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.

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

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.

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

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.

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