Physical properties of an Alfisol and no-till soybean yield

Filho, João Tavares; Guimarães, María de Fátima; Curmi, Pierre; Tessier, D.

doi:10.1590/s0100-06832012000100026

Cited by 9 publications

(11 citation statements)

References 22 publications

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“…Thus, after 20 years of continuous use with the same management system, only in NT the BD values (1.58 kg dm -3 ) indicated compaction and could restrict plant root growth and development. This result corresponds with findings of Richart et al (2005), Llanillo et al (2006), Araújo et al (2007), Figueiredo et al (2008) andTavares Filho et al (2012), who reported compaction in NT systems.…”

Section: Evaluation Of the Soil Morphologysupporting

confidence: 92%

“…This effect can be more or less pronounced, according to the management system (Costa et al, 2006;Tavares Filho et al, 2012). In this study, Bd increased in the following order: Co => NTR => PC => CT => NT.…”

Section: Evaluation Of the Soil Morphologymentioning

confidence: 48%

“…The increased density in the NT system in comparison with Co can be most likely ascribed to the soil structuring when exposed to relatively heavy machinery traffic at inadequate moisture conditions (Costa et al, 2006;Figueiredo et al, 2008;Tavares Filho et al, 2012). This increase in Bd is usually offset by an increase in the OM content, Biol.L and soil aggregation (Figueiredo et al, 2008), resulting in better physical conditions than in other management systems .…”

Section: Evaluation Of the Soil Morphologymentioning

confidence: 99%

“…Structural units: general term used to replace aggregates (0-10 cm) and/or clumps (> 10 cm). result in soil pore loss and changes in infiltration rates, water availability, aeration and root penetration in the soil, which affect crop yields and induce erosion (Araújo et al, 2007;Collares et al, 2006;Tavares Filho et al, 2012;Portella et al, 2012;Llanillo et al, 2013).…”

Section: Evaluation Of the Soil Morphologymentioning

confidence: 99%

“…Generally, more intense soil management systems cause major soil structural changes, unlike no-tillage systems, which barely affect the soil structure, because the soil is not disturbed (Carpenedo & Mielniczuk, 1990;Tavares Filho et al, 1999Neves et al, 2003;Calegari et al, 2006;Llanillo et al, 2006;Ralisch et al, 2008;Rós et al, 2014). However, the absence of soil disturbance together with intensified land use exposes the soil to heavy machinery traffic, which alters the soil structural quality and results in increased compaction when moisture conditions are inadequate (Collares et al, 2006;Tavares Filho et al, 2012;Calegari et al, 2013).…”

Section: Introductionmentioning

confidence: 99%

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Structural changes and degradation of Red Latosols under different management systems for 20 years

Filho

Melo

Machado

et al. 2014

Rev. Bras. Ciênc. Solo

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SUMMARYSoils are the foundation of terrestrial ecosystems and their role in food production is fundamental, although physical degradation has been observed in recent years, caused by different cultural practices that modify structures and consequently the functioning of soils. The objective of this study was to evaluate possible structural changes and degradation in an Oxisol under different managements for 20 years: no-tillage cultivation with and without crop rotation, perennial crop and conventional tillage, plus a forested area (reference). Initially, the crop profile was described and subsequently, 10 samples per management system and forest soil were collected to quantify soil organic matter, flocculation degree, bulk density, and macroporosity. The results indicated structural changes down to a soil depth of 50 cm, with predominance of structural units ∆µ ∆µ ∆µ ∆µ ∆µ (intermediate compaction level) under perennial crop and no-tillage crop rotation, and of structural units ∆ ∆ ∆ ∆ ∆ (compacted) under conventional tillage and no-tillage. The soil was increasingly degraded in the increasing order: forest => no-tillage crop rotation => perennial crop => no-tillage without crop rotation => conventional tillage. In all managements, the values of organic matter and macroporosity were always below and bulk density always above those of the reference area (forest) and, under no-tillage crop rotation and perennial crop, the flocculation degree was proportionally equal to that of the reference area.Index terms: crop profile, soil physical properties, organic matter, soil quality. RESUMO: MUDANÇAS ESTRUTURAIS E DEGRADAÇÃO DE ATRIBUTOS DE LATOSSOLO VERMELHO SUBMETIDO A DIFERENTES MANEJOS POR 20 ANOSO solo integra os ecossistemas terrestres e o papel dele na produção de alimentos é essencial, embora nos últimos anos tenha se constatado sua degradação física em razão das diferentes práticas culturais utilizadas que modificam sua estrutura e, consequentemente, seu funcionamento. O objetivo deste trabalho foi avaliar possíveis mudanças estruturais, bem como a degradação de Latossolo Vermelho submetido a diferentes manejos por 20 anos. As avaliações foram realizadas em diferentes manejos: semeadura direta com e sem rotação de culturas; cultura perene; e preparo convencional, além de uma área de mata (referência). Inicialmente, fez-se a descrição do perfil cultural e, na sequência, coletaram-se 10 amostras de solo em cada manejo considerado e sob mata nativa para quantificar o teor de matéria orgânica, o grau de floculação, a densidade e a macroporosidade do solo. Os resultados indicaram mudanças estruturais até 50 cm de profundidade com predomínio de unidades estruturais ∆µ (nível intermediário de compactação) nos manejos cultura perene e semeadura direta com rotação de culturas e unidades estruturais ∆ (compactado), nos manejos preparo convencional e semeadura direta. A degradação do solo, da menor para a maior, ocorreu na seguinte ordem: Mata => semeadura direta com rotação de culturas => cultura perene => semeadura dir...

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Section: Evaluation Of the Soil Morphologysupporting

confidence: 92%

Section: Evaluation Of the Soil Morphologymentioning

confidence: 48%

Section: Evaluation Of the Soil Morphologymentioning

confidence: 99%

Section: Evaluation Of the Soil Morphologymentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Structural changes and degradation of Red Latosols under different management systems for 20 years

Filho

Melo

Machado

et al. 2014

Rev. Bras. Ciênc. Solo

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Mitigation of clayey soil compaction managed under no-tillage

Nunes

Denardin

Pauletto

et al. 2015

Soil and Tillage Research

103

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Soil physical properties Development of corn plants Fixed shank openers A B S T R A C TSoil compaction has always been a problem to the agricultural productivity, mainly in clayey soils under the no-tillage (NT). Alternatives to mitigate this problem are necessary. The aim of this study was to evaluate the effect of seeder equipped with fixed shanks openers, working at three depths, in a Ferralic Nitisol (Rhodic), under NT on the mitigation of soil compaction and corn (Zea mays L.) plant development. The test comprised three treatments regarding the depth at which the shank openers of a seeder used to sow corn worked: openers reaching up to 0.05 m; openers reaching up to 0.07 m; and openers reaching up to 0.17 m. The effect of these treatments was evaluated in relation to the determination of soil physical parameters, and corn plant parameters. The use of a seeder equipped with fixed shanks openers up to 0.17 m depth caused an increase in soil macroporosity and total porosity, and a decrease in soil bulk density, soil resistance to penetration and degree of compactness in the layer between 0.07 and 0.17 m. The improved physical conditions of the soil in this layer led to a further development of the root system of plants in greater depth, and consequently to a better development of corn plants with higher stalk diameter, root density and root length. The use of a seeder equipped with fixed shanks openers working up to 0.17 m depth, therefore, promoted physical improvement to the soil, favoring the development of corn plants, and presenting potential to mitigate the compaction of clayey soils under NT.

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