44 results

Physical properties and organic carbon of an oxisol affected by different land use and soil management systems

Eduardo Torres Viana, Marcelo Augusto Batista, Cássio Antonio Tormena, Antonio Carlos Saraiva da Costa, Tadeu Takeyshi Inoue

01/Dec/2011

Understanding and quantifying the impact of land use and soil management on soil organic carbon (SOC) levels and physical properties is essential for the development of a sustainable agriculture. The purpose of this study was to evaluate some physical properties and SOC of an Oxisol in the Northwest of the state of Paraná, under different use and soil management systems, i.e., under native forest, pasture, cassava, and sugarcane. Disturbed soil samples were collected for particle size, particle density, proctor and […]

Soil tillage systems and cover crops in organic production of common bean and corn. I – soil physical properties

Eurâimi de Queiroz Cunha, Luís Fernando Stone, José Aloísio Alves Moreira, Enderson Petrônio de Brito Ferreira, Agostinho Dirceu Didonet, Wilson Mozena Leandro

01/Apr/2011

The influence of cover crops and their management on the maintenance or improvement of soil physical quality in areas under organic production should be investigated. This study aimed to determine the influence of the cover crops sunn hemp (Crotalaria juncea), pigeon pea (Cajanus cajan (L.) Millsp), velvet bean (Mucuna aterrima), sorghum (Sorgum technicum), and fallow on physical properties of soil under organic cultivation of common bean and corn, in no-tillage (NT) and conventional tillage (CT) systems. The study was conducted […]

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 […]

Sewage sludge application to agricultural land as soil physical conditioner

Isabella Clerici De Maria, Márcio Koiti Chiba, Alan Costa, Ronaldo Severiano Berton

01/Jun/2010

Water resource quality is a concern of today’s society and, as a consequence, low pollutant wastewaters and sludges are being increasingly treated, resulting in continuous production of sewage sludge. Sewage sludge (SS) can be used as soil physical conditioner of agricultural or degraded lands, due to its organic C component. The objective of this research was to evaluate the long-term SS effects on soil physical quality of properties such as bulk density, porosity, permeability and water retention of degraded soils […]

Physical and chemical properties of an oxisol cultivated under pastures with distinct use history

Iara Terezinha Pignataro Netto, Eiyti Kato, Wenceslau J. Goedert

01/Oct/2009

The sustainable use of pasture systems depends mainly on a management that promotes soil quality. This study aimed to evaluate changes in the physical and chemical soil properties of four areas under pasture growing the species Andropogon gayanus, Brachiaria decumbens and Brachiaria brizantha, cv. marandu, with different usage histories, in comparison to the reference of the natural Cerrado. The soil was evaluated based on the following properties: cation exchange capacity, soil organic matter, bulk density, porosity and soil mechanical penetration […]

Influence of mechanical load levels on physical properties of a eutric cambisol

Karina Maria Vieira Cavalieri, Álvaro Pires da Silva, Johan Arvidsson, Cássio Antonio Tormena

01/Jun/2009

The objective of this study was to evaluate the effects of different mechanical loads on soil physical properties of a Eutric Cambisol with loam sandy texture. The soil load distribution (kPa) was measured in situ by sensors placed in different soil layers. The soil physical properties evaluated were the bulk density (Ds) and the soil penetration resistance (RP) on sugarbeet (Beta vulgaris L.) row and interrow down to 0.30 m depth. The treatments were: without extra pressure exerted by the […]

Physical attributes of an albaqualf under management systems in comparison with those under native grassland

Cláudia Liane Rodrigues de Lima, Clenio Naito Pillon, Luis Eduardo Akiyoshi Sanches Suzuki, Lucia Elena Coelho da Cruz

01/Oct/2008

The soil management may influence soil hydro-physical conditions and crop yield. The objective of this study was to determine soil physical properties of an Albaqualf under management systems and to compare them with those under a native pasture. The bulk density, saturated hydraulic conductivity, macroporosity, microporosity, total porosity and aggregation were evaluated in the soil layers 0-0.025; 0.025-0.075; 0.075-0.125; 0.125-0.175; and 0.175-0.275 m. The hydro-physical soil conditions in no-till and conventional systems were similar. The conditions in the soil under native […]

Estimating penetration resistance of an oxisol under perennial crop in northern Paraná state

Adriana Aparecida Ribon, João Tavares Filho

01/Oct/2008

Soil resistance to root penetration is an important physical characteristic for defining soil management techniques. The purpose of this study was to estimate the mechanical soil penetration resistance of an Oxisol under perennial crop, at three gravimetrical moisture contents, based on bulk density, moisture, and soil clay and organic matter content. The soil penetration resistance was evaluated by an impact penetrometer and the impact data in dm-1 were converted into dynamic resistance (MPa). At the moment of the determination of […]

Short and long-term effects of tillage systems and nutrient sources on soil physical properties of a Southern Brazilian Hapludox

Milton da Veiga, Dalvan José Reinert, José Miguel Reichert, Douglas Rodrigo Kaiser

01/Aug/2008

Soil tillage promotes changes in soil structure. The magnitude of the changes varies with the nature of the soil, tillage system and soil water content and decreases over time after tillage. The objective of this study was to evaluate short-term (one year period) and long-term (nine year period) effects of soil tillage and nutrient sources on some physical properties of a very clayey Hapludox. Five tillage systems were evaluated: no-till (NT), chisel plow + one secondary disking (CP), primary + […]

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