Silty Soils
Mostrando 1-12 de 23 artigos, teses e dissertações.
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1. Use of urease inhibitors to reduce ammonia volatilization in Amazonian soils
Resumo: O objetivo deste trabalho foi avaliar inibidores de urease quanto à redução de perdas por volatilização de amônia proveniente da ureia, em solos da Amazônia. O experimento foi realizado em um Latossolo Amarelo de textura muito argilosa, em um Latossolo Vermelho de textura argilosa, e em um Plintossolo Argilúvico de textura franco-siltosa. Cad
Pesq. agropec. bras.. Publicado em: 04/07/2019
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2. Water retention curve to analyze soil structure changes due to liming
Abstract: Liming can influence crop growth by altering pore geometry, pore size distribution and water retention characteristics in acid soils. The aim of this work is to determine liming effects on the soil structure based on analysis of water retention data using a cubic spline adjustment function. For that, the authors investigated the effect of three lim
An. Acad. Bras. Ciênc.. Publicado em: 03/06/2019
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3. MULTIVARIATE ANALYSIS OF PEANUT MECHANIZED HARVESTING
ABSTRACT The peanuts harvesting mechanization is affected by the soil physical characteristics and it may increase the losses due to the production of pods in subsurface. The objective of the experiment was to identify the clusters through multivariate exploratory approaches from similarity in six soil textures (very clayey, clayey, silty clayey loam, clayey
Eng. Agríc.. Publicado em: 2018-04
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4. Geochemical Signature of Amazon Tropical Rainforest Soils
ABSTRACT: Evaluating soil geochemical diversity in the Amazon Basin has been a challenge largely because most study sites have been at the edge of the basin and it is difficult to get samples in such a region. Here we show that even among the most weathered soils, physicochemical soil properties express lithology. Our results are based on topsoil samples col
Rev. Bras. Ciênc. Solo. Publicado em: 15/02/2018
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5. Aging simulation of the tailings from Stava fluorite extraction by exposure to gamma rays
Abstract Tailings storage facilities are disposal systems for storing the waste products of the mining industry consisting of a slurry mixture made of soil, rock and water that remain after the mineral values have been removed from the patent ore. Tailings dams are supposed to last forever, so after their deposition, tailings can experience aging processes w
REM, Int. Eng. J.. Publicado em: 2017-12
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6. Aggregation agents and structural stability in soils with different texture and organic carbon contents
The flat pampas in the state of Santa Fe in Argentina have soils with high silt content, variable carbon content, and diverse degrees of structural degradation. Aggregate stability has been used as an indicator of the structural condition of the soil. This study aimed to quantify the effect of the addition of crop residues and root activity on the agents of
Sci. agric. (Piracicaba, Braz.). Publicado em: 2015-02
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7. Influência da velocidade de rotação da mini-palheta na resistência de um solo siltoso / Influence of the mini-vane test rotation rate on the strength of a silty soil
O problema da disposição de resíduos de mineração e a ruptura de barragens de rejeitos preocupa engenheiros e órgãos ambientais nacionais e internacionais. Estes materiais possuem características geotécnicas distintas dos geomateriais encontrados em depósitos naturais, têm granulometria predominantemente siltosa e condutividade hidráulica interme
Publicado em: 2011
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8. Comportamento de estacas escavadas de pequeno diâmetro em solo laterítico e colapsível da região de Campinas/SP / Behavior of bored piles of small diameter in collapsible and lateritic soil in the region of Campinas/SP
This paper aims to study the behavior of bored piles of small diameters, subjected to axial compression loads by static load tests carried out at the Field of Experimental Soil Mechanics and Foundation 2 at Unicamp. The CEMSF2 has a geological profile whose first layer is composed of silty clay, with coluvionar, lateritic, and collapsible features.This study
Publicado em: 2011
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9. MODELAGEM DO DESEMPENHO EM TRAÇÃO DE CONJUNTOS MECANIZADOS VISANDO AO DIMENSIONAMENTO DO TRATOR / MODELLING OF THE DEMAND OF TRACTION OF MECAHNIZED GROUPS FOR SIZING OF THE TRACTOR
In pursuit of knowledge about the performance of agricultural tractors on the market and make the appropriate selection of attachments for each tractor, the research has presented mathematical models as an important tool in the representation of the traction performance of tractors. But that, however, Brazilian researchers found as the main limitation in app
Publicado em: 2010
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10. Curvas de retenção de agua de um solo coluvionar de Campinas obtidas mediante tecnicas de laboratorio e de campo / Soil water characteristic curve of a colluvial soil determined by techniques laboratory and field
This research focuses in to determine the relationship of moisture content (or degree of saturation) versus the value of the suction matrix, known as soil water characteristic curve (SWCC), to the soil surface layer of the Field Experimental of Soil Mechanics and Foundation of UNICAMP. This profile consists of colluvial, lateritic, porous, on condition unsat
Publicado em: 2008
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11. Análise do comportamento de estacas strauss submetidas a carregamento horizontal no solo da região de Londrina - PR
In Londrina city, Strauss piles are frequently used as retaining structure for building basement excavation, being submitted to horizontal load. However, the projects of such retaining structures are usually conducted using design methods that do not take the concrete cracking of pile transversal section and the properties of lateritic tropical soil into acc
Publicado em: 2008
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12. Compactação de solos: influência de métodos e de parâmetros de compactação na estrutura dos solos / Soil compaction: influence of compaction methods and compaction parameters in soils structure
Commonly, compaction of soil specimens in laboratory is processed by dynamic (Proctor test) or static (application of constant tension to the soil) compaction tests, being common to associate similar compaction curves to both procedures. However, data from studies developed in the Civil Engineering Laboratory of the Universidade Federal de Viçosa, Viçosa,
Publicado em: 2007