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A simplified Excel® algorithm for estimating the least limiting water range of soils Scientia Agricola
Leão,Tairone Paiva; Silva,Alvaro Pires da.
The least limiting water range (LLWR) of soils has been employed as a methodological approach for evaluation of soil physical quality in different agricultural systems, including forestry, grasslands and major crops. However, the absence of a simplified methodology for the quantification of LLWR has hampered the popularization of its use among researchers and soil managers. Taking this into account this work has the objective of proposing and describing a simplified algorithm developed in Excel® software for quantification of the LLWR, including the calculation of the critical bulk density, at which the LLWR becomes zero. Despite the simplicity of the procedures and numerical techniques of optimization used, the nonlinear regression produced reliable...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Nonlinear regression; Spreadsheet software; Optimization; Soil physics; Soil quality.
Ano: 2004 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162004000600013
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Adjustment of the expedite method for clay content determination in Rondônia soils Ciência Rural
Schlindwein,Jairo André; Miotti,Alan Antonio; Fioreli-Perira,Elaine Cosma; Pequeno,Petrus Luiz de Luna; Bortolon,Leandro; Marcolan,Alaerto Luiz.
Soil clay content is an important soil attribute and has been used to classification of phosphorus status in the soil in order to determinate the needing of phosphorus amounts to be applied to crops production. The aim of this research was to adjust the method for soil clay content determination, adopted by the laboratories of Southern Brazil (ROLAS-RS/SC), for soil clay content evaluation in Rondônia soils. The study was conducted using 50 soil samples from Rondônia State with wide range clay content. It was tested shaking periods (1.5, 2.0 and 2.5h) associated with periods for soil particles decantation (1.5 and 2.0h) to correlate with the standard method for soil texture testing, known as the pipette method. Clay content determined through this method...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Clay determination; Clay decantation; Shaking period; Soil texture; Soil physics.
Ano: 2011 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-84782011001200010
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Aggregation, carbon, and total soil nitrogen in crop-livestock-forest integration in the Eastern Amazon AGRIAMBI
Silva,Jéssica C. N.; Silva,Arystides R.; Veloso,Carlos A. C.; Dantas,Edilândia F.; Sacramento,José A. A. S. do.
ABSTRACT Sustainable agricultural production systems can improve physical attributes of soil as well as increase carbon and nitrogen stocks in soils. The objective of this study was to evaluate changes in the stability of soil aggregates and contents and stocks of carbon and nitrogen after the conversion of native forest to crop-livestock-forest integration systems in the region of Western Pará. Soil samples from five management systems (including a control) were collected at three depths in a randomized block design, with five replications. The stability of the aggregates, soil density, particle density, and total soil porosity, as well as total carbon and nitrogen and their respective stocks were evaluated. The native forest had the highest percentages...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Organic carbon; Soil physics; Sustainability; Brazilian Amazon.
Ano: 2018 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1415-43662018001200837
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AGRONOMICAL ATTRIBUTES OF SOYBEANS AND SOIL RESISTANCE TO PENETRATION IN NO-TILLAGE AND CHISELED SURFACES REA
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
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Água disponível do solo: algumas características físicas do solo importantes para quantificação. Infoteca-e
PEQUENO, P. L. de L.; LEONIDAS, F. das C.; MENDES, A. M.; VIEIRA, A. H.; MARTINS, E. P.; VASCONCELOS, L. P. de.
O recurso natural solo pode ser definido como um corpo natural, sintetizado em forma de perfil, composto de uma mistura variável de minerais, divididos em pedaços e desintegrados e de matéria orgânica em decomposição, que cobre a terra em uma camada fina e que fornece, quando contém, as quantidades necessárias de ar e de água, amparo mecânico e em parte, subsistência para os vegetais. De uma maneira geral, os solos minerais apresentam quatro componentes principais: substâncias minerais (45%), matéria orgânica (5%), água (25%) e ar (25%). Encontrado-se, sobretudo, num estado realmente adiantado de subdivisão e intimamente misturados. Dentre as propriedades físicas do solo, a textura e a estrutura são de grande importância. A textura diz respeito ao tamanho...
Tipo: Documentos (INFOTECA-E) Palavras-chave: Água; Física do Solo; Umidade do Solo; Soil physics; Soil water.
