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Rapid determination of nutrient composition and mineral element content of common vetch (Vicia sativa L.) using Near-infrared spectroscopy |
Tao Wang1 
, Li Wang1
, Tao Guo1
, Yanli Shi1
, Baocang Liu2
, Fei Li1,*
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1College of Pastoral Agriculture Science and Technology, Lanzhou University, Lanzhou, China
2Xinjiang Taikun Group Chang Feed Co., LTD , Xinjiang Taikun Group Chang Feed Co., LTD, Changji Hui Autonomous Prefecture , China |
Correspondence:
Fei Li, Tel: +86-18719811767, Fax: none, Email: lfei@lzu.edu.cn
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Received: 11 December 2024 • Revised: 13 January 2025 • Accepted: 27 March 2025 |
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| Abstract |
Objective
This study aims to establish an accurate and reliable near-infrared spectroscopy to enable rapid, efficient, and non-destructive evaluation of the nutritional quality of common vetches across different regions and varieties.
Methods
A total of 190 samples from various regions and varieties were selected for this study, which were divided into a calibration set (4:1 ratio) and validation set. The original spectrum of the calibration set is subjected to 10 different pretreatment techniques in combination with first and second derivatives, while the prediction model was established by combining the measured value of common vetch with the modified partial least squares method (MPLS).
Results
The results indicate that the calibration root-mean-square error (REMSEC) and cross-validation root-mean-square error (REMSECV) values range from 0.01 to 1.25 and 0.01 to 1.37, respectively. The determination coefficients of cross-validation (R2CV) for phosphorus (P), potassium (K), magnesium (Mg), and iron (Fe) are relatively low at 0.82, 0.86, 0.82, and 0.74 respectively; however, all other indicators have R2CV values above 0.90. The predicted root means square errors (RMSEP) for common vetch indexes range from 0.01 to 1.87 with RMSEP values higher than 1.0 observed for crude protein (CP), neutral detergent fiber (NDF), acid detergent fiber (ADF), and ash indices, whereas RMSEP values lower than or equal to 1.0 were obtained for other indicators. The measured coefficient of determination (R2p) demonstrates that the R2p values for each nutrient element and mineral element vary from 0.70 to 0.96. The residual prediction deviation (RPD) values for Mg exhibit relatively low levels, while the RDP values for other indicators exceed 2.0.
Conclusion
These findings suggest that this study provides a viable approach to evaluate the nutritional composition and mineral element content of different varieties and regions of common vetch.
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| Keywords:
Common vetch; Near infrared spectroscopy; Nutritional quality; MPLS; Prediction accuracy |
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