Aufsatz
Use of digital camera to assess nitrogen status of winter wheat in the Northern China Plain
Abstract
The most widely used methods to assess the nitrogen (N) status of winter wheat (Triticum aestivum L.) are the determination of plant total N by combustion, the testing of nitrate in the leaf tissue and the use of SPAD readings. However, due to their labor requirements or high costs these methods can hardly be applied to the huge wheat growing areas of the Northern China Plain. This study therefore examined an alternative method to measure the N status of wheat by using a digital camera to record the visible green light reflected from the plant canopy. The experiment was conducted near Beijing in a multi-factorial field trial with three levels of N. The intensity of green light reflected from the wheat canopy was compared to the total N concentration, to the nitrate concentration of the basal stem, and to the SPAD readings of leaves. The results show significant inverse relationships between greenness intensity, canopy total N, and SPAD readings at booting and flowering. At booting, sap nitrate <2000mgL^-1 was inversely related to greenness intensity and to sap nitrate concentration in the basal stem. At sap nitrate ~2000mgL^-1, the greenness intensity reached a plateau. At booting and flowering, significant inverse relationships between greenness intensity and shoot biomass were found. The results show the potential of the new method to assess the N status of winter wheat.
Citation
In: Journal of plant nutrition. New York : Dekker. 27.2004, H. 3, S. 441-450Collections
Publikationen (Fachgebiet Ökologischer Pflanzenbau und Agrarökosystemforschung in den Tropen und Subtropen)Citation
@article{urn:nbn:de:hebis:34-2007051518229,
author={Jia, Liangliang and Chen, Xinping and Zhang, Fusuo and Bürkert, Andreas and Römheld, Volker},
title={Use of digital camera to assess nitrogen status of winter wheat in the Northern China Plain},
year={2004}
}
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2007-05-15T13:31:57Z 2007-05-15T13:31:57Z 2004 0190-4167 1532-4087 urn:nbn:de:hebis:34-2007051518229 http://hdl.handle.net/123456789/2007051518229 529188 bytes application/pdf eng Urheberrechtlich geschützt https://rightsstatements.org/page/InC/1.0/ Greenness intensity Nondestructive measurements Photography 630 Use of digital camera to assess nitrogen status of winter wheat in the Northern China Plain Aufsatz The most widely used methods to assess the nitrogen (N) status of winter wheat (Triticum aestivum L.) are the determination of plant total N by combustion, the testing of nitrate in the leaf tissue and the use of SPAD readings. However, due to their labor requirements or high costs these methods can hardly be applied to the huge wheat growing areas of the Northern China Plain. This study therefore examined an alternative method to measure the N status of wheat by using a digital camera to record the visible green light reflected from the plant canopy. The experiment was conducted near Beijing in a multi-factorial field trial with three levels of N. The intensity of green light reflected from the wheat canopy was compared to the total N concentration, to the nitrate concentration of the basal stem, and to the SPAD readings of leaves. The results show significant inverse relationships between greenness intensity, canopy total N, and SPAD readings at booting and flowering. At booting, sap nitrate <2000mgL^-1 was inversely related to greenness intensity and to sap nitrate concentration in the basal stem. At sap nitrate ~2000mgL^-1, the greenness intensity reached a plateau. At booting and flowering, significant inverse relationships between greenness intensity and shoot biomass were found. The results show the potential of the new method to assess the N status of winter wheat. open access In: Journal of plant nutrition. New York : Dekker. 27.2004, H. 3, S. 441-450 Jia, Liangliang Chen, Xinping Zhang, Fusuo Bürkert, Andreas Römheld, Volker The original publication is available at www.dekker.com
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