Ano: 2002 URL: http://www.infoteca.cnptia.embrapa.br/infoteca/handle/doc/703805
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An Alert Regarding a Common Misinterpretation of the Van Genuchten α Parameter Rev. Bras. Ciênc. Solo
van Lier,Quirijn de Jong; Pinheiro,Everton Alves Rodrigues.
ABSTRACT Among the equations available to describe the relation between matric potential and soil water content, the soil water retention function, the most commonly used is the equation proposed by Van Genuchten in his 1980 landmark paper. In soil physics literature, especially in Brazil, several authors relate the inverse of the Van Genuchten parameter α to the air-entry pressure. This study aimed to show this common interpretation to be erroneous, as 1/α corresponds to water contents lower than saturation. The deviation depends on the m parameter. In fact, α is merely a scaling parameter relative to the matric potential axis. Recognizing this mathematical fact may improve the interpretation of soil hydraulic properties based on water retention parameters.
Tipo: Info:eu-repo/semantics/article Palavras-chave: Soil water retention; Soil physics; Empirical equations.
Ano: 2018 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-06832018000100415
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APPLICABILITY OF FINGERPRINTING FOR IDENTIFICATION OF SEDIMENT SOURCES IN A MESOSCALE SEMIARID CATCHMENT REA
Silva,Eveline M. R. da; Medeiros,Pedro; Araújo,José C. de.
ABSTRACT The study aimed at identifying sediment sources in a mesoscale catchment (933 km2) located in the Brazilian semiarid region. The research explored the potential of using a fingerprinting technique to verify the origin of eroded sediments in a catchment by comparing physical and mineralogical properties of potential sediment sources and sediments deposited in a pond (6 × 103 m3 storage capacity) and a reservoir (20 × 106 m3 storage capacity). The goal was to assess the feasibility of using such material to identify sediment sources in a semiarid environment with a high density of surface reservoirs. Chemical variables were studied by mineralogical analysis using scanning electron microscopy (SEM) and multivariate statistics. The results showed that...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Sediment dynamics; Soil physics; Soil mineralogy; Semiarid.
Ano: 2018 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-69162018000400553
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Assessment of pedotransfer functions for estimating soil water retention curves for the amazon region Rev. Bras. Ciênc. Solo
Medeiros,João Carlos; Cooper,Miguel; Dalla Rosa,Jaqueline; Grimaldi,Michel; Coquet,Yves.
Knowledge of the soil water retention curve (SWRC) is essential for understanding and modeling hydraulic processes in the soil. However, direct determination of the SWRC is time consuming and costly. In addition, it requires a large number of samples, due to the high spatial and temporal variability of soil hydraulic properties. An alternative is the use of models, called pedotransfer functions (PTFs), which estimate the SWRC from easy-to-measure properties. The aim of this paper was to test the accuracy of 16 point or parametric PTFs reported in the literature on different soils from the south and southeast of the State of Pará, Brazil. The PTFs tested were proposed by Pidgeon (1972), Lal (1979), Aina & Periaswamy (1985), Arruda et al. (1987),...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Parametric PTFs; Point PTFs; Soil physics; Soil water.
Ano: 2014 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-06832014000300005
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Atributos físicos e estoques de carbono do solo sob diferentes usos da terra em Rondônia, Amazônia Sul-Ocidental PFB - Pesquisa Florestal Brasileira
Mascarenhas, Adriano Reis Prazeres; Volpato Sccoti, Marta Silvana; Melo, Rafael Rodolfo; Corrêa, Fernando Luíz de Oliveira; de Souza, Emanuel Fernando Maia; Andrade, Reginaldo Almeida; Bergamin, Anderson Cristian; Müller, Manfred Willy.
Objetivou-se estudar o comportamento dos atributos físicos e dos teores e estoques de carbono do solo em sistema agroflorestal multiestratificado (SAF), comparativamente a diferentes modalidades de uso solo, sendo elas o cultivo de cacaueiro sob manejo agroecológico (CAC), pastagem cultivada (PAS) e floresta nativa (FLN). A área de estudo localiza-se na estação experimental da CEPLAC em Ouro do Preto do Oeste, RO. Nos quatro tratamentos foram instaladas, ao acaso, cinco parcelas de 20 m x 30 m. Nessas parcelas, foram coletadas amostras de solo indeformadas e deformadas nas profundidades de 0 a 20 cm e 20 a 40 cm, para determinação dos atributos fiscos e estoque de carbono no solo. Os valores de densidade do solo no SAF, CAC e PAS apresentaram-se elevados e...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Recursos Florestais Qualidade Ambiental Agroecossistema; Física do solo; Sustentabilidade Agroecosystems; Soil physics; Sustainability.
