Consulta: subjectFacets:"Compaction"
Registros recuperados: 34
Data/hora: 09/06/2024 04:34:32

SPATIALIZATION OF SOIL RESISTANCE TO PENETRATION FOR LOCALIZED MANAGEMENT BY PRECISION AGRICULTURE TOOLS
Provedor de dados: 70
Autores: Cortez,Jorge W.; Cavassini,Victor H.; Motomiya,Anamari V. de A.; Orlando,Roberto C.; Valente,Igor Q. M.
ABSTRACT Soil resistance to penetration is an indicator of easy measurement which can be used to make scarification / subsoiling recommendations in areas that work with localized management. The objective of this study was to evaluate the spatial variability of soil resistance to penetration (RP) in the area of direct sowing system, and to carry out the recommendation of scarification / subsoiling in a localized way through precision agriculture. The research was conducted in commercial area, in a field of 49.12 ha. The RP collection was with an electronic penetrometer in a sample mesh of 47 points distributed regularly in the area, with georeferenced points. The data were analyzed every 0.10 m being collected up to 0.40 m depth, in addition to obtaining...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Compaction; Cone index; Decompaction.
Ano: 2018
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-69162018000500690

AGRONOMICAL ATTRIBUTES OF SOYBEANS AND SOIL RESISTANCE TO PENETRATION IN NO-TILLAGE AND CHISELED SURFACES
Provedor de dados: 70
Autores: Cortez,Jorge W.; Mauad,Munir; Souza,Luiz C. F. de; Rufino,Mauricio V.; Souza,Paulo H. N. de.
ABSTRACT Farming systems may affect soil properties and crop production of components, decreasing yields. This study aimed to assess penetration resistance (PR) and agronomic traits of soybeans under no-tillage (NT) and chiseling (CP). The experiment was carried out in a randomized block with two treatments (tillage and scarification) with 12 repetitions; yet soil penetration resistance (PR) was assessed in a factorial block, considering farming systems and sampling sites (row and interrows). PR was measured with an impact penetrometer, sampling in row and interrows within a 22.5 x 0.1 m2 mesh grid up to 0.60 m depth. The obtained values were higher for NT in the 0.10-0.20 m layer. Great PR values in interrows were only registered within the surface layer....
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Compaction; Soil physics; Chiseling.
Ano: 2017
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-69162017000100098

SOIL ATTRIBUTES AND INITIAL CORN DEVELOPMENT AS A FUNCTION OF FERTILIZATION AND INTERCROPPING SYSTEMS
Provedor de dados: 70
Autores: Cortez,Jorge W.; Silva,Rouverson P. da; Furlani,Carlos E. A.; Olszevski,Nelci; Nagahama,Hideo de J.
ABSTRACT Fertilization systems that allow higher sowing speeds have been used in areas of grain production, as well as the use of intercropping to improve soil physical quality and provide better soil cover. This study aimed to evaluate soil attributes and the initial corn development and intercropping (corn + velvet bean, corn + pigeonpea, and corn + bonavist bean) as a function of fertilization systems (pre-sowing and sowing). The experiment was conducted in an Oxisol in a randomized block design in the 2 × 3 factorial scheme, with four replications. The number of days for emergence, plant stand, intercropping dry matter, soil straw cover, soil straw permanence index, penetration resistance, soil moisture, soil density, degree of compaction, and total...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Compaction; Vegetation cover; Soil physical quality.
Ano: 2019
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-69162019000200257

Static tests of constructive tires using hydraulic press on the soil
Provedor de dados: 70
Autores: Machado,Thiago M.; Lanças,Kléber P.; Oliveira Junior,Mauro B. de; Artioli,José A.; Marasca,Indiamara.
ABSTRACT The power consumption and load capacity of agricultural machines have grown and the effects of pressure on the soil by tires have been still little investigated. In concern with sustainable development, the relationship machine-tire-soil must be in balance to give more consistency on the best use of tires for a given load. This study aimed to evaluate four tires of two constructive types, the bias belted tires and radial tires, both with respective rim diameters of 22.5 and 26.5 inches with variables measuring the footprint, elastic deformation, sinkage and resistance to penetration. A hydraulic press with an attachment shaft for tire mounting and a box of soil in which the tire has been imposed on a load of 53.00 kN using nominal pressures...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Compaction; Footprint; Pressure; Elastic deformation; Sinkage.
Ano: 2015
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-69162015000500886

