Estoque de carbono no solo e agregados em Argissolo sob diferentes manejos de longa duração

Hickmann, Clério; Costa, Liovando Marciano da

doi:10.1590/s1415-43662012001000004

Cited by 31 publications

(23 citation statements)

References 20 publications

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“…This higher carbon concentration was due to plant residue accumulation during crop growth (Freixo et al, 2002;Lovato et al, 2004;Sisti et al, 2004;Hickmann and Costa, 2012;Asmann et al, 2014). Furthermore, it could be due to a decrease in mineralization rate (DICK, 1983).…”

Section: Resultsmentioning

confidence: 99%

No-tillage effect on carbon and microbiological attributes in corn grown in Manaus-AM, Brazil

Muniz¹,

Nunes²,

Silva³

et al. 2018

Afr. J. Agric. Res.

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The soil is the most important carbon reservoir, but agricultural practices involved in tillage systems decrease the soil carbon stock. This study aims to evaluate the effect of no-tillage (NT) on carbon and microbiological attributes of the soil in corn plantations in Manaus-AM, Brazil. Soil was sampled in a secondary forest (SF) and in corn grown under different tillage systems, including conventional tillage (CT), which makes use of plowing and harrowing operations, and no-tillage (NT). Soil variables studied included, carbon content, soil microbial carbon and basal respiration, metabolic and microbial quotients. The data were analyzed by analysis of variance and Tukey's test. The results demonstrated that NT resulted higher carbon, lower basal respiration, and lower metabolic quotient than CT and SF. However, soil microbial carbon was similar in all tillage systems studied. We conclude that NT corn cropping increased soil carbon content more than CT, while it decreased basal respiration and metabolic quotient when compared to NT and SF. Moreover, soil microbial biomass in corn was similar in all tillage systems studied. This research demonstrated the importance of NT to soil carbon conservation and soil management in corn cropping.

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Section: Resultsmentioning

confidence: 99%

No-tillage effect on carbon and microbiological attributes in corn grown in Manaus-AM, Brazil

Muniz¹,

Nunes²,

Silva³

et al. 2018

Afr. J. Agric. Res.

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“…The Mi had the same tendency as the TP, and the Ma did not differ significantly between the management systems ( Table 1). The results for the BD, TP and Mi are ascribed to: (i) the increase in the crop residue and soil organic carbon at the surface layer (NT) (Hickmann & Costa, 2012) and (ii) the formation and stabilization of biopores as a consequence of the absence of the soil disturbance in NT compared with CT (Kautz, 2014). In the absence of soil tillage, the increase in the soil organic carbon and the biopores improved the soil aggregation (Fernández-Ugalde et al, 2009;Sheehy et al, 2015), making the soil less dense and more porous (Cássaro et al, 2011).…”

Section: Resultsmentioning

confidence: 99%

Influence of physical attributes and pedotransfer function for predicting water retention in management systems

Auler

Pires

Pineda

2017

Rev. bras. eng. agríc. ambient.

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A B S T R A C TThe aims of this study were to evaluate the effects of the soil structural physical attributes on the water retention and to develop pedotransfer functions (PTFs) for the estimation of the soil water content (θ) at different matric potentials of a Dystrophic Red Latosol (Hapludox) under conventional tillage (CT) and no-tillage (NT) soil management systems. The effects of long-term CT and NT (over 25 years) management on the soil bulk density (BD), total porosity (TP), macroporosity (Ma), microporosity (Mi) and water retention were investigated. The PTFs were developed to predict θ and used to evaluate the soil water retention curve only for the NT system. The NT system was characterized by smaller values of the soil BD and higher values of the soil TP and Mi than the CT system. The NT system exhibited a higher θ retained than the CT system for the pore-size interval of 0.2-30 µm. However, the CT system exhibited a large amount of water retention for pores smaller than 0.2 µm. The PTFs were utilized to estimate θ at matric potentials of -1, -3, -6, -10, -33, -100, -400, -800, and -1,500 kPa with adequate accuracy. The soil BD, Ma, Mi and sand content were the main variables considered to estimate θ for the different matric potentials evaluated.Atributos físicos e funções de pedotransferência para estimativa da retenção de água em sistemas de manejo R E S U M OOs objetivos deste estudo foram avaliar os efeitos de atributos físicos estruturais do solo sobre a retenção de água e desenvolver funções de pedotransferência (FPT) para a estimativa de conteúdos de água (θ) em diferentes potenciais mátricos de um Latossolo Vermelho distrófico em sistema convencional (SC) e sistema plantio direto (SPD). Os efeitos de longo prazo dos manejos SC e SPD (mais de 25 anos) sobre a densidade do solo (DS), porosidade total (PT), macroporosidade (Ma), microporosidade (Mi) e retenção de água foram investigados. As FPT foram desenvolvidas para predizer os θs utilizados na determinação da curva de retenção de água apenas para o SPD. O SPD apresentou menor DS e maior PT e Mi que o SC. O SPD aumentou o conteúdo de água retido em poros de tamanho entre 0,2 e 30 µm, em relação ao SC. No entanto, o SC apresentou maior conteúdo de água retido em poros com raio menor que 0,2 µm. As FPTs utilizadas para estimar θ para os potenciais mátricos de -1, -3, -6, -10, -33, -100, -400, -800 e -1500 kPa tiveram acurácia adequada. A DS, Ma, Mi e teor de areia foram as principais variáveis consideradas para estimar o conteúdo de água nesses potenciais mátricos. Key words:no-tillage conventional tillage soil porosity Palavras-chave: sistema plantio direto sistema plantio convencional porosidade do solo

