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Ground and airborne level optical sensors: Is it possible to estimate maize crop N Status?

AuthorsGabriel, José Luis; Zarco-Tejada, Pablo J. ; Quemada, Miguel
Issue DateJun-2014
PublisherUniversidade de Lisboa
CitationProceedings of the 18th Nitrogen Workshop - The nitrogen challenge: buildmg a blueprint for nitrogen use efticiency and food secunty: 94-95 (2014)
AbstractAdjusting N fertilizer application to crop requirements is a key issue to improve fertilizer efficiency, reducing unnecessary input costs to farmers and N environmental impact. Among the multiple soil and crop tests developed, optical sensors that detect crop N nutritional status may have a large potential to adjust N fertilizer recommendation (Samborski et al. 2009). Optical readings are rapid to take and nondestructive, they can be efficiently processed and combined to obtain indexes or indicators of crop status. However, other physiological stress conditions may interfere with the readings and detection of the best crop nutritional status indicators is not always and easy task. Comparison of different equipments and technologies might help to identify strengths and weakness of the application of optical sensors for N fertilizer recommendation. The aim of this study was to evaluate the potential of various ground-level optical sensors and narrow-band indices obtained from airbome hyperspectral images as tools for maize N fertilizer recommendations. Specific objectives were i) to determine which indices could detect differences in maize plants treated with different N fertilizer rates, and ii) to evaluate its ability to identify Nresponsive from non-responsive sites.
DescriptionTrabajo presentado en el 18th Nitrogen Workshop, celebrado en Lisboa del 30 de junio al 3 de julio de 2014.-- Cordovil C. M. d. S. (Ed.).
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