DYNAMIC OF PRESSURE-DEFORMATION CURVE IN UNIAXIAL COMPRESSION TEST IN DIFFERENT LOAD TIMES
Provedor de dados: 70
Autores: Mazurana,Michael; Levien,Renato; Zulpo,Lucas; Passos,Gabrielle M.; Kerpen,Hyran S.
ABSTRACT: The loading application time by machinery tires and agricultural tires is one of the factors of soil compaction. We evaluated the effect of loading reduction time in uniaxial compression test, in laboratory, in some physical and mechanical parameters, approaching the loading field condition time by machinery with laboratory tests. Soil samples of two Oxisol and one Paleudult under different years of implementation of no tillage system (NT) and of different layers were collected and subjected to uniaxial compression tests, two times of loading application, 300 seconds per load, according to actual methodology and 30 seconds per load in the laboratory. We analyzed the soil deformation to each load, bulk density, pre-compression stress, recompress...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Loading bearing support; Compaction; Recompression index.
Ano: 2017
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-69162017000500973

Soil penetration resistance analysis by multivariate and geostatistical methods
Provedor de dados: 70
Autores: Medina,Cecilia; Camacho-Tamayo,Jesús H.; Cortés,César A.
The penetration resistance (PR) is a soil attribute that allows identifies areas with restrictions due to compaction, which results in mechanical impedance for root growth and reduced crop yield. The aim of this study was to characterize the PR of an agricultural soil by geostatistical and multivariate analysis. Sampling was done randomly in 90 points up to 0.60 m depth. It was determined spatial distribution models of PR, and defined areas with mechanical impedance for roots growth. The PR showed a random distribution to 0.55 and 0.60 m depth. PR in other depths analyzed showed spatial dependence, with adjustments to exponential and spherical models. The cluster analysis that considered sampling points allowed establishing areas with compaction problem...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Compaction; Cluster analysis; Principal components; Andisol.
Ano: 2012
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-69162012000100010

Changes in water availability in the soil due to tractor traffic
Provedor de dados: 70
Autores: Gómez-Rodríguez,Katherine; Camacho-Tamayo,Jesús H.; Vélez-Sánchez,Javier E.
Frequent traffic of tractors in agricultural soils, promotes soil compaction and affects the flow and water availability. The aim of this research was to study the effect of compaction induced by tractor traffic on water availability in the soil under different traffic intensities on the same path (0, 1, 3, 6 and 10 passages), to two tractors with 3.3 and 2.6 ton of weights, over three different surface conditions. The study was conducted in an Andisol, representative soil of the study area. It was determined the behavior of the water retention curve, obtaining the gravitational water, available water and hygroscopic water, to 10 and 30 cm of depth. The hygroscopic water is the most prevalent with values ​​of up to 80% of the total water present in the...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Compaction; Soil management; Water retention curve; Andisol.
Ano: 2013
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-69162013000600008

GPS receivers for georeferencing of spatial variability of soil attributes
Provedor de dados: 70
Autores: Rosalen,David L; Rodrigues,Marcos S; Chioderoli,Carlos A; Brandão,Flavia J. C; Siqueira,Diego S.
The characterization of the spatial variability of soil attributes is essential to support agricultural practices in a sustainable manner. The use of geostatistics to characterize spatial variability of these attributes, such as soil resistance to penetration (RP) and gravimetric soil moisture (GM) is now usual practice in precision agriculture. The result of geostatistical analysis is dependent on the sample density and other factors according to the georeferencing methodology used. Thus, this study aimed to compare two methods of georeferencing to characterize the spatial variability of RP and GM as well as the spatial correlation of these variables. Sampling grid of 60 points spaced 20 m was used. For RP measurements, an electronic penetrometer was used...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Precision agriculture; GNSS; Compaction; Soil water content.
Ano: 2011
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-69162011000600013

Soil properties and agronomic attributes of potato grown under deep tillage in succession of grass species
Provedor de dados: 75
Autores: Costa,Cristiano FA; Melo,Paulo CT; Guerra,Henrique P; Ragassi,Carlos F.
ABSTRACT Yield and disease incidence were evaluated in potato (Solanum tuberosum, cv. Atlantic) after six years of cultivation in succession with corn (Zea mays, cv. ‘AG 6080’) under conventional tillage (CT, depth of tillage: 20 cm) or in succession with three grass species [Guinea grass (Panicum maximum, cv. Tanzânia), Palisade grass (Brachiaria brizantha, cv. Marandu) and corn] under deep tillage (DT, depth of tillage: 70 cm). Total tuber yield was higher in DT in average 36% the value obtained in CT (17.76 t/ha), with no effect of the grass species. Common scab (Streptomyces scabies) incidence was influenced by treatments, the highest (16.9%) and the lowest (9.5%) values being obtained in succession with corn and Guinea grass, respectively, both under...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Solanum tuberosum; Compaction; Soil recuperation; Crop succession.
Ano: 2017
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0102-05362017000100075

