Propriedades físico-hídricas em Latossolo do Cerrado sob diferentes sistemas de manejo

Figueiredo, Cícero Célio de; Santos, Glênio Guimarães; Pereira, S.M.; Nascimento, Jorge Luiz do; Júnior, José Alves

doi:10.1590/s1415-43662009000200006

Cited by 25 publications

(24 citation statements)

References 9 publications

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“…Na compactação do solo há aumento de massa por unidade de volume resultando em aumento na densidade, na resistência à penetração de raízes e na microporosidade relativa, o que contribui para a redução linear da porosidade total e da macroporosidade (Beutler et al, 2005) e, consequentemente, pode causar modificações na retenção de água do solo decorrentes das alterações sofridas na distribuição do diâmetro de poros (Figueiredo et al, 2009).…”

Section: Palavrasunclassified

Desempenho de plantas de cobertura sob níveis de compactação em Latossolo Vermelho de Cerrado

Lima

Petter

Leandro

2015

Rev. bras. eng. agríc. ambient.

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R E S U M O Performance of cover crops under different compaction levels in Oxisol in the Brazilian Savannah A B S T R A C TThe objective of this study was to evaluate the performance of cover crops in an Oxisol in 'Cerrado' under compaction levels. The experimental design was in a randomized blocks in 4 x 5 factorial, composed by four cover crops (Urochloa brizantha; Pennisetum glaucum cv. ANM 17; Crotalaria ochroleuca and Eleusine coracana cv. ANPG 207) and five levels of soil density (1.1; 1.3; 1.5; 1.7 and 1.9 Mg m -3 ) . For U. brizantha; P. glaucum; C. Ochroleuca higher values of height, stem diameter, leaf number and leaf area were observed at densities from 1.3 to 1.5 Mg m . The percentage distribution of the roots of E. coracana below the compacted layer increases with increasing density. E. coracana and U. brizantha stand out as plants with potential to reduce soil bulk density. Palavras-chave:plantio direto rotação de culturas densidade do solo raízes

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Section: Palavrasunclassified

Desempenho de plantas de cobertura sob níveis de compactação em Latossolo Vermelho de Cerrado

Lima

Petter

Leandro

2015

Rev. bras. eng. agríc. ambient.

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“…A compactação, devida à atividade agropecuária, também pode causar modificações na retenção de água do solo, decorrentes de alterações sofridas na distribuição do diâmetro de poros, principalmente redução da macroporosidade (Figueiredo et al, 2009). Todavia, a disponibilidade de água para as plantas depende do nível de compactação e da distribuição do diâmetro de poros resultante (Hillel, 1980).…”

Section: Compactação Do Solounclassified

Uso e manejo do solo e seus impactos sobre a qualidade física

Stefanoski¹,

Santos²,

Marchão

et al. 2013

Rev. bras. eng. agríc. ambient.

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RESUMOO uso racional do solo tem sido objeto de estudo e discussões em função da busca de alternativas tecnológicas que possibilitem o manejo correto do solo e, consequentemente, uma agricultura sustentável. Objetivou-se, com este trabalho, levantar dados sobre a qualidade físico-hídrica e sua relação com os impactos gerados pelo manejo do solo por meio de uma revisão bibliográfica, contribuindo para melhor conhecimento das informações disponíveis na literatura. O uso de indicadores de qualidade física do solo permite designar práticas adequadas de manejo do solo. Uma análise crítica dos indicadores de qualidade física do solo revela que o índice proposto por Reynolds et al. (2002) possui limitações quanto ao uso, o intervalo hídrico ótimo apresenta bons resultados e o índice S necessita de mais trabalhos com o uso de h (tensão de água no solo) como variável independente. Assim, os indicadores de qualidade física do solo são úteis para avaliação do estado de conservação do solo possibilitando a gestão segura dos recursos naturais; todavia, os indicadores existentes apresentam, como inconvenientes, a elevada complexidade de execução e os custos de obtenção, o que configura oportunidade para o desenvolvimento de novos indicadores de qualidade física do solo.Palavras-chave: sistemas de manejo, compactação, estrutura do solo, indicadores de qualidade física Soil use and management and its impact on physical quality ABSTRACT The rational use of the soil has been the subject of study and discussion due to search for technological alternatives that allow the adequate management of the soil and consequently, a sustainable agriculture. The objective of this study was to collect data about the hydro-physical quality and its relation to the impacts caused by soil management through a literature review, contributing to better understanding of existing information in the literature. The use of indicators of physical quality of soil permit the designation of most appropriate soil management practices, especially those exposed to intensive agriculture. A critical analysis of indicators of soil quality show that the index proposed by Reynolds et al. (2002) has limitations about its use, the optimal hydric interval presents good results, and the S index needs more works with the use of h (soil-water suction) as the independent variable. Thus, the indicators of physical quality of soil are useful for evaluating the state of soil conservation, to making possible the secure management of natural resources, however, the existing indicators present very high complexity of the implementation and acquisition costs, which configures opportunity for the development of new indicators of physical quality of soil.

