Iron oxides dynamics in a subtropical Brazilian Paleudult under long-term no-tillage management

Inda, Alberto Vasconcellos; Torrent, J.; Barrón, Vidal; Bayer, Cimélio; Fink, Jessé Rodrigo

doi:10.1590/s0103-90162013000100008

Cited by 38 publications

(26 citation statements)

References 21 publications

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“…For example, sugarcane (Saccharum spp.) management of crop residues (cane) can alter several factors such as soil moisture and the concentration of organic ligands, which are involved in the chemical reduction and chelation of iron oxides (Inda et al, 2013). This further confirms the relationship between iron minerals and CO 2 via its production or release from soil.…”

Section: Introductionsupporting

confidence: 57%

Field-scale spatial correlation between contents of iron oxides and CO2 emission in an Oxisol cultivated with sugarcane

Bahia

Júnior

Panosso

et al. 2015

Sci. agric. (Piracicaba, Braz.)

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ABSTRACT:Soil CO 2 emission (FCO 2 ) is one of the main sources of carbon release into the atmosphere. Moreover, FCO 2 is related to soil attributes governing the transfer of gases from soil to the atmosphere. This study aimed firstly to describe the spatial variability of hematite (Hm), goethite (Gt), iron extracted with sodium dithionite-citrate-bicarbonate (Fe d ) contents, soil CO 2 emission (FCO 2 ) and free-water porosity (FWP) and secondly, to develop statistical models to predict the above mentioned factors in an Oxisol cultivated under manual harvesting of sugarcane (Saccharum spp.) in southeastern Brazil. The study was conducted on an irregular 50 m × 50 m grid containing 89 points, each 0.5-10 m apart. The 0-0.1 m soil layer at each sampling point was used to assess soil FCO 2 , moisture and total pore volume. The results were subjected to descriptive statistical and geostatistical analyses using auto-and cross-semivariograms. All soil attributes exhibited a spatial dependence structure and the experimental semivariograms fitted spherical and exponential models. The Gt content was the individual attribute that exhibited the highest linear and spatial correlation, especially with FCO 2 . We were able to use diffuse reflectance spectroscopy to map large areas, which allows for easy identification and estimation of soil attributes such as FCO 2 and FWP. Geostatistical techniques faciltate the interpretation of spatial relationships between soil respiration and the examined properties.

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Section: Introductionsupporting

confidence: 57%

Field-scale spatial correlation between contents of iron oxides and CO2 emission in an Oxisol cultivated with sugarcane

Bahia

Júnior

Panosso

et al. 2015

Sci. agric. (Piracicaba, Braz.)

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“…Quartz was the dominant mineral in the coarse fractions ( Figure 3A, B and C; and 4A, B and C) and characteristic reflections of this mineral were not observed for the clay fraction (Figures 2A, B and C), as found in some soils of southeastern Brazil (Inda et al, 2013;Costa et al, 2014).…”

Section: Mineralogical Compositionmentioning

confidence: 79%

Mineralogy, magnetic susceptibility and geochemistry of Fe-rich Oxisols developed from several parent materials

Camêlo

Ker

Fontes

et al. 2018

Sci. agric. (Piracicaba, Braz.)

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Fe-rich Oxisols on mafic rocks in Brazil generally have high magnetic susceptibility with high contents of some trace elements. These are taxonomically similar soils; however, differences in magnetic and geochemical properties may affect agricultural or environmental usability and subsequent management. This study investigated the pedogenesis of Fe-rich Oxisols from various parent materials and evaluated the lithogenetic influence on magnetic susceptibility and trace elements contents. Soil samples were collected from Bw horizons in 13 Rhodic Oxisols and a Typic Oxisol developed from several parent materials in Minas Gerais State, Brazil. Soils were analyzed by X-ray diffractometry (XRD) and magnetometry. Soil chemical analyses consisted of sulfuric and total (tri-acid) digestions and selective Fe oxides dissolutions and statistical correlations were determined. Fe-rich Oxisols presented a typical mineralogical composition of highly weathered soils with structural stability. The results confirm the difficulty to identify accurately magnetic minerals in different grain sizes using XRD. However, coarse fractions still exert dominant influence on the magnetic properties of the Fe-rich Rhodic Oxisols. In addition, coarse fractions probably contribute to the enrichment of superparamagnetic particles for the clay fraction. Although highly weathered, Fe-rich Oxisols may have their geochemical attributes still controlled by the parent material, where trace elements seem to be correlated with the magnetic minerals in the coarse fractions. Thus, the natural replacement of some trace elements from soil-solution equilibrium reactions during plant development could be more effective in soils with higher magnetic particles concentrations in the coarse fractions.

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“…The positive correlation between Fe p and the OM content of the soil was also reflected in the Fe p /Fe d ratio (Figure 3), showing that in soils with greater OM contents, like soil 3, a considerable proportion of Fe was found bound to the organic fraction. Zanelli et al (2007) and Inda Junior et al (2013) explained that OM, moisture, and microbial activity can change the pedoenvironmental conditions and the dynamics of mineral formation, favoring dissolution and remobilization of Fe oxides. Thus, in soils with high OM content, the Fe tends to remain in less crystalline forms and is associated with organic compounds, since there is less crystallization of the oxides (Schwertmann and Kämpf, 1983).…”

Section: Resultsmentioning

confidence: 99%

Iron Availability in Tropical Soils and Iron Uptake by Plants

Mielki

Novais

Ker

et al. 2016

Rev. Bras. Ciênc. Solo

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Given the increase in crop yields and the expansion of agriculture in low fertility soils, deficiency of micronutrients, such as iron, in plants grown in tropical soils has been observed. The aim of this study was to evaluate Fe availability and Fe uptake by corn (Zea mays L.) plants in 13 different soils, at two depths. Iron was extracted by Mehlich-1, Mehlich-3, and CaCl 2 (Fe-CC) and was fractionated in forms related to low (Fe o ) and high (Fe d ) crystallinity pedogenic oxyhydroxides, and organic matter (Fe p ) using ammonium oxalate, dithionite-citrate, and sodium pyrophosphate, respectively. In order to relate Fe availability to soil properties and plant growth, an experiment was carried out in a semi-hydroponic system in which part of the roots developed in a nutrient solution (without Fe) and part in the soil (the only source of Fe). Forty-five days after seeding, we quantified shoot dry matter and leaf Fe concentration and content. Fe d levels were high, from 5 to 132 g kg -1

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Iron oxides dynamics in a subtropical Brazilian Paleudult under long-term no-tillage management

Cited by 38 publications

References 21 publications

Field-scale spatial correlation between contents of iron oxides and CO2 emission in an Oxisol cultivated with sugarcane

Field-scale spatial correlation between contents of iron oxides and CO2 emission in an Oxisol cultivated with sugarcane

Mineralogy, magnetic susceptibility and geochemistry of Fe-rich Oxisols developed from several parent materials

Iron Availability in Tropical Soils and Iron Uptake by Plants

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