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Prediction of the nutrient content of botanical fractions from annual legumes by near‐infrared reflectance spectroscopy
Author(s) -
STIMSON C.,
KELLAWAY R. C.,
TASSELL R. J.,
ISON R. L.
Publication year - 1991
Publication title -
grass and forage science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.716
H-Index - 56
eISSN - 1365-2494
pISSN - 0142-5242
DOI - 10.1111/j.1365-2494.1991.tb02211.x
Subject(s) - near infrared reflectance spectroscopy , dry matter , organic matter , chemical composition , lignin , reflectivity , cultivar , calibration , composition (language) , chemistry , fraction (chemistry) , near infrared spectroscopy , agronomy , botany , mathematics , biology , chromatography , physics , linguistics , statistics , organic chemistry , optics , philosophy , neuroscience
Abstract Procedures used to determine chemical composition and digestible organic matter in dry matter (DOMD) are slow and expensive. The possibility of using near‐infrared reflectance spectroscopy (NIRS) as an alternative procedure was investigated with annual legumes. Material from cultivars of Medicago murex, Trifolium balansae, T. resupinatum and T. subterraneum was harvested soon after plants had matured. Samples were sorted into stem, leaf and burr fractions and analysed chemically and by NIRS. Data were then sorted into two similar sets, one of which was for calibration and the other for validation. Data for each chemical fraction, in samples used for calibration, were regressed sequentially against the corresponding reflectance spectral data, the log of there reciprocal of which was transformed to first or second derivatives. Equations of best fit were then used to predict the composition of samples in the validation set. Standard errors of calibration and validation respectively, expressed as percentages of the mean, were 0·5 and 0·6 for dry matter (DM), 2·0 and 2·6 for organic matter (OM), 4·8 and 4·3 for DOMD, 6·0 and 7·2 for crude protein, 4·1 and 4·4 for acid‐detergent fibre (ADF), 2·5 and 3·1 for neutral‐detergent fibre (NDF) and 8·9 and 10·9 for lignin.