Agregação de ume nitossolo vermelho distroférrico sob sistemas de plantio direto, preparo convencional e mata nativa

Assis, Renato Lara de; Lanças, Kléber Pereira

doi:10.1590/s0100-69162010000100006

Cited by 7 publications

(8 citation statements)

References 17 publications

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“…There was no significant reduction in soil aggregation with the introduction of the 6 year no-tillage system in areas of native Cerrado, as shown in Figure 1. This result agrees with specialized literature (Assis & Lanças, 2010;Franchini et al, 2012), which emphasizes the positive effect of no-tillage over soil aggregation indexes due to the lack of mechanical destruction of aggregates by implements and to the protection that straw cover offers to the soil surface (Morais & Cogo, 2001), favoring a better distribution and morphology of the aggregates at surface level, showing that this management system is similar to the original structuring conditions (Hickmann et al, 2011).…”

Section: Resultssupporting

confidence: 91%

“…The lowest values of mean geometric diameter, mean weight diameter, and aggregate stability index were obtained in 8-year conventional tillage and 6-year eucalypt (Figures 1 and 2). The results obtained for 8-year conventional tillage agree with other studies (Fontenele et al, 2009;Assis & Lanças, 2010), which confirm that adoption of conventional tillage with substantial soil turnover for a long period contributed to reducing the stability of aggregates in water. In this regard, studies show that conventional tillage contributes to the reduction of organic carbon contents in soils (Salton et al, 2008), as well as significantly impairing soil structure (Oliveira et al, 2003).…”

Section: Resultssupporting

confidence: 90%

“…However, conventional tillage leads to destructuring of the soil over time. These results agree with those found by Assis & Lanças (2010) upon observing that the time of adoption of the no-tillage system favored soil aggregation.…”

Section: /9supporting

confidence: 92%

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Soil use and management systems, time since adoption, and their impacts over aggregation

Silva

Santos

Nóbrega

et al. 2018

Agraria

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The Cerrado biome is of notable territorial relevance in the state of Piaui, Brazil. This region is an area of reference for food production. The aim of this work was to evaluate the stability of soil aggregates in water, in function of different soil use and management systems, as well as of the time since adopting these systems in Cerrado areas in the southwest region of Piaui. In this study, nine soil use and management systems were evaluated, arranged in the following manner: no-tillage system of three and six years of use, pasture of two and six years, eucalypt of six and twelve years, conventional tillage of two and eight years, and native Cerrado (Savana). The analyzed variables were: organic carbon, mean geometric diameter, mean weight diameter, aggregate stability index and aggregate diameter classes. Aggregation in Ferralsol is favored by clay and organic carbon contents. The longer adoption time in the no-till, pasture and eucalypt systems favored soil aggregation, while in conventional tillage there was a reduction of the aggregates.

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Section: Resultssupporting

confidence: 91%

Section: Resultssupporting

confidence: 90%

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Soil use and management systems, time since adoption, and their impacts over aggregation

Silva

Santos

Nóbrega

et al. 2018

Agraria

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“…It noteworthy that the greater the WMD index, the higher is the proportion of the major aggregate class, whereas the mean geometric diameter (MGD) represents only an estimate of the classes of greatest occurrence. In contrast, Assis & Lanças (2010) stated that the distribution of soil aggregates in a notillage system (12 years) was closest to that of soil under native forest. Soil aggregation under conventional tillage was in some cases similar to notillage in all layers evaluated in 2008/09, contradicting the studies of Aratani et al (2009), who observed a more pronounced positive effect of no-tillage over conventional tillage.…”

