Estimating the nitrogen status of crops using a digital camera

By Yong Li, Deli Chen, C. Walker, J. Angus. 2010

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A Review of Methods for Sensing the Nitrogen Status in Plants: Advantages, Disadvantages and Recent Advances (2013, methodology): “A list of commercial systems based on active sensors, whose use at field scale is reported in recent studies, is presented as follows: (a) the tractor-mounted Yara N-Sensor (Yara International ASA, Oslo, Norway), (b) the hand-held GreenSeeker (NTech Industries Inc., Ukiah, CA, USA), and (c) the hand”
A novel method for the estimation of soybean chlorophyll content using a smartphone and image analysis (2016, methodology): “Among the techniques, digital cameras are widely used together with the segmentation of images and color models (Li et al. 2010) and are becoming a new quantitative tool in agriculture (Riccardi et al. 2014).”