Rate of soil egestion by larvae of Hylamorpha elegans (Burm.) and Phytoloema hermanni Germ. (Coleoptera: Scarabaeidae)
Provedor de dados: 82
Autores: Millas,Paz; Carrillo,Roberto.
Larvae of Hylamorpha elegans (Burm.) and Phytoloema herrmanni Germ. feed on roots, although many Scarabaeidae species are able to feed and survive on soil without living roots. In this study we evaluated the potential of H. elegans and P. herrmanni to ingest soil by estimating the rate of soil egestion. In the laboratory, the rate of soil egestion was determined from gut content and gut transit time of 3rd-instar larvae feeding on soil without roots. The soil egestion rate was 14-21 mg g-1 d-1 for H. elegans and 11-16 mg g-1 d-1 for P. herrmanni. The gut transit time (time of soil passage from mouth to anus) was 2-3 d for both species and the gut content was 41 ± 2 mg g-1 for H. elegans and 32 ± 2 mg g-1 for P. herrmanni. The quantitative importance of...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Ingest; Compaction; White grub.
Ano: 2010
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1519-566X2010000500004

Avaliation of the soil preparation quality in minimum cultivation area planted with eucalypt
Provedor de dados: 190
Autores: Gava, José Luiz.
Evaluations, of the quality of soil preparation in the plantation lines, were made in areas with potential risk of compaction using the penetrometer to collect data about the depth and width of the furrow. The samplings were made in three sites of production of Eucalyptus in areas of Cia Suzano de Papel e Celulose in the state of São Paulo, managed under minimum cultivation of the soil and where crop was mechanized and intensive. The statistical evaluation of the quality was made through the measurement and assessment of the results of the soil preparation, comparing the results with the technical quality standards pre-established by the company. The data were analyzed graphically and statistically. In the graphic analysis of the three sites sampled, the...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Quality control; Compaction; Soil preparation; Sub soiling Controle de qualidade; Compactação; Preparo de solo; Subsolagem.
Ano: 2003
URL: http://pfb.cnpf.embrapa.br/pfb/index.php/pfb/article/view/1608

Winter pasture and cover crops and their effects on soil and summer grain crops
Provedor de dados: 86
Autores: Balbinot Junior,Alvadi Antonio; Veiga,Milton da; Moraes,Anibal de; Pelissari,Adelino; Mafra,Álvaro Luiz; Piccolla,Cristiano Dela.
The objective of this work was to evaluate the effect of winter land use on the amount of residual straw, the physical soil properties and grain yields of maize, common bean and soybean summer crops cultivated in succession. The experiment was carried out in the North Plateau of Santa Catarina state, Brazil, from May 2006 to April 2010. Five strategies of land use in winter were evaluated: intercropping with black oat + ryegrass + vetch, without grazing and nitrogen (N) fertilization (intercropping cover); the same intercropping, with grazing and 100 kg ha-1 of N per year topdressing (pasture with N); the same intercropping, with grazing and without nitrogen fertilization (pasture without N); oilseed radish, without grazing and nitrogen fertilization...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Compaction; Cover crops; Crop-livestock integration; No-tillage; Organic carbon.
Ano: 2011
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-204X2011001000032

Litter materials and the incidence of carcass lesions in broilers chickens
Provedor de dados: 89
Autores: Garcia,RG; Almeida Paz,ICL; Caldara,FR; Nääs,IA; Bueno,LGF; Freitas,LW; Graciano,JD; Sim,S.
The aim of this study was to evaluate the effects of different litter materials on litter compaction, broiler feathering and the incidence of carcass lesions. In the experiment, 3240 one-day-old Ross® chicks were selected by sex and distributed according to a completely randomized experimental design in a 2 x 6 factorial arrangement (two sex and six litter materials). The following litter materials were used: wood shavings, rice husks, chopped Napier grass, 50% sugar cane bagasse plus 50% wood shavings, 50% sugar cane bagasse plus 50% rice husks, and pure sugar cane bagasse. Litter compaction was weekly assessed using a penetrometer. On days 21, 35 and 42 of the experimental period, feathering on the back and legs was scored according to a 0 - 10 scale. On...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Compaction; Fathering; Quality; Substrate.
Ano: 2012
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-635X2012000100005

