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- Publisher
- Springer Journals
- Copyright
- Copyright © 2005 by Springer Science+Business Media, Inc.
- Subject
- Life Sciences; Agriculture; Soil Science & Conservation; Remote Sensing/Photogrammetry; Statistics for Engineering, Physics, Computer Science, Chemistry and Earth Sciences; Atmospheric Sciences
- ISSN
- 1385-2256
- eISSN
- 1573-1618
- DOI
- 10.1007/s11119-004-1031-y
- Publisher site
- See Article on Publisher Site
Abstract
The objective of this study was to assess the suitability of laser-induced chlorophyll fluorescence measurements to detect the nitrogen (N) supply of wheat (Triticum aestivum L.) at canopy level under ambient conditions. In 2002, a plot trial was carried out as a randomised block design. Increasing amounts of N fertiliser were applied to induce variations in the N uptake of the canopies. Different cultivars with varying growth habit and leaf colour were chosen to cover a wide range of canopy characteristics. Biomass was harvested at characteristic growth stages to determine aboveground dry matter yield, N concentration in dry matter and N uptake. Measurements with a hand-held chlorophyll sensor showed a strong correlation between the sensor signal and the N uptake thus indicating that the system is suitable for assessing the nutritional status of the plants. A clear differentiation between the N treatments was evident even at the beginning of stem elongation. The cultivar and the growth stage significantly influenced the sensor signal. Both factors need to be considered when predicting the N uptake of the canopy using laser-induced chlorophyll fluorescence measurements.
Journal
Precision Agriculture – Springer Journals
Published: Jan 16, 2004