Ano: 2017 URL: http://pfb.cnpf.embrapa.br/pfb/index.php/pfb/article/view/1295
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Avaliação de métodos de determinação da densidade de solo em amostras com diferentes atividades da fração argila coletadas no município de Rio Branco, estado do Acre. Infoteca-e
SILVA, L. M. da; COSTA, R. de K. do N.; ALMEIDA, A. S. de; OLIVEIRA, C. H. A. de; ARAÚJO, E. A. de; TAVARES, O. C. H.; PEREIRA, M. G.; SANTOS, O. A. Q. dos.
No Acre, uma das características marcantes dos solos é a presença de minerais de argila do tipo 2:1, que confere padrões diferenciados de consistência em função do conteúdo de água. Esse comportamento implica em dificuldades no processo de amostragem e na avaliação de atributos físicos do solo, com destaque para a densidade do solo (Ds), atributo de grande relevância na avaliação do grau de compactação ou adensamento e componente do cálculo do estoque de nutrientes e carbono orgânico do solo. O objetivo deste estudo foi avaliar os métodos do anel volumétrico e do torrão parafinado na determinação da Ds em solos que apresentam argilas 2:1, em comparação a um solo de natureza caulinítica e oxídica, em horizontes superficiais e subsuperficiais. Não foi...
Tipo: Boletim de Pesquisa e Desenvolvimento (INFOTECA-E) Palavras-chave: Densidade do solo; Método do torrão parafinado; Método do anel volumétrico; Paraffin clod method; Volumetric ring method; Fìsica del suelo; Análisis del suelo; Minerales arcillosos; Densidad del suelo; Acre; Amazônia Ocidental; Western Amazon; Amazonia Occidental; Física do Solo; Análise do Solo; Argila; Soil physics; Soil analysis; Soil density; Clay minerals.
Ano: 2020 URL: http://www.infoteca.cnptia.embrapa.br/infoteca/handle/doc/1126449
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Calibration of a soil moisture sensor with disturbed and undisturbed soil samples from Bahia AGRIAMBI
Lima,João G. A.; Oliveira,Aureo S. de; Souza,Luciano da S.; Silva,Neilon D. da; Viana,Paula C..
ABSTRACT The objective of this study was to evaluate the models proposed by manufacturers and in the literature with respect to soil moisture measurement and to evaluate the performance of the CS616 sensor in the calibration of disturbed and undisturbed soil samples. These calibrations were performed using linear and quadratic models. Disturbed samples were collected in São Gabriel/BA, six samples placed in pots, whereas undisturbed samples were collected in Cruz das Almas/BA, three samples directly collected in the area and placed in a container. A calibration was performed between 21/12/2016 and 08/01/2017. The models proposed in the literature and by manufacturers differed in the estimation of volumetric soil moisture. Disturbed soil samples had higher...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Soil water content; Time domain reflectometry; Soil physics.
Ano: 2018 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1415-43662018001000696
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Can Soil Penetration Resistance and Bulk Density Be Determined in a Single Undisturbed Sample? Rev. Bras. Ciênc. Solo
Fernandes,Carolina; Silva,Roniram Pereira da; Marcelo,Adolfo Valente.
Soil quality indicators such as penetration resistance (PR) and bulk density (BD) are traditionally determined in a single undisturbed soil sample. The aim of this study was to assess the effect of PR measurements of undisturbed samples on the determination of BD in the same sample of two soils differing in clay contents. To this end, samples were collected from the 0.00-0.10 and 0.10-0.20 m layers of two soils of clayey and very clayey texture. Volumetric rings were used to collect a total of 120 undisturbed soil samples from each soil layer that were divided into two subsets containing 60 units each. One sample set, designated “perforated samples”, was used to determine PR and BD in the same undisturbed sample; the other, named “intact samples”, was used...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Soil physics; Latossolo Vermelho; Clayey texture; Very clayey texture.