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“…Na Figura 3, observam-se as diferenças visuais entre as áreas estudadas, sendo possível identificar as diferentes formas de estruturação avaliadas pela metodologia. Na área de ambiente natural (mata -a), observou-se uma aparente deposição de serrapilheira, como substrato de matéria orgânica e sua contribuição na estruturação superficial do solo, sendo o elemento carbono o principal agente na melhoria da qualidade estrutural desses solos (Hickmann & Costa, 2012). Na área de pastagem (b), observou-se uma uniformidade de estruturação ao longo do bloco, o que lhe conferiu Qe médio.…”

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Avaliação visual da qualidade da estrutura do solo em sistemas de uso das terras

et al. 2014

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Recebido para publicação em 26/03/2013 Sistemas sustentáveis de produção agropecuária demandam solos com boa estrutura, por isso, são necessários métodos eficientes para avaliação dessa estrutura. Objetivou-se, com este estudo, aplicar a metodologia de avaliação visual da estrutura do solo, em áreas previamente cobertas por Floresta com Araucária, em longo período de uso após o desmatamento. Selecionaram-se áreas sob três tipos de usos: floresta nativa, pastagem e cultivo agrícola, considerados como tratamento, sendo realizadas dez amostragens por tipo de uso. Nas amostras coletadas, procedeu-se à avaliação da qualidade da estrutura do solo, seguida da análise estatística dos dados, por meio da análise de variância e do teste de separação de médias. Observaram-se diferenças significativas nos valores médios de escore entre as áreas avaliadas. Os solos da área com floresta apresentaram Qe (Qualidade visual) médio = 1.68, estatisticamente semelhante ao dos solos sob pastagem (Qe médio = 2.25) e inferior ao dos solos cultivados, Qe médio = 2.40. Os valores de Qe obtidos por avaliação visual da qualidade da estrutura do solo mostraram-se eficientes para identificar diferenças entre os sistemas de uso do solo. Visual assessment of soil structure quality in land use systems Sustainable agricultural production systems require well-structured soils and, thus, efficient methods for the assessment of soil structure are required. The objective of this study was to apply the methodology of visual quality of the soil structure in areas previously covered by Araucaria Forest and long-term use after deforestation. The following areas under three types of land use were selected: forest, pasture and farming, considered as treatments, from which ten samples were collected by each type of land use. In the collected samples, the visual quality of soil structure was carried out followed by statistical analysis, by means of analysis of variance and mean separation test. Significant differences in mean scores were found among the assessed areas. The soils under forest cover showed a mean Ve (visual score) = 1.68, statistically similar to the soil under pasture (mean Ve = 2.25) and lower than the farmed soils, (mean Ve = 2.40). Values of visual score obtained by visual assessment of the quality of soil structure were effective to identify differences among land use systems. Palavras

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Estoque de carbono no solo e agregados em Argissolo sob diferentes manejos de longa duração

Cited by 31 publications

References 20 publications

No-tillage effect on carbon and microbiological attributes in corn grown in Manaus-AM, Brazil

No-tillage effect on carbon and microbiological attributes in corn grown in Manaus-AM, Brazil

Influence of physical attributes and pedotransfer function for predicting water retention in management systems

Avaliação visual da qualidade da estrutura do solo em sistemas de uso das terras

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