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Agriculturae Conspectus Scientificus, Vol. 81 No. 1, 2016.

Original scientific paper

Prediction of Chemical Composition from Semi-natural Grassland by NIR Spectroscopy

Marina Vranić ; University of Zagreb, Faculty of Agriculture, Department of Field Crops, Forage and Grasses, Svetošimunska cesta 25, 10000 Zagreb, Croatia
Krešimir Bošnjak ; University of Zagreb, Faculty of Agriculture, Department of Field Crops, Forage and Grasses, Svetošimunska cesta 25, 10000 Zagreb, Croatia
Siniša Glavanović ; Belupo Inc., Research and Development, Danica 5, 48000 Koprivnica, Croatia
Marko Vinceković ; University of Zagreb, Faculty of Agriculture, Department of Chemistry, Svetošimunska cesta 25, 10000 Zagreb, Croatia
Dario Jareš ; University of Zagreb, Faculty of Agriculture, Department of Field Crops, Forage and Grasses, Svetošimunska cesta 25, 10000 Zagreb, Croatia
Anamarija Cundić ; Student at the University of Zagreb, Faculty of Agriculture, Svetošimunska cesta 25, 10000 Zagreb, Croatia

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Abstract

The objective of this research was to examine three techniques for prediction of the chemical composition by NIR spectroscopy (1100 – 2500 nm) from semi-natural grassland: modified partial least squares (MPLS) regression; partial least square (PLS) regression and principal component regression (PCR). A spectral data for a total of 150 samples originated from seminatural grassland were used. Standard errors of calibration (SEC) for crude proteins (CP) were 6.52, 4.87 and 6.94 for MPLS, PLS and PCR, while standard errors of cross validation (SECV) were 8.16, 6.13 and 7.56 respectively. SEC for organic matter (OM) were 7.69, 7.61 and 7.37 for MPLS, PLS and PCR, while SECV were 8.08, 8.27 and 7.57 respectively. Higher SEC and SECV were reported for neutral detergent fibre (NDF) and acid detergent fibre (ADF) content than reported for CP and OM content. Hyperspectral analysis by PLS resulted in the highest accuracy for the estimation of crude protein, organic matter and neutral detergent fibre and acid detergent fibre, while MPLS was the best in predicting acid detergent fibre. The greatest accuracy in this research was achieved for CP, then NDF, OM, and finally ADF content. Prediction for NDF, OM, and especially ADF content should be improved in the future by involving specific semi-natural grassland samples.


Keywords

semi-natural grassland; chemical composition; NIR spectroscopy; PLS; MPLS; PCR

Hrčak ID:

168586

URI

https://hrcak.srce.hr/168586

Publication date:

9.11.2016.

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