title: [Feasibility of using near-infrared reflectance spectroscopy for the analysis of compositions of straw silage].
abstract: Near-infrared reflectance spectroscopy (NIRS) calibrations of chemical composition in 158 straw silage samples were developed by means of partial least-squares (PLS) regression. Results showed that the correlation coefficients of calibration (R2) were 0.95, 0.90, 0.86, 0.91, 0.86, 0.95 and 0.90 for crude protein, neutral detergent fibre, acid detergent fibre, hemicellulose, dry matter, crude ash and acid detergent lignin respectively; the R2 of pH, lactic acid, acetic acid, propionic acid, butyric acid and ammonia were 0.98, 0.83, 0.85, 0.36, 0.90 and 0.92 respectively. The RPD (SD/SECV) of these parameters were all greater than 2.5 except acetic acid, propionic acid and butyric acid, and the correlation coefficients of validation (Rv(2)) of the parameters were all greater than 0.80 except lactic acid, acetic acid, propionic acid and butyric acid. These results are of great practical importance in rapid evaluation of silage quality.
authors.affiliation: College of Engineering, China Agricultural University, Beijing 100083, China.
authors.forename: Xian
authors.initials: X
authors.lastname: Liu
authors.forename: Lu-jia
authors.initials: LJ
authors.lastname: Han