Evaluation of Field Application of Portable Near Infrared Reflectance Spectrometer (NIRS) for Quality Evaluation of Italian Ryegrass Silages
2011
Park, H.S., National Institute of Animal Science, RDA, Cheonan, Republic of Korea | Lee, S.H., National Institute of Animal Science, RDA, Cheonan, Republic of Korea | Kim, J.G., National Institute of Animal Science, RDA, Cheonan, Republic of Korea | Choi, K.C., National Institute of Animal Science, RDA, Cheonan, Republic of Korea | Seo, S., National Institute of Animal Science, RDA, Cheonan, Republic of Korea | Kim, W.H., National Institute of Animal Science, RDA, Cheonan, Republic of Korea | Lee, H.W., Korea National Open University, Seoul, Republic of Korea | Lim, Y.C., National Institute of Animal Science, RDA, Cheonan, Republic of Korea
This study evaluated the feasibility of using a portable near infrared reflectance spectrometer working in the 900~1,600 nm range for the measurement of quality-related parameters (moisture, pH, Acid detergent fiber (ADF), Neutral detergent fiber (NDF), Crude protein (CP), lactic acid) in intact silage. The calibration result for the Phazir (handheld, Polychromix) was compared with the result for the Spectrastar (Lab. based, Unity). A total of 67 Italian ryegrass silages were used to build calibration models using different spectral signal pre-treatments and the partial least squares regression (PLS) method. The good calibration statistics in two instruments was obtained for moisture content of Italian ryegrass silages with over R²=0.95. The Phazir spectrometer was less accurate in measuring of ADF, NDF and CP contents. The Spectrastar instrument yielded greater precision for pH and lactic acid content; statistic values were over R²=0.82 and the standard error of calibration (SEC)=0.21% and 0.24%. Thus, the NIR measurement of forage quality in the field by portable NIR analyzers was shown not to be feasible, but additional investigations are required to discern the key instrumental and operational parameters that may influence the portable NIR measurement.
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Эту запись предоставил Korea Agricultural Science Digital Library