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Sensors 2010, 10(4), 2843-2850; doi:10.3390/s100402843

Active Ground Optical Remote Sensing for Improved Monitoring of Seedling Stress in Nurseries

1
Geospatial Laboratory for Environmental Dynamics, University of Idaho, PO Box 441133, Moscow, ID 83844-1133, USA
2
Center for Forest Nursery and Seedling Research, University of Idaho, PO Box 441133, Moscow, ID 83844-1133, USA
3
Columbia Plateau Conservation Research Center, PO Box 370, Pendleton, OR 97801, USA
*
Author to whom correspondence should be addressed.
Received: 5 February 2010 / Revised: 11 March 2010 / Accepted: 24 March 2010 / Published: 29 March 2010
(This article belongs to the Section Remote Sensors)
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Abstract

Active ground optical remote sensing (AGORS) devices mounted on overhead irrigation booms could help to improve seedling quality by autonomously monitoring seedling stress. In contrast to traditionally used passive optical sensors, AGORS devices operate independently of ambient light conditions and do not require spectral reference readings. Besides measuring red (590–670 nm) and near-infrared (>760 nm) reflectance AGORS devices have recently become available that also measure red-edge (730 nm) reflectance. We tested the hypothesis that the additional availability of red-edge reflectance information would improve AGORS of plant stress induced chlorophyll breakdown in Scots pine (Pinus sylvestris). Our results showed that the availability of red-edge reflectance information improved AGORS estimates of stress induced variation in chlorophyll concentration (r2 > 0.73, RMSE < 1.69) when compared to those without (r2 = 0.57, RMSE = 2.11).
Keywords: chlorophyll a+b concentration (Chlab); Scots pine (Pinus sylvestris); red-edge; NDRE; NDVI; CCCI; crop sensors chlorophyll a+b concentration (Chlab); Scots pine (Pinus sylvestris); red-edge; NDRE; NDVI; CCCI; crop sensors
This is an open access article distributed under the Creative Commons Attribution License (CC BY 3.0).

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MDPI and ACS Style

Eitel, J.U.H.; Keefe, R.F.; Long, D.S.; Davis, A.S.; Vierling, L.A. Active Ground Optical Remote Sensing for Improved Monitoring of Seedling Stress in Nurseries. Sensors 2010, 10, 2843-2850.

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