Mineralogia de um latossolo vermelho distrófico submetido a diferentes manejos por 24 anos

Gonçalves, Daniele Freitas; Leite, Wellington; Brinatti, André Maurício; Saab, Sérgio da Costa; Iarosz, Kelly C.; Mascarenhas, Yvonne P.; Carneiro, Paulo Irajara Borba; Rosa, Jadir Aparecido

doi:10.1590/s0100-06832008000700006

Cited by 12 publications

(2 citation statements)

References 15 publications

(9 reference statements)

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“…A corresponding sample of this pedomaterial was earlier analyzed in the Laboratory of Soil Physics and Environmental Sciences, of the Physics Department at the State University of Ponta Grossa (UEPG). The aim at that time was to evaluate differences in mineralogy [9] and the organic matter composition [10] of samples from agricultural sites under no-tillage system, by comparing them with those under traditional agriculture practices. This soil is particularly rich in iron oxides, specifically hematite and goethite [9], in its mineral fraction.…”

Section: Methodsmentioning

confidence: 99%

Mössbauer analysis of high-energy mechanical-milled sand fraction of a magnetic soil developing on basalt

et al. 2011

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A sample of the coarse sand fraction from the soil material of the Ahorizon (0-0.2 m from the soil surface) of a dusky red magnetic Oxisol was submitted to high-energy mechanical milling for different times. This assay aimed mainly at (a) monitoring the individualization of strongly aggregated mineral particles, and (b) measuring the effect of the milling pressure on the mineralogy changes of the material. These data are also intended to experimentally subside any physical model describing the mechanical behavior of the superficial soil layer that is subjected to intensive machine management, in agriculture fields. Powder X-ray data reveal that some mineralogical phases, notably gibbsite, disappear soon after the first few hours milling. The 298 K-transmission Mössbauer spectrum for the non-milled sand sample shows a qualitatively typical pattern for the sand fraction of basalt derived soils, with magnetically ordered sextets, assignable mainly to hematite and maghemite, and an intense central (super)paramagnetic Fe 3+ doublet. For the milled samples, spectra revealed progressive spectral reduction of the magnetic hyperfine structure, with concomitant increase of relative subspectral areas due to (super)paramagnetic phases, as the milling time increased. This result is consistent with the reduction 10 J.F.M. Borges et al.of measured saturation magnetization, from 4.96(8) J T −1 kg −1 , for the non-milled sample, to 3.26(7) J T −1 kg −1 , for the sample milled for 8 hours.

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Section: Methodsmentioning

confidence: 99%

Mössbauer analysis of high-energy mechanical-milled sand fraction of a magnetic soil developing on basalt

et al. 2011

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“…This soil is formed from Ponta Grossa Formation, with the presence of the following Brazilian Archives of Biology and Technology. Vol.63 no.spe: e20190489, 2020 www.scielo.br/babt minerals: gibbsite, kaolinite, halloysite, montmorillonite, hematite, rutile, anatase, goethite and quartz [28]. The climate of the region is Cfb (humid subtropical, without dry season) according to Koppen's classification [29].…”

Section: Experimental Site and Managementmentioning

confidence: 99%

Selection of Indicators to Discriminate Soil Tillage Systems and to Assess Soil Quality in a Red Latosol

Kazmierczak

Giarola

Riferte

et al. 2020

Braz. arch. biol. technol.

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The soil tillage practiced over a long period of time impacts soil quality. The first step in soil quality assessment is to select which indicators should be used. The objective of this study was to identify the soil attributes that discriminate soil tillage systems and can be used as indicators for soil quality assessments. Sixteen soil physical and chemical attributes were evaluated: macroporosity (MaP), microporosity (MiP), total porosity (TP), bulk density (BD), field-saturated hydraulic conductivity (Kfs), soil resistance to penetration (SRP), pH (H2O), pH (CaCl2), aluminium (Al), calcium (Ca), magnesium (Mg), potassium (K), available phosphorus (P), total organic carbon (TOC), cation exchange capacity (CEC) and base saturation (BS), of a very clayey Red Latosol, cultivated for a long period in no-till (NT), conventional tillage (CT) and minimum tillage (MT). The soil attributes (indicators) were selected using canonical discriminant analysis. MiP, Kfs, pH (CaCl2), Ca, Mg, CEC e BS were the most efficient indicators to discriminate soil tillage systems. In the indicator interpretation step was sustained MiP as the indicator that represents the function of physical stability and support, Kfs as the indicator that represents the function of water relations, BS as the indicator that represents the function of nutrient cycling and pH (CaCl2) as the indicator that represents the function of filtering and buffering. These indicators can be used for future soil quality assessment and monitoring of tillage systems in similar regions and conditions.

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Carbon Depletion by Plowing and its Restoration by No‐Till Cropping Systems in Oxisols of Subtropical and Tropical Agro‐Ecoregions in Brazil

et al. 2013

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The continuous use of plowing for grain production has been the principal cause of soil degradation. This project was formulated on the hypothesis that the intensification of cropping systems by increasing biomass‐C input and its biodiversity under no‐till (NT) drives soil restoration of degraded agro‐ecosystem. The present study conducted at subtropical [Ponta Grossa (PG) site] and tropical regions [Lucas do Rio Verde, MT (LRV) site] in Brazil aimed to (i) assess the impact of the continuous plow‐based conventional tillage (CT) on soil organic carbon (SOC) stock vis‐à‐vis native vegetation (NV) as baseline; (ii) compare SOC balance among CT, NT cropping systems, and NV; and (iii) evaluate the redistribution of SOC stock in soil profile in relation to soil resilience. The continuous CT decreased the SOC stock by 0·58 and 0·67 Mg C ha−1 y−1 in the 0‐ to 20‐cm depth at the PG and LRV sites, respectively, and the rate of SOC sequestration was 0·59 for the PG site and ranged from 0·48 to 1·30 Mg C ha−1 y−1 for the LRV site. The fraction of C input by crop residues converted into SOC stock was ~14·2% at the PG site and ~20·5% at the LRV site. The SOC resilience index ranged from 0·29 to 0·79, and it increased with the increase in the C input among the NT systems and the SOC sequestration rates at the LRV site. These data support the hypothesis that NT cropping systems with high C input have a large potential to reverse the process of soil degradation and SOC decline. Copyright © 2013 John Wiley & Sons, Ltd.

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Mineralogia de um latossolo vermelho distrófico submetido a diferentes manejos por 24 anos

Cited by 12 publications

References 15 publications

Mössbauer analysis of high-energy mechanical-milled sand fraction of a magnetic soil developing on basalt

Mössbauer analysis of high-energy mechanical-milled sand fraction of a magnetic soil developing on basalt

Selection of Indicators to Discriminate Soil Tillage Systems and to Assess Soil Quality in a Red Latosol

Carbon Depletion by Plowing and its Restoration by No‐Till Cropping Systems in Oxisols of Subtropical and Tropical Agro‐Ecoregions in Brazil

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