cotton types using reflectance data. J. Cotton Sci. 9:182-188.

Poster from ASA meeting 2006

12 January 2017

Irrigation Study

Dr. Joan Girona of the Institute of Agroalimentary Research and Technology in Catalonia, Spain, is studying irrigation and the water and nutrient needs of fruit trees.

He needed to capture pyranometer readings throughout his orchard. Dr. Girona mounted Apogee pyranometer sensors and Campbell Scientific dataloggers on a carefully laid out model train track around the orchard. The train carrying the pyranometer sensors and dataloggers wound around the track and could take measurements at specified intervals. Dr. Girona could then take thousands of measurements. His system was so effective he plans to continue running it for more experiments in the future.

Learn more about Dr. Girona’s experiment by reading the original article on Campbell Scientifics’ website.

Apogee silicon-cell pyranometer used in irrigation study

Application Summary


Summary
Pyranometer mounted on model train to collect measurements in orchard for irrigation study.

Sensors Used
Silicon-cell Pyranometer

Organization
Institute of Agroalimentary Research and Technology

Location
Catalonia, Spain

Original Article
Spain: Irrigation and Solar Radiation - Campbell Scientific

06 January 2017

Controlling Flowering of Orchids in Greenhouse

Dr. Erik Runkle of Michigan State University used the SQ-313 line quantum sensor mounted on a cross bar (as shown below) in greenhouse experiments controlling the flowering of Phalaenopsis Orchids. In the experiment the SQ-313 was used to measure photosynthetic photon flux and the daily light integral at plant height for both natural and electric light sources, while temperature was experimented with to control flowering.

For the complete journal article of the experiment, click here.

Apogee line quantum used in greenhouse

Application Summary


Summary
Line quantum used to measure PPFD and daily light integral, while experimenting with temperature to control flowering of Phalaenopsis Orchids.

Sensors Used
SQ-313 Line Quantum Sensor

Organization
Michigan State University

Location
Lansing, MI

Original Article
Temperature during the day, but not during the night, controls flowering of Phalaenopsis Orchids