Ano: 2015 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-06832015000300763
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Caracterização físico-hídrica de latossolo amarelo da região de Capitão Poço, Pará. Infoteca-e
COSTA, M. P. da; TEIXEIRA, L. B..
bitstream/item/42255/1/Boletim-Pesquisa-133-CPATU.pdf
Tipo: Séries anteriores (INFOTECA-E) Palavras-chave: Densidade aparente; Capitao Poco; Pará; Brasil; Oxysol; Organic mather; Analysis.; Análise; Água; Argila; Física; Matéria Orgânica; Latossolo Amarelo; Porosidade; Solo.; Amazonia; Bulk density; Clay; Porosity; Soil physics; Water..
Ano: 1992 URL: http://www.infoteca.cnptia.embrapa.br/infoteca/handle/doc/380484
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Chemical migration during soil water retention curve evaluation Anais da ABC (AABC)
Pires,Luiz F.; Villanueva,Felipe C.A.; Dias,Nivea M.P.; Bacchi,Osny O. Santos; Reichardt,Klaus.
Wetting and drying (W-D) cycles can induce important elemental migrations in soils. The main purpose of this work was to study the possible existence of soil chemical elemental migrations in samples submitted to repeated W-D cycles during evaluations of soil water retention curve (SWRC). The experimental measurements were carried out by Atomic Absorption Spectrometry (AAS) for Ca2+, Mg2+ and K+ on samples of three different Brazilian tropical soils (Geric Ferralsol, Eutric Nitosol and Rhodic Ferralsol). Results demonstrate an increase in the electrical conductivity of the water extracted from the samples and significant losses of Ca2+, Mg2+ and K+ during the applications of up to nine W-D cycles. It was also observed differences in SWRC for all soils when...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Analytical methods; Soil structure; Wetting-drying cycles; Soil physics.
Ano: 2011 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652011000300028
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Compaction caused by mechanized operations in a Red- Yellow Latosol cultivated with coffee over time Ciência e Agrotecnologia
Martins,Paula Cristina Caruana; Dias Junior,Moacir de Souza; Andrade,Maria Luiza de Carvalho; Guimarães,Paulo Tácito Gontijo.
The main source of soil structure degradation in coffee plantation is the machinery traffic because these operations may cause soil compaction affecting the crop development. This study aimed to generate the load-bearing capacity models for a Red-Yellow Latosol and to determine through the use of these models the soil susceptibility to compaction of the coffee plantation due to the implantation time and the compaction caused by the machinery traffic on the traffic lines located at the top and bottom of the ground. This study was carried out in the EPAMIG Experimental Farm, located at Três Pontas, MG, in coffee plantations (Coffee arabica L.) with 2, 7, 18 and 33 years of establishment. To obtain the load-bearing capacity models, 12 undisturbed soil samples...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Precompression stress; Structure degradation; Soil physics.
Ano: 2012 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1413-70542012000400002
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Correlation of soil properties with weed ocurrence in sugarcane areas Planta Daninha
Lousada,L.L.; Freitas,S.P.; Marciano,C.R.; Esteves,B.S.; Muniz,R.A.; Siqueira,D.P..
Soil properties can influence weed community composition and weed density agricultural area. Knowing this relationship would allow to choose the best strategy for the control of such plants. This study aimed to investigate the correlation between weed density and chemical and physical attributes of soil in three areas (UCO, USC, and UPA) for commercial sugarcane cultivation in Campos dos Goytacazes, RJ. Grids of 40 m x 40 m were established in the areas, and soil samples were collected at the intersection points for physical and chemical analysis and evaluation of the soil seed bank (SSB), followed by a phyto-sociological survey of the weeds present. Samples were collected during two periods: February/March and June/July, 2010. SSB presented the greatest...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Soil physics; Soil chemistry; Seed bank; Phyto-sociological survey.
Ano: 2013 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-83582013000400002
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Crop productivity and soil quality after fertilization with liquid swine manure Acta Agron. (Palmira)
Rimoldi Tavanti,Renan Francisco; Freddi,Onã da Silva; Tavanti,Tauan Rimoldi; Lorenzon,Kayane; dos Santos,Igor de Morais; Demicheli,Matheus; Costa,Letícia Carolina; Montanari,Rafael; Breda,Carlos Cesar.