Compared performance of penetrometers and effect of soil water content on penetration resistance measurements
Provedor de dados: 90
Autores: Mome Filho,Edison Aparecido; Silva,Alvaro Pires da; Figueiredo,Getulio Coutinho; Gimenes,Fernando Henrique Setti; Vitti,André Cesar.
Modern agriculture techniques have a great impact on crops and soil quality, especially by the increased machinery traffic and weight. Several devices have been developed for determining soil properties in the field, aimed at managing compacted areas. Penetrometry is a widely used technique; however, there are several types of penetrometers, which have different action modes that can affect the soil resistance measurement. The objective of this study was to compare the functionality of two penetrometry methods (manual and automated mode) in the field identification of compacted, highly mechanized sugarcane areas, considering the influence of soil water volumetric content (θ) on soil penetration resistance (PR). Three sugarcane fields on a Rhodic Eutrudrox...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Sugarcane; Mechanization; Compaction; Soil water content.
Ano: 2014
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-06832014000300006

Reclamation of a Degraded Coal-Mining Area with Perennial Cover Crops
Provedor de dados: 90
Autores: Pauletto,Eloy Antonio; Stumpf,Lizete; Pinto,Luiz Fernando Spinelli; Silva,Tiago Stumpf da; Ambus,Jordano Vaz; Garcia,Gabriel Furtado; Dutra Junior,Leonir Aldrighi; Scheunemann,Tiago; Albert,Renata Pinto.
ABSTRACT: Studies addressing the potential of grass roots in improving the structural quality of constructed minesoils are not frequent in the literature, although they are essential for understanding the re-establishment of soil functions in the environment. The objective of this study was to quantify the root attributes of the species Urochloa humidicola, Panicum maximum, and Urochloa brizantha and relate them to the physical properties of a constructed minesoil in reclamation of an area degraded by coal mining. The study was performed in a field experiment in a coal mining area located in southern Brazil. Soil samples were collected, five years after experiment installation, to determine bulk density, macroporosity, distribution of water stable...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Minesoil; Monoliths; Compaction.
Ano: 2016
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-06832016000100550

Physical Properties of Soil Structures Identified by the Profil Cultural under Two Soil Management Systems
Provedor de dados: 90
Autores: Macedo,Sônia de Fátima Schilickmann; Grimaldi,Michel; Medina,Cristiane Conti; Cunha,José Edézio da; Guimarães,Maria de Fátima; Tavares Filho,João.
ABSTRACT Soil structure plays an important role in water retention, infiltration capacity, porosity, and penetration resistance. The aim of this study was to evaluate the unsaturated hydraulic conductivity and physical properties of Oxisol soils (bulk density and macro-, micro-, and total porosity) in the structures identified using the profil cultural method in areas under two different management practices (perennial pasture and sugarcane). Three pits were dug in each plot to find out how homogeneous morphological structural units (HMSU) were organized in the soil. Next, unsaturated hydraulic conductivity (Ki) was measured in situ inside each HMSU using a triple-ring infiltrometer at multiple suction. Six samples were collected (two samples for each kind...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Soil use; Compaction; Soil bulk density; Soil porosity.
Ano: 2017
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-06832017000100524

Implications of the variability in soil penetration resistance for statistical analysis
Provedor de dados: 90
Autores: Gubiani,Paulo Ivonir; Reichert,José Miguel; Reinert,Dalvan José; Gelain,Neiva Somavilla.
Soil penetration resistance (PR) is a measure of soil compaction closely related to soil structure and plant growth. However, the variability in PR hampers the statistical analyses. This study aimed to evaluate the variability of soil PR on the efficiency of parametric and nonparametric analyses in indentifying significant effects of soil compaction and to classify the coefficient of variation of PR into low, medium, high and very high. On six dates, the PR of a typical dystrophic Red Ultisol under continuous no-tillage for 16 years was measured. Three tillage and/or traffic conditions were established with the application of: (i) no chiseling or additional traffic, (ii) additional compaction, and (iii) chiseling. On each date, the nineteen PR data...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Compaction; Coefficient of variation; Normality.
Ano: 2011
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-06832011000500003

