Phosphorus speciation by P-XANES in an Oxisol under long-term no-till cultivation

Antonângelo, João Arthur; Firmano, Ruan Francisco; Zhang, Hailin; Colzato, Marina; Abdala, Dalton Belchior; Carvalho, Hudson Wallace Pereira de; Oliveira, Adílson de; Alleoni, Luís Reynaldo Ferracciú

doi:10.1016/j.geoderma.2020.114580

Cited by 18 publications

(16 citation statements)

References 77 publications

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“…All soil samples exhibit strong spectral features consistent with P-bounded to Fe-(hydr)oxides, especially haematite (P-Hm), Al-(hydr)oxides and phyllosilicates, such as kaolinite (Figure 4). This was expected due to the abundance of Fe-oxides and kaolinite in subtropical Oxisols (Schaefer et al, 2008) and the results are in agreement with studies that stressed the importance of Fe in P chemistry of agricultural soils (Antonangelo et al, 2020;Eriksson et al, 2015;Liu et al, 2014;Rivard et al, 2016).…”

Section: Phosphorus K-edge Xanessupporting

confidence: 90%

“…The low crystallinity degree of Fe-P forms (e.g., P-nc-Fe and P-Fh) showed prominent characteristics in the pre-edge region, as reported by Hesterberg et al (1999), and a featureless post-edge, which can be seen in the P-bounded to ferrihydrite (P-Fh) (Figure 3, red line). The opposite was observed for the reference of P-bounded to kaolinite (P-Kln) that had a pronounced feature around 2170 eV in the post-edge region (Figure 3), corroborating Antonangelo et al (2020).…”

Section: Phosphorus K-edge Xanessupporting

confidence: 76%

“…Therefore, the hypothesis that the species identified as P-nc-Al may be P adsorbed to gibbsite of reduced structural order remains. Antonangelo et al (2020) reported similar results for the P-Hm and P-Fh species. For Antonangelo et al (2020), fitting with P-Fh in Oxisols that do not have Fh identified by X-ray diffraction (XRD) can be associated with P-Hm species with low structural order.…”

Section: Phosphorus K-edge Xanessupporting

confidence: 65%

“…A slight pre-edge feature was observed in all samples (Figure 4), especially in the 5-10 and 10-20 cm soil layers, indicating the association between P and Fe-(hydr)oxides, as reported by Antonangelo et al (2020) and Abdala et al (2015). More specifically, this pre-edge extends from 2148 to 2152 eV in the spectra and is associated to inorganic P forms (Hesterberg et al, 1999).…”

Section: Phosphorus K-edge Xanessupporting

confidence: 58%

“…The mineral species that underwent P adsorption are expected to represent the main minerals that interact expressively with P in the studied soil. A detailed description of the origins of the reference materials and the P adsorption procedure can be found in Antonangelo et al (2020).…”

Section: Phosphorus K-edge Xanes Spectroscopymentioning

confidence: 99%

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Phosphorus speciation and distribution in a variable‐charge Oxisol under no‐till amended with lime and/or phosphogypsum for 18 years

Firmano

Colzato

Alleoni

2021

European J Soil Science

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Long-term management with lime and/or phosphogypsum (PG) can change phosphorus (P) forms across the soil profile. In this study, we used synchrotronbased spectroscopy and sequential chemical fractionation to investigate P chemical species after long-term (18 years) application of amendments in a subtropical Oxisol. The availability of nutrients increased with the combined use of lime and PG and a stratification of attributes was identified due to long-term broadcast applications. X-ray absorption near edge structure (XANES) spectra profiles revealed the predominance of P bounded to haematite (Hm) (48% on average) and also P bound to kaolinite (32% on average) species. Low proportions (16%) of calcium-phosphates in the uppermost soil layer (0-5 cm) were found in the treatment that received high calcium (Ca) inputs by lime and PG broadcast.Few correlations were identified between the proportions of P species obtained by XANES and P fractions operationally defined by sequential chemical fractionation (SF). Our results suggest that P-species bound to kaolinite can store stable P forms, which correlated (p < 0.05) with the residual P fractions obtained by SF, highlighting the importance of kaolinite as a legacy P store in Oxisols. Highlights• Lime and phosphogypsum broadcast under no-till improve soil fertility and P availability.• Labile and moderately labile P fractions were the only ones influenced by lime and/or phosphogypsum.• Proportions among P bounded to Fe-and Al-(hydr)oxides with different structural may be affected by long-term Al-suppressors.• P-species bounded to kaolinite may store stable P forms in Oxisols.

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