Discrimination between nitrogen deficiency and fungal infection of winter wheat by laser induced fluorescence

I. Tartachnyk; I. Rademacher; W. KÃ¼hbauch

Discrimination between nitrogen deficiency and fungal infection of winter wheat by laser induced fluorescence

In: Precision Agriculture â05

Authors:

I. Tartachnyk

I. Tartachnyk Institut fÃ¼r Allgemeinen Pflanzenbau, Rheinische Friedrich-Wilhelms-UniversitÃ¤t, Katzenburgweg 5, D-53115 Bonn, Germany

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I. Rademacher

I. Rademacher Institut fÃ¼r Allgemeinen Pflanzenbau, Rheinische Friedrich-Wilhelms-UniversitÃ¤t, Katzenburgweg 5, D-53115 Bonn, Germany

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, and

W. KÃ¼hbauch

W. KÃ¼hbauch Institut fÃ¼r Allgemeinen Pflanzenbau, Rheinische Friedrich-Wilhelms-UniversitÃ¤t, Katzenburgweg 5, D-53115 Bonn, Germany

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Type:: Chapter

Pages:: 63â72

DOI:: https://doi.org/10.3920/978-90-8686-549-9_008

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One of the most important tasks in precision farming is site-specific application of fertilisers and plant protection means. For such site-specific crop management, effective remote sensing methods for detecting crop diseases and nutrient deficiencies are required. In this study, the effects of nitrogen deficiency, pathogen infection and their combined effect on the fluorescence parameters of winter wheat plants were compared. Both types of stress resulted in increase of the ratio of fluorescence intensity at 690 nm and 740 nm (F690/F740) with reduction of chlorophyll content to approximately 35 Î¼g cm^-2. There was a large variability in spectral parameters for pathogen-infected leaves. Nitrogen-deficient plants showed, in contrast, more uniform spectral parameters. The simultaneous scanning mode measurement of laser induced fluorescence and laser light reflection characteristics with parallel estimation of their heterogeneity is proposed for discriminating nitrogen deficiency from pathogen infection under field conditions.

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Precision Agriculture â05

E-Book ISBN:: 9789086865499

Publisher:: Wageningen Academic

Print Publication Date:: 24 Oct 2005

Subjects
- Life Sciences
  - General
  - Agriculture & Environment

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Discrimination between nitrogen deficiency and fungal infection of winter wheat by laser induced fluorescence

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