Modelling of soil penetration resistance for an oxisol under no-tillage
Provedor de dados: 90
Autores: Tavares Filho,João; Feltran,Clarissa Tieme Matsuda; Oliveira,José Francirlei de; Almeida,Edinei de.
Soil penetration resistance is an important property that affects root growth and elongation and water movement in the soil. Since no-till systems tend to increase organic matter in the soil, the purpose of this study was to evaluate the efficiency with which soil penetration resistance is estimated using a proposed model based on moisture content, density and organic matter content in an Oxisol containing 665, 221 and 114 g kg-1 of clay, silt and sand respectively under annual no-till cropping, located in Londrina, Paraná State, Brazil. Penetration resistance was evaluated at random locations continually from May 2008 to February 2011, using an impact penetrometer to obtain a total of 960 replications. For the measurements, soil was sampled at depths of 0...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: No-till; Compaction; Physical properties; Organic matter.
Ano: 2012
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-06832012000100010

Revisiting the S-index for soil physical quality and its use in Brazil
Provedor de dados: 90
Autores: Jong van Lier,Quirijn de.
The S-index was introduced in 2004 in a publication by A.R. Dexter. S was proposed as an indicator of soil physical quality. A critical value delimiting soils with rich and poor physical quality was proposed. At present, Brazil is world leader in citations of Dexter's publication. In this publication the S-theory is mathematically revisited and extended. It is shown that S is mathematically correlated to bulk density and total porosity. As an absolute indicator, the value of S alone has proven to be incapable of predicting soil physical quality. The critical value does not always hold under boundary conditions described in the literature. This is to be expected because S is a static parameter, therefore implicitly unable to describe dynamic processes. As a...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Porosity; Density; Water retention curve; Compaction.
Ano: 2014
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-06832014000100001

Soil physical properties and sugarcane root growth in a red oxiso
Provedor de dados: 90
Autores: Baquero,José Euripides; Ralisch,Ricardo; Medina,Cristiane de Conti; Tavares Filho,João; Guimarães,Maria de Fátima.
Sugarcane, which involves the use of agricultural machinery in all crop stages, from soil preparation to harvest, is currently one of the most relevant crops for agribusiness in Brazil. The purpose of this study was to investigate soil physical properties and root growth in a eutroferric red Oxisol (Latossolo Vermelho eutroférrico) after different periods under sugarcane. The study was carried out in a cane plantation in Rolândia, Paraná State, where treatments consisted of a number of cuts (1, 3, 8, 10 and 16), harvested as green and burned sugarcane, at which soil bulk density, macro and microporosity, penetration resistance, as well as root length, density and area were determined. Results showed that sugarcane management practices lead to alterations...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Saccharum spp; Compaction; Monoculture.
Ano: 2012
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-06832012000100007

Estimation of precompression stress in an Ultisol cultivated with sugarcane
Provedor de dados: 91
Autores: Mendes,Pericles M. B.; Rolim,Mário M.; Lima,Renato P. de; Pedrosa,Elvira M. R.; Tavares,Uilka E.; Simões Neto,Djalma E.
ABSTRACT Compressive soil properties are typically used for the understanding of compaction process. As an alternative to laboratory tests, pedo-transfer functions have been used to estimate the mechanical behaviour of soil as a function of soil physical parameters. The impact of soil bulk density (BD) and gravimetric water content (w) was examined on soil strength and pedo-transfer functions were proposed to predict the precompression stress (σp) in an Ultisol cultivated with sugarcane. Undisturbed soil cores were sampled at the depths of 0-0.20 and 0.20-0.40 m, subjected to different water contents, and subsequently, compression tests were performed to determine σp. The data were subjected to analysis of variance and regression analysis. Bulk density and...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Compaction; Soil compressibility; Coastal tablelands.
Ano: 2019
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1415-43662019000500336

