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8 results

Visual Evaluation of the Soil Structure under Different Management Systems in Lowlands in Southern Brazil

Ivana Kruger Tuchtenhagen, Cláudia Liane Rodrigues de Lima, Adilson Luís Bamberg, Rachel Muylaert Locks Guimarães, Pulido-Moncada Mansonia

20/Apr/2018

ABSTRACT The “Visual Evaluation of Soil Structure” (VESS) is a method used primarily to evaluate the soil structural quality of Oxisols in Brazil and secondly for more specific research, consultancy, and teaching purposes. Since the methodology was never applied and compared with laboratory evaluations of physical properties of hydromorphic soils of the Pampa biome in the south of Brazil, this study evaluated the use of VESS as a visual indicator of the structure quality of a typic eutrophic Albaqualf soil […]

Is Structural Quality as Assessed by the “Profil Cultural” Method Related to Quantitative Indicators of Soil Physical Quality?

Rafaela Watanabe, Cássio Antonio Tormena, Maria de Fátima Guimarães, João Tavares, Ricardo Ralisch, Julio Franchini, [...]

01/Feb/2018

ABSTRACT Soil and crop management systems change the soil structure, thereby affecting soil quality. The “profil cultural” method (PCM) has been used to identify the effects of management systems on soil structure; however, few studies relate the structures identified by the PCM to quantitative indicators of soil structural quality. This study aimed to quantify soil structures using the PCM and relate these structures to bulk density (Bd), critical bulk density (Bdc), soil aeration capacity (εa), least limiting water range (LLWR), […]

Water Erosion in a Long-Term Soil Management Experiment with a Humic Cambisol

Jefferson Schick, Ildegardis Bertol, Fabrício Tondello Barbosa, David José Miquelluti, Neroli Pedro Cogo

01/Aug/2017

ABSTRACT Water erosion, the main factor in soil degradation, is strongly influenced by soil cover and management. The objective of this study was to determine soil and water losses under natural rainfall conditions from 1993 to 2012 in the southern Santa Catarina Plateau, Brazil, in 3.5 × 22.1 m plots with crops in rotation to study the following management treatments: conventional tillage (CT), minimum tillage (MT), and no-tillage (NT), and a treatment with bare soil (BS). The soil cover remaining […]

Agronomic and Economic Efficiency of Common-Bean Inoculation with Rhizobia and Mineral Nitrogen Fertilization

Bruno Lima Soares, Paulo Ademar Avelar Ferreira, Márcia Rufini, Fábio Aurélio Dias Martins, Dâmiany Pádua Oliveira, Ricardo Pereira Reis, [...]

01/Aug/2016

ABSTRACT Management of biological nitrogen fixation in common bean still requires improvement. The objective of this study was to verify the compatibility of nitrogen fertilization with biological N2 fixation to increase common bean yield and profitability. Four field experiments were performed in four municipalities of Minas Gerais, Brazil, during the 2009 and 2010 winter crop season. The 2009 crop experiments were set up under a no-till system and the 2010 crop was conducted using conventional tillage. A randomized block experimental […]

Carbon Stocks in Compartments of Soil Organic Matter 31 Years after Substitution of Native Cerrado Vegetation by Agroecosystems

Eloisa Aparecida Belleza Ferreira, Mercedes Maria da Cunha Bustamante, Dimas Vital Siqueira Resck, Cícero Célio de Figueiredo, Alexandre de Siqueira Pinto, Juaci Vitória Malaquias

13/Apr/2016

ABSTRACT Changes in carbon stocks in different compartments of soil organic matter of a clayey Latossolo Vermelho Distrófico (Typic Haplustox), caused by the substitution of native savanna vegetation (cerrado sensu stricto) by agroecosystems, were assessed after 31 years of cultivation. Under native vegetation, a stock of 164.5 Mg ha-1 C was estimated in the 0.00-1.00 m layer. After 31 years of cultivation, these changes in soil C stocks were detected to a depth of 0.60 m. In the case of […]

Physical Properties of a Hapludox after Three Decades under Different Soil Management Systems

Franciani Rodrigues da Silva, Jackson Adriano Albuquerque, André da Costa, Sandra Mara Vieira Fontoura, Cimélio Bayer and, Maria Izabel Warmling

12/Apr/2016

ABSTRACT Changes in soil physical properties due to different management systems occur slowly, and long-term studies are needed to assess soil quality. The objectives of this study were to evaluate the effects of soil management systems and liming methods on the physical properties of a Latossolo Bruno Alumínico típico (Hapludox). A long-term experiment that began in 1978 with conventional and no-tillage systems was assessed. In addition, different liming methods (no lime, incorporated lime, and lime on the soil surface) have […]

SOIL STRUCTURE UNDER IRRIGATED BEANS AND DIFFERENT SOIL MANAGEMENT PRACTICES

Lorena Adriana de Gennaro, Zigomar Menezes de Souza, Laura Fernanda Simões da Silva, Miguel Cooper, Milton César Costa Campos

01/Mar/2015

Agricultural management affects soil structure, modifying soil physical properties and soil water movement. The objective of this study was to evaluate the effects of no-tillage (NT) and conventional tillage (CT) on soil structure through physical properties and pore distribution in 2-D digital images. The study was conducted in an Oxisol with a randomized block design. Soil bulk density, soil macroporosity, mean weighted diameter (MWD), saturated hydraulic conductivity (SHC), and analysis of 2-D digital images (156.25 μm2 resolution) were evaluated at […]

SPATIAL VARIABILITY OF SORGHUM YIELD AND SOIL PROPERTIES IN THE REGION OF THE SAVANNA-WETLAND ECOTONE IN MATO GROSSO DO SUL, BRAZIL

Rafael Montanari, Elói Panachuki, Lenon Henrique Lovera, Adriany Rodrigues Correa, Israel Souza Oliveira, Hernandes Andrade Queiroz, [...]

01/Mar/2015

Sorghum bicolor (L.) Moech is an important high production forage crop that is increasingly used in Brazil, though still slow in replacing growing of second crop maize. Growing sorghum during the dry season would be an alternative for silage production and its use in the rainy season. However, plant growth and development will be affected if alterations occur in the texture, porosity, and structure of the soil. The objective of this study was to analyze the spatial variability and linear […]