光谱学与光谱分析 |
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Near-Infrared Reflectance Spectroscopy Analytic Model Established for the IVDMD of Cichorium intybus L. |
HU Chao1, 2, BAI Shi-qie1, 2*, ZHANG Yu1, YAN Jia-jun1, YOU Ming-hong1, LI Da-xu1, BAI Ling1, ZHANG Jin1 |
1. Sichuan Academy of Grassland Science, Chengdu 611731, China 2. Qinghai-Tibet Plateau Research Institute, Southwest University for Nationalities, Chengdu 610041, China |
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Abstract Chicory (Cichorium intybus L.) is a new type of forage grasses of high yield and quality with a great value of popularization and utilization. In vitro dry matter digestibility (IVDMD) is one of the important indicators of the nutritional value of forage evaluation. For the study of establishment of Chicory IVDMD NIRS quantitative analysis model, seventy-two species with different genotypes, different growth stages of 204 chicory samples of aboveground material were collected, and by Fourier transform near-infrared diffuse reflectance spectroscopy, through the use of different regression algorithms, can comparing different spectral ranges and spectral pretreatment methods, eight chicory IVDMD NIRS calibration models were established, and the best calibration model parameters were chosen. Its calibration coefficient of determination (R2cal) and external validation coefficient of determination (R2val) were 0.953 17 and 0.904 55, calibration standard deviation (RMSEC) and predictive standard deviation (RMSEP) was 1.977 99% and 2.008 82%, and the correlation coefficient (r) between predicted values and chemical values was 0.951 08. The results show that using NIRS to determine chicory IVDMD is feasible, and provided a rapid analysis method for the determination IVDMD of chicory.
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Received: 2013-10-09
Accepted: 2014-03-11
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Corresponding Authors:
BAI Shi-qie
E-mail: baishiqie@126.com
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