Soybean development as a function of traffic of tractor with radial tires
Provedor de dados: 91
Autores: Espessato,Renan R.; Leite,Fabrício; Guerreiro,Julio C.; Quiqui,Erci M. Del; Azevedo,Ana P. de; Aleixo,Edward V.
ABSTRACT This study aimed to evaluate the development of soybean as a function of traffic levels of an agricultural tractor equipped with radial tires in two collection areas. The experiment was conducted in an area located at the State University of Maringá, Campus of Umuarama-PR, Brazil, in a soil classified as Red Oxisol with sandy texture. The experiment was set in a 5 x 2 factorial arrangement, with five levels of traffic on the same track (T1 = 1, T2 = 6, T3 = 11, T4 = 16 and T5 = 21 tractor passes), two collection areas (A1 = on the track and A2 = off the track) and four replicates. Soil physical parameters and characteristics of the soybean plants were evaluated. Soybean yield on the track did not show significant difference up to 6 passes. It was...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Glycine max L.; Compaction; Machine traffic.
Ano: 2017
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1415-43662017001000726

Particle passage kinetics and neutral detergent fiber degradability of silage of pineapple waste (aerial parts) under different packing densities
Provedor de dados: 96
Autores: Caetano,Graciele Araújo de Oliveira; Villela,Severino Delmar Junqueira; Oliveira,Margarida Maria Nascimento Figueiredo de; Leonel,Fernando de Paula; Tamy,Wagner Pessanha.
The objective of this study was to determine the kinetics of in situ degradability parameters of the dry matter (DM) and neutral detergent fiber (NDF) and the passage of materials originating from the ensilage of the waste from pineapple cultivation (aerial parts). The four treatments utilized were silage of pineapple waste compacted at 600, 700, 900 and 1000 kg/m³. After ensiling the material from the pineapple cultivation, the particle-transit and rumen-degradation kinetics were analyzed. For the analysis of particle transit, chromium was utilized as a marker to mark the fiber. Passage rates were determined by retrieving the markers in the feces of the animals. In the degradation assay, samples were incubated in nylon bags for 0, 6, 18, 48 and 96 hours....
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Compaction; Mean retention time in the rumen; Pineapple silage; Rumen fill.
Ano: 2014
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-35982014000100008

Soil morphostructural characterization and coffee root distribution under agroforestry system with Hevea Brasiliensis
Provedor de dados: 63
Autores: Nunes,Amanda Letícia Pit; Cortez,Glassys Louise de Souza; Zaro,Geovanna Cristina; Zorzenoni,Thiago Ometto; Melo,Thadeu Rodrigues de; Figueiredo,Alex; Aquino,Gisele Silva de; Medina,Cristiane de Conti; Ralisch,Ricardo; Caramori,Paulo Henrique; Guimarães,Maria de Fátima.
ABSTRACT: Land use and tillage practices may change soil structure and undermine sustainable agriculture; however, such changes are hardly identified in the short term. In this sense, agroforestry systems have been used to reduce soil degradation and promote sustainable production in coffee plantations. These areas are expected to have well-structured soils and hence improved root distribution. This study aimed to evaluate soil quality by the morphostructural and root distribution analyses comparing open-grown coffee and coffee in agroforestry systems with rubber trees for 19 years, in an Oxisol in northern Paraná State (Brazil). Treatments consisted of open-grown coffee (OG), coffee partially shaded by rubber trees (PSH), and coffee fully shaded by rubber...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Cultural profile; Soil physics; Compaction; Penetrometry; Rubber treepoint of zero charge.
Ano: 2021
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162021000601401

Spatial prediction of soil penetration resistance using functional geostatistics
Provedor de dados: 63
Autores: Cortés-D,Diego Leonardo; Camacho-Tamayo,Jesús Hernán; Giraldo,Ramón.
ABSTRACT Knowledge of agricultural soils is a relevant factor for the sustainable development of farming activities. Studies on agricultural soils usually begin with the analysis of data obtained from sampling a finite number of sites in a particular region of interest. The variables measured at each site can be scalar (chemical properties) or functional (infiltration water or penetration resistance). The use of functional geostatistics (FG) allows to perform spatial curve interpolation to generate prediction curves (instead of single variables) at sites that lack information. This study analyzed soil penetration resistance (PR) data measured between 0 and 35 cm depth at 75 sites within a 37 ha plot dedicated to livestock. The data from each site were...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Functional Kriging; Compaction; Spatial variability; Functional data.
Ano: 2016
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162016000500455