Section: Resultsmentioning

confidence: 95%

Physical quality of an Oxisol after different periods of management systems

Rossetti

Centurion

Neto

2013

Rev. Bras. Ciênc. Solo

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SUMMARYManagement systems may lead to a loss of soil physical quality as a result of removal of the plant cover and excessive agricultural mechanization. The hypothesis of this study was that the soil aggregate stability, bulk density, macro-and microporosity, and the S index and saturated hydraulic conductivity may be used as indicators of the soil physical quality. The aim was to study the effects of different periods and managements on the physical attributes of a medium-textured Red Oxisol under soybean and corn for two growing seasons, and determine which layers are most susceptible to variations. A completely randomized experimental design was used with split plots (five treatments and four layers), with four replications. The treatments in 2008/09 consisted of: five years of no-tillage (NTS5), seven years of no-tillage (NTS7), nine years of no-tillage (NTS9), conventional tillage (CTS) and an adjacent area of native forest (NF). The treatments were extended for another year, RESUMO: QUALIDADE FÍSICA DE UM LATOSSOLO SOB DIFERENTES TEMPOS E MANEJOSOs sistemas de manejo podem ocasionar a perda da qualidade do solo, em decorrência da retirada da cobertura vegetal e do excessivo uso da mecanização. A hipótese desta pesquisa foi que a estabilidade de agregados, a densidade do solo, a macro e a microporosidade do solo, o índice S e a condutividade hidraúlica saturada pudessem ser utilizados como indicadores de qualidade física do solo. Diante disso, objetivaram-se estudar os efeitos dos diferentes tempos e manejos nos atributos físicos de um Latossolo Vermelho de textura média, cultivado por dois anos agrícolas, com soja e milho e determinar quais são as camadas mais susceptíveis a variações. O delineamento experimental foi inteiramente casualizado com parcelas subdivididas (cinco tratamentos e quatro camadas), com quatro repetições. Os tratamentos em 2008/09 foram: plantio direto por cinco anos (NTS5), plantio direto por sete anos (NTS7), plantio direto por nove anos (NTS9), preparo convencional (

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“…Maiores valores de DMP em área de mata nativa também foram observados por Assis & Lanças (2010) como resultado do acúmulo de matéria orgânica e de não ocorrer ação antrópica por mais de quarenta anos, fatores que influenciaram fortemente a agregação do solo. Sob sistema de preparo convencional ocorreu fracionamento dos agregados maiores em unidades menores o que causou modificações significativas em relação às características originais, que foram mais afetadas quanto maior a intensidade do preparo do solo.…”

Section: Resultsunclassified

Propriedades físicas de um Nitossolo Vermelho em função dos sistemas de uso e manejo

Marasca

Gonçalves

Moraes

et al. 2013

Rev. bras. eng. agríc. ambient.

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RESUMOO solo, um dos principais suportes da produção agrícola tem seu comportamento regido por um complexo conjunto de fatores físicos, químicos e biológicos, razão pela qual o presente trabalho teve como objetivo avaliar as modificações dos atributos físicos de um Nitossolo Vermelho distroférrico com diferentes manejos, na Faculdade de Ciências Agronômicas -UNESP, Campus de Botucatu, São Paulo, Brasil. O delineamento estatístico foi inteiramente casualizado, com seis repetições em três diferentes áreas, sendo uma área de mata nativa, uma área com sistema de preparo convencional do solo e uma área com plantio direto. Foram determinados: matéria orgânica, argila natural, porosidade total, macroporosidade, densidade do solo, resistência à penetração e diâmetro médio ponderado dos agregados. O sistema de preparo convencional apresentou os menores teores de matéria orgânica na camada até 0,20 m. Na resistência à penetração não houve diferença entre os tratamentos. Para as cinco profundidades do sistema de preparo convencional observaram-se maior densidade e teor de argila natural em comparação aos outros sistemas. O sistema de preparo convencional diferiu dos demais tratamentos quanto ao diâmetro médio ponderado, porosidade total e macroporosidade apresentando os menores valores desses atributos.Palavras-chave: densidade do solo, matéria orgânica e resistência mecânica do solo a penetração Physical properties of an distroferric Red Nitosol depending on the use and management systems ABSTRACT The soil is a mainstay of agricultural production, and its behavior governed by a complex set of physical, chemical and biological processes. The aim of this study was to evaluate the changes in the physical attributes of a distroferric Red Nitosol under different managements in the Faculty of Agricultural Sciences -UNESP, Botucatu, São Paulo, Brazil. The experimental design was completely randomized with six replications, in three diferent areas, an area with native forest, an area with conventional soil tillage and an area with no soil tillage. The organic matter, natural clay, total porosity, macroporosity, bulk density, penetration resistance and the mean diameter of the aggregates were determined. The conventional tillage had the lowest concentrations of organic matter in the layer up to 0,2 m. For penetration resistance, no differences among treatments were observed. For the five depths of conventional tillage, higher density and natural clay content were observed, compared to other systems. The conventional tillage treatments differed from the others for the mean diameter, total porosity and macroporosity, as it had the lowest values of these attributes.

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Agregação de ume nitossolo vermelho distroférrico sob sistemas de plantio direto, preparo convencional e mata nativa

Cited by 7 publications

References 17 publications

Soil use and management systems, time since adoption, and their impacts over aggregation

Soil use and management systems, time since adoption, and their impacts over aggregation

Physical quality of an Oxisol after different periods of management systems

Propriedades físicas de um Nitossolo Vermelho em função dos sistemas de uso e manejo

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