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Title

Potential use of visible and near infrared reflectance spectroscopy for the estimation of nitrogen fractions in forages harvested from permanent meadows

AuthorsValdés, Carmen ; Andrés, Sonia ; Giráldez, Francisco Javier ; García, R.; Calleja, Alfredo
KeywordsCornell Net Carbohydrate and Protein System (CNCPS)
Herbage
NIRS
Protein value
Issue Date2006
PublisherJohn Wiley & Sons
CitationJournal of the Science of Food and Agriculture 86 (2): 308-314 (2006)
AbstractOne-hundred and ninety-two herbage samples from permanent meadows located in the mountains of Leon (NW Spain) were analyzed for total nitrogen (total N), nitrogen in trichloroacetic acid precipitated matter (TCAN), borate-phosphate buffer insoluble nitrogen (BPBN), neutral-detergent insoluble nitrogen (NDIN) and acid-detergent insoluble nitrogen (ADIN). These data were used to calculate the partition of nitrogen fractions proposed by the Cornell Net Carbohydrate and Protein System (CNCPS): A (total. N - TCAN), B, (TCAN - BPBN), B-2 (BPBN - NDIN), B-3 (NDIN - ADIN) and C (ADIN). Near-infrared reflectance spectroscopy (NIRS) technology accurately predicted total N, TCAN and NDIN, as judged by coefficient of determination (R-2) and ratio performance deviation (RPD) values greater than 0.90 and 2.5, respectively. The rest of the insoluble N fractions (BPBN and ADIN) were predicted with less accuracy by NIRS. Estimations of CNCPS N fractions (A, B-1, B-2, B-3 and C) using visible-NIR spectra of forage samples did not allow accurate predictions (R-2 < 0.90; RPD < 2.5).
Description7 pages, 3 tables.
Publisher version (URL)http://dx.doi.org/10.1002/jsfa.2309
URIhttp://hdl.handle.net/10261/26282
DOI10.1002/jsfa.2309
ISSN0022-5142
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