Abstract

BOTERO HERRERA, Juan Manuel; PARRA SANCHEZ, Luis Norberto  and  CABRERA TORRES, Kenneth Roy. FOLIAR NUTRITION DETERMINATION LEVEL ON BANANAS BY REFLECTANCE SPECTROMETRY. Rev. Fac. Nac. Agron. Medellín [online]. 2009, vol.62, n.2, pp.5089-5098. ISSN 0304-2847.

In order to generate basic knowledge for development of precision agriculture and to improve response to the needs of generate more information spatial and temporal level, was used the reflectance spectrum of banana leaf samples ground and sieved. The chemometric calibration was performed by PLSR (Partial Least Square Regression), with different pre-treatments spectrum (spectrum crude transformations MSC (Multiplicative Scatter Correction), SNV (Standard Normal Variate), Savitzky and Golay with first and second derivative transformation Log 1 / R, and DOSC (Direct Orthogonal Signal Correction). The calibration was between the leaf tissue concentration of 11 nutrients and the reflectance of the same sample, finding that in all cases the best DOSC pre-treatment was that allowed to build calibration models with errors similar to the reference methods with a low number of latent variables and settings above 80% which is sufficient to suggest this methodology as a practical alternative, economically viable, accurate and quick, the traditional chemical leaf tissue analysis.

Keywords : Spectroscopy; foliar analysis; PLSR; calibration; nutrient concentration.

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