Sabiia Seb
PortuguêsEspañolEnglish
Embrapa
        Busca avançada

Botão Atualizar


Botão Atualizar

Ordenar por: 

RelevânciaAutorTítuloAnoImprime registros no formato resumido
Registros recuperados: 5
Primeira ... 1 ... Última
Imagem não selecionada

Imprime registro no formato completo
Aggregate stability and penetration resistance after mobilization of a dystrocohesive Ultisol 91
Tavares,Uilka E.; Rolim,Mario M.; Simões Neto,Djalma E.; Pedrosa,Elvira M. R.; Magalhães,Adriana G.; Silva,Ênio F. de F. e.
ABSTRACT Evaluation of mobilized soil profiles can provide important information on soil compaction reduction processes. In this context, the objective of this study was to evaluate alterations in soil penetration resistance and the impact on the aggregate stability of a cohesive Ultisol cultivated with sugarcane. The experiment was carried out at the Carpina Sugarcane Experimental Station (EECAC/UFRPE), located in the city of Carpina, PE. Penetration resistance, mobilized area and depth, and percentage of soil aggregates were evaluated before and after soil tillage. Soil mobilization improved soil aggregate uniformity and decreased penetration resistance in the 0-0.20 m layer. Coarse soil fraction, moisture and organic carbon positively contributed to the...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Furrowing; Harrowing; Soil resistance.
Ano: 2017 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1415-43662017001100752
Imagem não selecionada

Imprime registro no formato completo
Avaliação de qualidade do solo no sistema ILPF (URTP Embrapa Milho e Sorgo). 14
ALBUQUERQUE FILHO, M. R. de; VIANA, J. H. M.; CLEMENTE, E. de P..
RESUMO - Os níveis de resistência à penetração do solo e a qualidade da estrutura na camada superficial foram avaliados na Unidade de Referência em sistema ILPF e no cerrado adjacente, na Fazenda Experimental da Embrapa Milho e Sorgo, em Sete Lagoas-MG. O trabalho foi realizado utilizando-se um penetrógrafo eletrônico para avaliar a resistência do solo à penetração até 60 cm de profundidade e o DRES - Diagnóstico Rápido da Estrutura do Solo para a camada de 0 a 20 cm de profundidade. Não houve diferença estatística entre a resistência à penetração no cerrado e no sistema ILPF. A camada de maior resistência no ILPF se localiza mais próxima à superfície e com densidade um pouco mais elevada, mas abaixo do limite de impedimento ao crescimento de raízes e...
Tipo: Folhetos Palavras-chave: Resistência do solo; Penetração; DRES; Penetrometria; Soil resistance; Penetrometry; Manejo do Solo; Sistema de Cultivo.
Ano: 2022 URL: http://www.infoteca.cnptia.embrapa.br/infoteca/handle/doc/1149570
Imagem não selecionada

Imprime registro no formato completo
Estimating Sample Size of Soil Cone Index Profiles by Bootstrapping 90
Alesso,Carlos Agustín; Masola,María Josefina; Carrizo,María Eugenia; Imhoff,Silvia Del Carmen.
ABSTRACT Measurements of the soil cone index are widely used to assess soil resistance to root penetration (SR) and to monitor the soil compaction status of agricultural fields. However, soil sampling for SR estimation is a rather challenging task in view of the high spatial and temporal variability of the soil. This study proposed a bootstrapping method to determine the minimum sample size required to estimate the vertical profile of mean soil cone index (CI) values at different levels of precision and confidence. For this purpose, CI data from a Typic Argiudoll under no-tillage before and after chiseling was used. A total of 151 CI profiles were recorded before and after chiseling in a 3,200 m2 (40 × 80 m) no-tillage area at sampling points distributed...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Sampling; Soil resistance; Bootstrap procedure; Soil variability.
Ano: 2017 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-06832017000100429
Imagem não selecionada

Imprime registro no formato completo
Mapping soil compaction using indicator kriging in Santa Fe province, Argentina 109
Agustín-Alesso,Carlos; Carrizo,María Eugenia; del-Carmen-Imhoff,Silvia.
Abstract Soil compaction is a complex physical process that affects the crop performance by limiting the expansion of the roots and the reduction of water and nutrients uptake from soil. Due to the spatial variability of soil compaction, the needs for remedial practices may vary within the field. However, mapping soil compaction estimated by cone index (CI) data is a difficult task. The aim of this study were to examine the spatial variability of CI data in a fine-mixed-thermic Typic Argiudoll soil form the center of Santa Fe, province -Argentina under no-till system, and to delineate zones for site-specific tillage based on maps of probabilities of occurrence of soil compaction developed using indicator kriging. Sixty nine georeferenced CI and volumetric...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Cone index; Potential site-specific tillage management zones; Soil resistance; Spatial variability; Variography.
Ano: 2017 URL: http://www.scielo.org.co/scielo.php?script=sci_arttext&pid=S0120-28122017000100081
Imagem não selecionada

Imprime registro no formato completo
Measuring mechanical impedance in clayey gravelly soils 90
Stolf,R.; Cassel,D. K.; King,L. D.; Reichardt,K..
Mechanical impedance of clayey and gravelly soils is often needed to interpret experimental results from tillage and other field experiments. Its measurement is difficult with manual and hydraulic penetrometers, which often bend or break in such soils. The purpose of this study was to evaluate the feasibility of a hand-operated "Stolf" impact penetrometer to measure mechanical impedance (soil resistance). The research was conducted in Raleigh, North Carolina, USA (35º 45'N, 78º 42'W, elevation 75 m). Corn was planted on April 19, 1991. Penetrometer measurements were taken on May 10, 1991, in 5 cm intervals to 60 cm at 33 locations on a transect perpendicular to the corn rows in each of four tillage treatments. The data permitted three-dimensional displays...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Impact penetrometer; Soil resistance; Hard clayey and gravelly soils; Spatial distribution.
Ano: 1998 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-06831998000200003
Registros recuperados: 5
Primeira ... 1 ... Última
 

Empresa Brasileira de Pesquisa Agropecuária - Embrapa
Todos os direitos reservados, conforme Lei n° 9.610
Política de Privacidade
Área restrita

Embrapa
Parque Estação Biológica - PqEB s/n°
Brasília, DF - Brasil - CEP 70770-901
Fone: (61) 3448-4433 - Fax: (61) 3448-4890 / 3448-4891 SAC: https://www.embrapa.br/fale-conosco

Valid HTML 4.01 Transitional