Planosol soil sample size for computerized tomography measurement of physical parameters
Provedor de dados: 63
Autores: Pedrotti,Alceu; Pauletto,Eloy Antonio; Crestana,Silvio; Cruvinel,Paulo Estevão; Vaz,Carlos Manoel Pedro; Naime,João de Mendonça; Silva,Alvaro Macedo da.
Computerized tomography (CT) is an important tool in Soil Science for noninvasive measurement of density and water content of soil samples. This work aims to describe the aspects of sample size adequacy for Planosol (Albaqualf) and to evaluate procedures for statistical analysis, using a CT scanner with a 241Am source. Density errors attributed to the equipment are 0.051 and 0.046 Mg m-3 for horizons A and B, respectively. The theoretical value for sample thickness for the Planosol, using this equipment, is 4.0 cm for the horizons A and B. The ideal thickness of samples is approximately 6.0 cm, being smaller for samples of the horizon B in relation to A. Alternatives for the improvement of the efficiency analysis and the reliability of the results obtained...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Lowland; Albaqualf; Bulk density; Compaction; Soil moisture.
Ano: 2003
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162003000400019

Influence of compaction of a forest soil on the soil fauna in a subtropical region: I. Oribatei (Acari, Cryptostigmata) and Collembola (Insecta)
Provedor de dados: 104
Autores: Ushiwata,Cláudio T; Sautter,Klaus Dieter; Kobiyama,Masato.
An experiment to observe some changes of composition and population of Oribatei and Collembola was carried out on a Cambicsoil covered with Pinus taeda L. (Pinaceae). This study area is located on the Canguiri Experimental Station Center, Universidade Federal do Paraná, 20km north to Curitiba city, Brazil. The climate of the area is subtropical. The observations resulted in a conclusion that the compaction strongly changes the structure of edaphic mesofauna community as the consequence of the modification of physical properties of soils.
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Oribatei; Collembola; Compaction; Subtropical region.
Ano: 1995
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0101-81751995000400018

Empirical Model of a Vertisol Evaporation as Tool for Management of Soil Practicability using Portable Lysimetric Station under Arid Land Context
Provedor de dados: 111
Autores: El Aissaoui, Abdellah; Yassine, Almasmoudi.
Soil compaction caused by traffics is commonly considered as one of the major’s problems in agriculture. Moisture content have a significant effect on amplifying soil compaction. This study aims to approach evaporation trend of a vertisol (40.47% clay, 39.30% loam and 20.23% sand) having an organic matter content of 1.5% in order to manage timing of its plasticity as a determinant factor inducing compaction created by the traffic of machines. A portable lysimetric measurement system was developed to evaluate soil evaporation trend. An empirical soil evaporation model was developed using three measurement campaigns according to different temperature and irradiance behaviors. Soil moisture content was evaluated with two sensors using conductivity and...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Evaporation; Vertisol; Practicability; Compaction; Lysimeter; Plasticity state; Moisture Content; Sensor.
Ano: 2023
URL: http://www.cigrjournal.org/index.php/Ejounral/article/view/6153

Effect of different tillage and residue management practices on growth and yield of corn cultivation in Thailand
Provedor de dados: 111
Autores: Sornpoon, Wlaiwan; Jayasuriya, Hemantha P. W.
The tillage and residue management during soil bed preparation need to be in appropriate manner for sustainable farming practice.  The effects of tillage and residue management methods on corn cropping were studied on loamy soil in Bangrakum district, Phitsanulok Province, Thailand.  The effects of five commonly used tillage methods: subsoiler tillage (ST), three methods of conventional tillage (CT1, CT2 and CT3), no-tillage (NT), as main factors and two corn residue management methods; burned (R1) and unburned (R2), as sub-factors were studied in a randomized strip plot configuration.  Tillage treatment showed significant effect on physical and chemical soil properties, plant growth and development, grain yield, total aboveground biomass and most...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Agricultural Engineering; Tillage optimization Tillage; No-tillage; Emergence; Compaction; Subsoiler; Biomass.
Ano: 2013
URL: http://www.cigrjournal.org/index.php/Ejounral/article/view/2235

Evaluation of corn planter under travel speed, working depth, pressure wheel and cone index
Provedor de dados: 111
Autores: Khodaei, Mehdi.
Compaction is one of the restricting factors in desirable seed germination and root growth. As a sign for soil compaction can be a criterion for optimal seed germination. Seeds require some compression of the surrounding soil at planting for optimum growth, which it is made by pressure wheels in planters. Travel speed and working depth affect the soil cone index. A field experiments were conducted to evaluate the effects of the speed and working depth in the beginning of the autumn season. Experiments were performed in the form of factorial split-plot based on a randomized complete block design with two factors, the travel speed (3, 4, and 6 km/h) and working depth (3, 6, 9, 12 and 15 cm) in three replication. Digital cone Penetrometer was used for...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Compaction; Cone index; Corn planter; Depth; Moving speed; Pressure wheel.
Ano: 2015
URL: http://www.cigrjournal.org/index.php/Ejounral/article/view/3364

