Abstract
Based on the spectral characteristics of cotton canopies, a plant nitrogen sensor was designed and fabricated fordetection of nitrogen status in cotton plants. The sensor is an active optical multi-spectral sensing unit. It measures spectralreflectance from a cotton canopy in blue, green, red, and near infrared wavebands with a modulated illumination to the cottoncanopy. The sensor was tested in the laboratory and field, and promising results were obtained. This article describes thedesign, implementation, and testing of the sensor.
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