Can fluorescence based sensing detect nitrogen variability at early growth stages of maize?

L. Longchamps; R. Khosla; D.G Westfall

Can fluorescence based sensing detect nitrogen variability at early growth stages of maize?

In: Precision agriculture '13

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L. Longchamps

L. Longchamps Colorado State University, Soil and Crop Department, Fort Collins, CO 80523-1170, USA; louis.longchamps@colostate.edu

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R. Khosla

R. Khosla Colorado State University, Soil and Crop Department, Fort Collins, CO 80523-1170, USA; louis.longchamps@colostate.edu

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D.G Westfall

D.G Westfall Colorado State University, Soil and Crop Department, Fort Collins, CO 80523-1170, USA; louis.longchamps@colostate.edu

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Type:: Chapter

Pages:: 381–388

DOI:: https://doi.org/10.3920/9789086867783_048

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Early detection of nitrogen (N) variability is essential to site-specific N management for practical and physiological reasons. Current proximal sensing techniques based on reflectance do not reliably detect N variability prior to V8 growth stage of maize. Another technique based on fluorescence also offers the possibility to detect N variability. This study assessed the possibility to detect N variability in maize before V8 growth stage. An experiment was conducted in a greenhouse environment using four nitrogen rates from 0 to 225 kg/ha N equivalent. The Multiplex3^® sensor was used to measure the nitrogen balance index (far-red fluorescence induced by UV divided by red fluorescence induced by either red or green light) from V4 to V8 growth stages of maize. The results obtained indicate that fluorescence sensing provides an indication of maize N variability from V5 growth stage of maize when using red excitation index.

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Precision agriculture '13

E-Book ISBN:: 9789086867783

Publisher:: Wageningen Academic

Print Publication Date:: 01 Nov 2013

Subjects
- Life Sciences
  - General
  - Agriculture & Environment

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Can fluorescence based sensing detect nitrogen variability at early growth stages of maize?

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Precision agriculture '13

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