Interpretation of the stiffness and permeability of Sand-Kaolin mixtures in the framework of homogenization
Provedor de dados: 42
Autores: Boutin,Claude; Kacprzak,Gregory; Doanh,Thiep.
This study deals with the behaviour of mixtures of sand and saturated kaolin paste considered as composite materials made of permeable and deformable (with non-linear behaviour) matrix (the kaolin paste) with rigid and impervious inclusions (the sand grains). Oedometric and permeability tests conducted on such mixtures highlight the key role of the state of the clay paste, and show the existence of a threshold of sand grain concentration above which a structuring effect influences both modulus and permeability. At the light of these experiments, the usual and tangent homogenization process (with simplifying assumptions to make the problem manageable) has been applied to estimate the mixture permeability and tangent compressibility. Qualitative and...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Homogenization; Non-linear behaviour; Sand-clay mixtures; Permeability; Tangent modulus; Compaction; Hardening.
Ano: 2010
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652010000100017

Pore system changes of damaged Brazilian oxisols and nitosols induced by wet-dry cycles as seen in 2-D micromorphologic image analysis
Provedor de dados: 42
Autores: Pires,Luiz F.; Reichardt,Klaus; Cooper,Miguel; Cássaro,Fabio A.M.; Dias,Nivea M.P.; Bacchi,Osny O.S.
Soil pore structure characterization using 2-D image analysis constitutes a simple method to obtain essential information related to soil porosity and pore size distribution (PSD). Such information is important to infer on soil quality, which is related to soil structure and transport processes inside the soil. Most of the time soils are submitted to wetting and drying cycles (W-D), which can cause important changes in soils with damaged structures. This report uses 2-D image analysis to evaluate possible modifications induced by W-D cycles on the structure of damaged soil samples. Samples of three tropical soils (Geric Ferralsol, GF; Eutric Nitosol, EN; and Rhodic Ferralsol, RF) were submitted to three treatments: 0WD, the control treatment in which...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Soil bulk density; Soil water content; Soil porosity; Micromorphology; Soil structure; Compaction.
Ano: 2009
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652009000100016

Effect of drying methods on the powder and compaction properties of microcrystalline cellulose derived from Gossypium herbaceum
Provedor de dados: 60
Autores: Nwachukwu,Nkemakolam; Ofoefule,Sabinus Ifeanyi.
The effect of drying method, a process variable, on the powder and compaction properties of microcrystalline cellulose (MCC) obtained from the partial acid hydrolysis of bleached alpha (α) cellulose content of matured linters of Gossypium herbaceum (GH) was investigated. A portion of the wet MCC obtained was fluid bed dried at 60 ± 1 ºC, inlet air of 30 m3 min-1 for 3 h (coded MCC-GossF). The second portion was lyophilized at - 45 ± 2 ºC for 6 h (coded MCC-GossL). The physicochemical, scanning electron micrographs, X ray diffraction patterns and micromeritic properties of the derived MCCs were determined using standard methods. The cohesiveness and compactibility of the powders were investigated using Kawakita model while the deformation and...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Gossypium herbaceum; Powder; Compaction; Drying methods; Microcrystalline cellulose.
Ano: 2020
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1984-82502020000100581

Field Performance of a Winged Scarifier as a Function of Soil Compaction and Water Content
Provedor de dados: 117
Autores: Cholaky,Carmen; Cisneros,José M; Balbuena,Roberto.
Initial soil conditions, operational aspects, and tool shape affect the efficiency of soil decompaction. The objective of this study was to evaluate the performance of a winged scarifier as a function of soil compaction and edaphic water content. The experiment was carried out in a typical Hapludoll. Treatments considered two soil compaction levels: high (HC) and low compaction (LC); and three soil water contents: wet (WS), humid (HS), and dry (DS) with 9, 14, and 19% gravimetric water content, respectively. A split-plot randomized block design was applied. Tractive effort, disturbed area, tillage depth, specific resistance, and power were evaluated. Results showed that tractive effort was 17% greater in HC than LC, and in both cases HS was greater than WS...
Tipo: Journal article
Palavras-chave: Agricultural engineering; Winged scarifier; Bulk density; Water content; Compaction.
Ano: 2010
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-58392010000100016