Lacer-induced Chlorophyll Fluorescence - a Tool for Online Detecting Nitrogen Status in Crop Stands
Sticksel, E. and Maidl, F.-X. and Schächtl, J. and Huber, G. and Schulz, J. (2001) Lacer-induced Chlorophyll Fluorescence - a Tool for Online Detecting Nitrogen Status in Crop Stands. In: 3rd ECPA Proceedings, pp. 959-964. 3rd European Conference on Precision Agriculture, Montpellier.
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The on-line monitoring of crop stands is essential in a system of site specific N application. The chlorophyll fluorescence ratio F685/F730 is correlated with chlorophyll content and nitrogen content. Therefore monitoring the laser-induced chlorophyll fluorescence might be used to assess the N status of plants. During the 2000 growing period field campaigns were done with a hand held device to measure the fluorescence ratio F685/F730. Fluorescence ratio was negative correlated with N content and in late growth stages with N uptake as well. The coefficient of correlation was between r=0.976 (N content in dry matter in EC 30 against fluorescence ratio) and r=0.737 (N uptake in EC 37 against fluorescence ratio). The experiences of the 2000 measuring campaign will be applied for the further improvement of the technical design.
|Document Type:||Conference or Workshop Item (Paper)|
|Title:||Lacer-induced Chlorophyll Fluorescence - a Tool for Online Detecting Nitrogen Status in Crop Stands|
|Journal or Publication Title:||3rd ECPA Proceedings|
|Page Range:||pp. 959-964|
|Event Title:||3rd European Conference on Precision Agriculture, Montpellier|
|Organizer:||European Conference on Precision Agriculture|
|HGF - Research field:||Aeronautics, Space and Transport|
|HGF - Program:||Space|
|HGF - Program Themes:||W EO - Erdbeobachtung|
|DLR - Research area:||Space|
|DLR - Program:||W EO - Erdbeobachtung|
|DLR - Research theme (Project):||UNSPECIFIED|
|Institutes and Institutions:||Remote Sensing Technology Institute|
|Deposited By:||Cornelia Roehl|
|Deposited On:||16 Sep 2005|
|Last Modified:||06 Jan 2010 22:04|
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