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Prediction of crude protein and classification of the growth stage of wheat plant samples from NIR spectra

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Fecha de publicación
2004
Autor/a
Gatius Cortiella, Ferran
Lloveras Vilamanyà, Jaume
Ferran i Calderó, Xavier
Puy Llorens, Jaume
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Resumen
Near-infrared spectroscopy (NIRS) was used to analyse the crude protein content of dried and milled samples of wheat and to discriminate samples according to their stage of growth. A calibration set of 72 samples from three growth stages of wheat (tillering, heading and harvest) and a validation set
of 28 samples was collected for this purpose. Principal components analysis (PCA) of the calibration set discriminated groups of samples according to the growth stage of the wheat. Based on these differences, a classification procedure (SIMCA) showed a very accurate classification of the validation set samples : all of them were successfully classified in each group using this procedure when both the residual and the leverage were used in the classification criteria. Looking only at the residuals all the samples were also correctly classified except one of tillering stage that was assigned to both tillering and heading stages. Finally, the determination of the crude protein content of these samples was considered in two ways: building up a global model for all the growth stages, and building up local models for each stage, separately. The best prediction results for crude protein were obtained using a global model for samples in the two first growth stages (tillering and heading), and using a local model for the harvest stage samples.
URI
http://hdl.handle.net/10459.1/3333
DOI
https://doi.org/10.1017/S0021859604004691
Es parte de
Journal of Agricultural Science, 2004, vol. 142, núm. 5, p. 517–524
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