2024-03-29T05:18:13Zhttp://digital.csic.es/dspace-oai/requestoai:digital.csic.es:10261/1664422018-06-18T08:55:00Zcom_10261_74com_10261_6col_10261_1209
2018-06-15T12:04:14Z
urn:hdl:10261/166442
Ground and airborne level optical sensors: Is it possible to estimate maize crop N Status?
Gabriel, José Luis
Zarco-Tejada, Pablo J.
Quemada, Miguel
Trabajo 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.).
Adjusting 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.
2018-06-15T12:04:14Z
2018-06-15T12:04:14Z
2014-06
comunicación de congreso
Proceedings of the 18th Nitrogen Workshop - The nitrogen challenge: buildmg a blueprint for nitrogen use efticiency and food secunty: 94-95 (2014)
978-972-8669-56-0
D.L.: 377 322/14
http://hdl.handle.net/10261/166442
eng
Sí
closedAccess
Universidade de Lisboa