Prediction of Phosphorus Sorption Index and Availability by NIR and MIR in Soils in Madagascar

Henintsoa V. Ramaroson, Thierry Becquer (), Hery Razafimahatratra, Ando Razakavololona, Lilia Rabeharisoa and Amos F. M. Rakotondrazafy
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Henintsoa V. Ramaroson: Ecole Normale Supérieure d’Ampefiloha, Université d’Antananarivo, Antananarivo 101, Madagascar
Thierry Becquer: Eco&Sols, IRD, INRAE, CIRAD, L’Institut Agro Montpellier, Université Montpellier, 34060 Montpellier, France
Hery Razafimahatratra: Laboratoire des RadioIsotopes, Université d’Antananarivo, Route d’Andraisoro, Antananarivo 101, Madagascar
Ando Razakavololona: Ecole Normale Supérieure d’Ampefiloha, Université d’Antananarivo, Antananarivo 101, Madagascar
Lilia Rabeharisoa: Laboratoire des RadioIsotopes, Université d’Antananarivo, Route d’Andraisoro, Antananarivo 101, Madagascar
Amos F. M. Rakotondrazafy: Faculté des Sciences, Université d’Antananarivo, Antananarivo 101, Madagascar

Land, 2023, vol. 12, issue 1, 1-14

Abstract: The development of techniques for the rapid, inexpensive, and accurate determination of the phosphorus (P) availability and sorption index (PSI) in soils is important for P management in highly weathered tropical soils. The applicability of near- and mid-infrared reflectance spectroscopy (NIR and MIR) as tools for estimating P availability and PSI was assessed over a wide range of highly weathered soils in Madagascar. The predictions were based on chemometric methods using multivariate calibration models with partial least squares (PLS) regressions, and pedotransfer functions (PTFs). Chemometric methods failed to predict available P (P resin ). However, a P sorption index, determined as the P remaining in solution (P rem ), was estimated with acceptable accuracy with both NIR and MIR (R 2 cv = 0.70 − 0.73; R 2 v = 0.65 − 0.77; SEP(c) = 5.5 − 4.6 mg kg −1 ). The PTFs showed that the PSI was well explained by iron oxide, gibbsite, and sand contents, all of these compounds being well predicted by NIR or MIR (R 2 v > 0.70). These results indicate that NIR and MIR can be helpful for a rapid estimate of PSI of highly weathered ferralitic soils.

Keywords: diffuse reflectance spectroscopy; chemometrics; pedotransfer functions; phosphorus sorption; soil mineral composition; highly weathered tropical soils (search for similar items in EconPapers)
JEL-codes: Q15 Q2 Q24 Q28 Q5 R14 R52 (search for similar items in EconPapers)
Date: 2023
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