FT-NIR spectroscopic analysis of nitrogen in cotton leaves

Mark Riley, Loreto C. Cánaves

Research output: Contribution to journalArticle

5 Citations (Scopus)

Abstract

Near-infrared spectroscopy was evaluated as a means to quantify the nitrogen content in fresh cotton leaves (Gossypium hirsutum L. var. Delta Pine 90) subjected to a factorial design experiment of varying nitrogen and water applications. Absorbance spectra were collected in the 10 000-4000 cm-1 (1000-2500 nm) region from fresh cotton leaves over a two month portion of the growing season. Total nitrogen content was quantified by a wet chemistry Kjeldahl method for validation purposes. Partial least-squares regression analysis, using an automated grid search method, selected the spectral region 6041 to 5651 cm-1 (1650-1770 nm) for analysis based on having the lowest standard error of prediction of total nitrogen content. This region includes protein spectral features. Nitrogen predictions resulted in a correlation coefficient of 0.83, and a standard error of prediction of 0.29% for nitrogen levels ranging from 3.1 to 5.2% total nitrogen. This approach has promise for providing rapid plant chemical analyses for cotton crop fertilization management purposes.

Original languageEnglish (US)
Pages (from-to)1484-1489
Number of pages6
JournalApplied Spectroscopy
Volume56
Issue number11
DOIs
StatePublished - Nov 1 2002

Fingerprint

Spectroscopic analysis
cotton
spectroscopic analysis
leaves
Cotton
Nitrogen
nitrogen
Kjeldahl method
predictions
factorial design
fertilization
Near infrared spectroscopy
Chemical plants
crops
Regression analysis
correlation coefficients
Design of experiments
Crops
regression analysis
infrared spectroscopy

Keywords

  • Leaf spectroscopy
  • Near-infrared spectroscopy
  • Nitrogen determination
  • Partial least-squares regression

ASJC Scopus subject areas

  • Spectroscopy
  • Instrumentation

Cite this

FT-NIR spectroscopic analysis of nitrogen in cotton leaves. / Riley, Mark; Cánaves, Loreto C.

In: Applied Spectroscopy, Vol. 56, No. 11, 01.11.2002, p. 1484-1489.

Research output: Contribution to journalArticle

Riley, Mark ; Cánaves, Loreto C. / FT-NIR spectroscopic analysis of nitrogen in cotton leaves. In: Applied Spectroscopy. 2002 ; Vol. 56, No. 11. pp. 1484-1489.
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