Assessment of nitrogen status in wheat using aerial photography

Nontraditional technologies like aerial photography could be an interesting alternative for monitoring wheat nutritional status during the growing season. The objectives of this study were to determine the effect of nitrogen (N) rates and landscape position on the spectral indices obtained with colo...

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Bibliographic Details
Published in:Communications in soil science and plant analysis 2005-01, Vol.36 (13-14), p.1787-1798
Main Authors: Zubillaga, M, Urricariet, S
Format: Article
Language:English
Subjects:
aerial photography
Agronomy. Soil science and plant productions
Biological and medical sciences
crop reflectance
cultivars
developmental stages
fertilizer rates
Fundamental and applied biological sciences. Psychology
grain yield
landscape position
nitrogen content
nitrogen fertilizers
nitrogen nutrition index
nitrogen rates
plant nutrition
reflectance
spectral analysis
Triticum aestivum
wheat
wheat crop
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Summary:Nontraditional technologies like aerial photography could be an interesting alternative for monitoring wheat nutritional status during the growing season. The objectives of this study were to determine the effect of nitrogen (N) rates and landscape position on the spectral indices obtained with color and color infrared aerial photographs and their relationships with N in a wheat crop. The experiment was conducted in the central western Pampas (35 degrees 27'S; 60 degrees 53'W) on two soils located in the same field. Nitrogen treatments were 0, 45, 85, and 125 kg N ha(-1) (N0, N45, N85, and N125) on two landscape positions in a field: upper land (U) and lower land (L). The N rate affected aboveground biomass, leaf area, N concentration, and chlorophyll at final tillering (GS 30) and grain filling (GS 73) stages, which indicated an improvement in crop N nutrition status proportional to the rate of fertilizer. The visible wavelength (red, green, and blue) reflectance decreased as N rate increased. Red digital counts (R) were better correlated with N concentration (r=0.75, p
ISSN:0010-3624
1532-2416
DOI:10.1081/CSS-200062446