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- Title
Characterization of nitrogen and water status in oat leaves using optical sensing approach.
- Authors
Zhao, Baoping; Ma, Bao‐Luo; Hu, Yuegao; Liu, Jinghui
- Abstract
BACKGROUND Optical sensing is a potential tool to estimate plant N status, but soil water deficits may interefere with forming a clear relationship. A greenhouse study was conducted with oat plants treated with three water regimes and four N levels to determine whether optical sensing could be used to estimate leaf N and relative water content (RWC). RESULTS Leaf N was strongly correlated with reflectance at 550 nm and at around 705 nm, and N treatments caused a red-edge peak shift to lower wavelength. The ratio of the first derivative reflectance at 741-696 nm (FDRE) was identified to be a good estimator of leaf N at jointing ( R2 = 0.90) and heading ( R2 = 0.86) stages across water treatments. Leaf N also had a stronger association with the red-edge position (REP) at both stages ( R2 = 0.83 and 0.78), or with the ratio R4 (R760/R550) at jointing ( R2 = 0.88), than with chlorophyll meter (SPAD) readings. Under water stress, the predictive accuracy of leaf N increased with these reflectance indices, but decreased using SPAD readings. CONCLUSION The results indicate that specific reflectance indices of FDRE, REP and R4 may be used for a rapid and non-destructive estimation of oat plant N status over a range of water regimes. © 2014 Her Majesty the Queen in Right of Canada Journal of the Science of Food and Agriculture © 2014 Society of Chemical Industry
- Subjects
COMPOSITION of leaves; OATS; NITROGEN content of plants; PLANT-water relationships; OPTICAL sensors; GREENHOUSE plants
- Publication
Journal of the Science of Food & Agriculture, 2015, Vol 95, Issue 2, p367
- ISSN
0022-5142
- Publication type
Article
- DOI
10.1002/jsfa.6729