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“…The higher values of Bd in the surface horizons of the pasture primarily occurred due to the presence of higher contents of sand, which naturally has Pd than clay (Dias Junior and Estanislau, 1999). Secondly, the change in land use, from forest to pasture, together with the wetting and drying cycles, probably contributed to such values (Araújo et al, 2004;Figueiredo et al, 2009). In general, the highest values of Bd of the toposequences occurred in the Bt horizons.…”

Section: Resultsmentioning

confidence: 94%

“…This is correlated with the structural change that occurs between the granular structure in the surface horizons and the angular and subangular blocky structure of the subsurface horizons, as well as the soil textural change from sandy, with higher macroporosity, to clayey, with higher microporosity. Gravel, present mainly in depth, also influences these values of Bd, and these gravels are found in the horizons with the highest clay contents due to drainage restriction (Figueiredo et al, 2009), the occurrence of petroplinthite, and altered parent material.…”

Section: Resultsmentioning

confidence: 99%

Characterization and Classification of Soils under Forest and Pasture in an Agroextractivist Project in Eastern Amazonia

Zenero

Silva

Castilho

et al. 2016

Rev. Bras. Ciênc. Solo

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Knowledge of soils in the Amazon rainforest is becoming increasingly essential due to dynamics adopted by farmers that substitute forest for pastures, together with growing pressure from diverse segments of society towards adoption of sustainable production systems. The objective of this study was to characterize the soils along two toposequences, one under forest (F) and the other under pasture (P), and to verify how the change in land use influences soil attributes, evaluating their inclusion in the Brazilian Soil Classification System (SiBCS). The soils were sampled in pits located at the summit, backslope and footslope positions for morphological, chemical, physical, and clay mineralogy analysis. The results show that the soils are chemically poor and predominately kaolinitic. Sandy and loamy sand soils are in the surface horizons, with an increase in clay content with depth. The highest values of bulk density and lowest values of macroporosity were observed in the Bt horizons due to the change from a granular structure in the surface to an angular and subangular blocky structure in these horizons. The morphological properties observed in the field are strongly influenced by the annual soil water dynamics, the parent material, and the landscape, representing diagnostic characteristics that influenced classification of the soils, such as aquic with episaturation (epirredóxico), saprolitic, and gravelly. These diagnostic characteristics in the Argissolo Amarelo (Hapludults) are important morphological properties that have not been highlighted by the current edition of the SiBCS.

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Propriedades físico-hídricas em Latossolo do Cerrado sob diferentes sistemas de manejo

Cited by 25 publications

References 9 publications

Desempenho de plantas de cobertura sob níveis de compactação em Latossolo Vermelho de Cerrado

Desempenho de plantas de cobertura sob níveis de compactação em Latossolo Vermelho de Cerrado

Uso e manejo do solo e seus impactos sobre a qualidade física

Characterization and Classification of Soils under Forest and Pasture in an Agroextractivist Project in Eastern Amazonia

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