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Evaluation of near infrared spectroscopy (NIRS) for estimating soil organic matter and phosphorous in Mediterranean montado ecosystems
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Orientador(es)
Resumo(s)
The Montado is an agro-silvo-pastoral ecosystem characteristic of the Mediterranean
region. Pasture productivity and, consequently, the possibilities for intensifying livestock production
depend on soil fertility. Soil organic matter (SOM) and phosphorus (P2O5) are two indicators of the
evolution of soil fertility in this ecosystem. However, their conventional analytical determination
by reference laboratory methods is costly, time consuming, and laborious and, thus, does not meet
the needs of current production systems. The aim of this study was to evaluate an alternative
approach to estimate SOM and soil P2O5 based on near infrared spectroscopy (NIRS) combined
with multivariate data analysis. For this purpose, 242 topsoil samples were collected in 2019 in
eleven fields. These samples were subjected to reference laboratory analysis and NIRS analysis.
For NIRS, 165 samples were used during the calibration phase and 77 samples were used during
the external validation phase. The results of this study showed significant correlation between NIRS
calibration models and reference methods for quantification of these soil parameters. The coefficient
of determination (R2, 0.85 for SOM and 0.76 for P2O5) and the residual predictive deviation (RPD,
2.7 for SOM and 2.2 for P2O5) obtained in external validation indicated the potential of NIRS to
estimate SOM and P2O5, which can facilitate farm managers’ decision making in terms of dynamic
management of animal grazing and differential fertilizer application
Descrição
Palavras-chave
spectrometry soil fertility soil organic matter phosphorus precision agriculture
Contexto Educativo
Citação
Serrano, J.; Shahidian, S.; Marques da Silva, J.; Paixão, L.; de Carvalho, M.; Moral, F.; Nogales-Bueno, J.; Teixeira, R.F.M.; Jongen, M.; Domingos, T.; et al. Evaluation of Near Infrared Spectroscopy (NIRS) for Estimating Soil Organic Matter and Phosphorus in Mediterranean Montado Ecosystem. Sustainability 2021, 13, 2734
Editora
MDPI