53 results

Least limiting water range and degree of soil compaction of an oxisol after 30 years of no-tillage

Edner Betioli Júnior, Wagner Henrique Moreira, Cássio Antônio Tormena, Camila Jorge Bernabé Ferreira, Álvaro Pires da Silva, Neyde Fabíola Balarezo Giarola

01/Jun/2012

The soil physical quality is one of the factors that determine the agronomic, economic and environmental sustainability in long-term no-tillage systems (NT). Soil compaction has been discussed as a factor that contributes to a reduction in physical quality under NT. However, the use of NT can increase soil organic matter and lead to a continuous and stable porous system that mitigates the negative impacts of compaction. The purpose of this study was to evaluate the physical quality of an Oxisol […]

Physical properties of an oxisol in an integrated crop-livestock system

Wagner Henrique Moreira, Edner Betioli Junior, Leonardo Pim Petean, Cássio Antônio Tormena, Sérgio José Alves, Marco Aurélio Teixeira Costa, [...]

01/Apr/2012

The trampling of grazing animals can compact the surface layers and affect the physical quality of soils in crop-livestock systems (ICL). The hypothesis of this study is that increased trampling from animal grazing of oats and ryegrass reduces the soil physical quality of an Oxisol under no-tillage with ICL. The purpose of this study was to quantify bulk density (Bd), air-filled porosity (εa), soil air permeability (Ka), soil resistance to penetration (SR) and estimate an index of pore continuity from […]

Influence of soil bulk density in a dystroferric red ultisol moisture estimated by time domain reflectometry

Antônio Carlos Andrade Gonçalves, Marcos Antonio Trintinalha, Cássio Antônio Tormena, Marcos Vinicius Folegatti

01/Oct/2011

Among the techniques for soil moisture evaluation, the use of Time Domain Reflectometry (TDR) stands out, which consists of an indirect, non-destructive, fast and accurate method less dependent on environmental factors. However, works carried out after its applications suggest the influence of factors related to soils structural and mineralogical characteristics, which makes necessary the site calibration for the TDR proper functioning. The aim of this work was to study the influence of bulk density (Ds) on the volumetric soil water […]

Aggregate stability of a degraded oxisol in recovery with green manure, lime and gypsum

Carolina dos Santos Batista Bonini, Marlene Cristina Alves

01/Aug/2011

Inadequate land use and large buildings in rural areas are causing damages to the soil-climate environment, reducing productivity and thus expanding degraded areas. In view of this problem, this study evaluated the recovery of an Oxisol that had been treated with green manure, soil amendment, gypsum and pasture in the last 17 years. The quality of the structure was used as an indicator of soil recovery. The study was conducted in a completely randomized design with nine treatments and four […]

Physical properties of a red-yellow latosol under three different systems of coffee management in the state of minas gerais

Davi Lopes do Carmo, Dulcimara Carvalho Nannetti, Moacir de Souza Dias Júnior, Djalma José do Espírito Santo, Alex Nogueira Nannetti, Tales Machado Lacerda

01/Jun/2011

In view of the different managements used in coffee production, this study aimed to quantify the changes of some physical properties of an Oxisol under four-year-old coffee, in southern Minas Gerais. Three management systems were compared to native forest. The following management systems were evaluated: mechanized coffee production (CCM), coffee without mechanization (CSM), dense coffee plantation (CA) and native forest (MN) as reference. Undisturbed samples were collected with an Uhland sampler and aluminum rings (diameter 6.35 cm, height 2.54 cm), […]

Least limiting water range of a dystroferric red latosol under no-tillage in an integrated crop-livestock system

Leonardo Pim Petean, Cássio Antonio Tormena, Sérgio José Alves

01/Oct/2010

The least limiting water range (LLWR) is considered a modern indicator of soil physical quality for plant growth. The aim of this study was to determine the LLWR for assessing the soil physical quality of a dystroferric Red Latosol (Oxisol) under no-tillage in a crop-livestock integration system. In the crop-livestock integration system of the study area, soybean was planted in the summer and oat (Avena strigosa Schreb) plus ryegrass (Lolium multiflorum Lam) in the winter with different pasture heights during […]

Soil aggregation in a crop-livestock integration system under no-tillage

Edicarlos Damacena de Souza, Sérgio Ely Valadão Gigante de Andrade Costa, Ibanor Anghinoni, Paulo César de Faccio Carvalho, Eric Victor Ferreira de Oliveira, Amanda Posselt Martins, [...]

01/Aug/2010

Grazing intensities can influence soil aggregation, which can be temporarily and permanently affected. The objective of this study was to evaluate the aggregate stability in water at the end of a soybean cycle and during pasture development in a crop-livestock integration system under no-tillage and grazing intensities. The experiment was initiated in 2001, in a dystrophic Red Latosol, after soybean harvest. Treatments consisted of pasture (black oat + Italian ryegrass) at heights of 10, 20 and 40 cm, grazed by young […]

Effects of different management systems on porosity of oxisols in Paraná, Brazil

João Tavares Filho, Daniel Tessier

01/Jun/2010

Soils play a fundamental role in the production of human foods. The Oxisols in the state of Paraná are among the richest and most productive soils in Brazil, but degradation and low porosity are frequently documented, due to intensive farming involving various management strategies and the application of high-tech solutions. This study aims to investigate changes in the porosity of two Red Oxisols (Latossolos Vermelhos), denoted LVef (eutroferric) and LVdf (dystroferric) under conventional and no-tillage soil management, with a succession […]

Soil tillage in grain and silage-producing areas and pasture: effect on tensile strength and aggregate friability

Marina Araújo Bavoso, Neyde Fabíola Balarezo Giarola, Cássio Antônio Tormena, Volnei Pauletti

01/Feb/2010

The understanding and quantification of soil use and management on the soil physical quality are important to develop and select sustainable agricultural systems. The purpose of this study was to evaluate the structural quality of a clayey Brazilian Oxisol under different production and soil tillage systems by measuring the tensile strength (TS) and to quantify aggregate friability (F). The study was conducted in Castro, Paraná state, in southern Brazil, using three production systems and seven soil tillage types, in a […]

The effect of plantation silviculture on soil organic matter and particle-size fractions in Amazonia

Troy Patrick Beldini, Kenneth L McNabb, B. Graeme Lockaby, Felipe G Sanchez, Osvaldo Navegantes-Câncio, Raimundo Cosme de Oliveira

01/Dec/2009

Eucalyptus grandis and other clonal plantations cover about 3.5 million ha in Brazil. The impacts of intensively-managed short-rotation forestry on soil aggregate structure and Carbon (C) dynamics are largely undocumented in tropical ecosystems. Long-term sustainability of these systems is probably in part linked to maintenance of soil organic matter and good soil structure and aggregation, especially in areas with low-fertility soils. This study investigated soil aggregate dynamics on a clay soil and a sandy soil, each with a Eucalyptus plantation […]

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