Abstract An unresolved question about the use of animal waste in agriculture is its effect on the physical and chemical attributes of soil, especially in commercial grain producing areas that have adopted direct seeding system (DSS). Aiming at contributing to the clarification of this question, we conducted a study in the mid-north region of the Mato Grosso state, Brazil, in a soybean and maize commercial area consolidated in DSS. Different doses of liquid swine manure (LSM) were applied and compared with NPK mineral fertilization. The aim of this study was to evaluate the physical and chemical quality of the soil and the productive potential of the soybean and maize crops under LSM doses and NPK fertilizer. Results indicated an increase in levels of K, P,...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Glycine max L.; Zea mays L.; Fertilizers; Soil physics; Soil fertility; Direct sowing system.
Ano: 2018 URL: http://www.scielo.org.co/scielo.php?script=sci_arttext&pid=S0120-28122018000200303
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Deep subsoiling of a subsurface-compacted typical hapludult under citrus orchard Rev. Bras. Ciênc. Solo
Medeiros,João Carlos; Figueiredo,Getulio Coutinho; Mafra,Álvaro Luiz; Rosa,Jaqueline Dalla; Yoon,Sung Won.
Soil management practices which increase the root depth penetration of citrus are important to the longevity and yield maintenance of this plant, especially in regions where long periods of drought are common, even in soil conventionally subsoiled to a depth of 30-40 cm, when the orchard was first established. The objective of this study was to evaluate the efficiency of subsoiling on the physical and hydric properties of a Typical Hapludult and fruit yield in a 14-year-old citrus orchard located in Piracicaba, SP. The treatments consisted of: no-subsoiling (with no tilling of the soil after the orchard was planted); subsoiling on one side of the plant lines (SUB. 1); and subsoiling on both sides of the plant lines (SUB. 2). The subsoiling treatments were...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Soil compaction; Soil management; Soil physics; Subsoiler.
Ano: 2013 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-06832013000400008
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Effects of tillage systems on physical properties of a cohesive yellow argisol in the northern state of Espírito Santo, Brazil Rev. Bras. Ciênc. Solo
Zuffo,Valmir José; Pires,Fabio Ribeiro; Bonomo,Robson; Vitória,Edney Leandro da; Celin Filho,Ademar; Santos,Eduardo Oliveira de Jesus.
Tillage systems are a key element of the technology of crop production, both with a view to crop yield and from the perspective of soil conservation and sustainability of the production system. The aim of this paper was to evaluate the effects of five tillage systems on the physical properties of a cohesive Yellow Argisol. The experiment was installed in the field on January 21, 2011 and lasted 260 days, in an area previously used as pasture with Brachiaria grass without liming or fertilization, but irrigated by a low pressure spray system. The treatments, in five replications and in a randomized block design, consisted of: 1) disk plow (twice) + disk harrow + ridge-furrow tillage (raising a ridge along the planting row), 135 days after transplanting (DP +...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Carica papaya; Cohesive soils; Coastal plains; Soil management; Soil physics.
Ano: 2013 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-06832013000500026
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Gamma-ray computed tomography to evaluate changes in the structure of a clayey soil due to agricultural traffic - doi: 10.4025/actasciagron.v33i3.4727 Agronomy
Pires, Luiz Fernando; Universidade Estadual de Ponta Grossa.
A first generation gamma-ray computed tomography (CT) equipped with a 137Cs source was used to investigate changes in soil structure due to agricultural machinery traffic. Core samples with volume of 55 cm3 were collected at the surface (0-10 cm) of a Brazilian clayey soil. Significant alterations in soil structure occurred after two passages of tractor wheels, with important decreases in soil porosity. CT data allowed a continuous analysis of soil bulk density and also soil porosity distribution for 1.25 and 1.20 mm layers, which cannot be provided by traditional methods commonly used in soil physics.
Palavras-chave: 5.01.01.02-1; 3.09.01.00-6 gamma-ray attenuation; Soil bulk density; Soil porosity; Image analysis; Soil physics Física dos Solos gamma-ray attenuation; Soil bulk density; Soil porosity; Image analysis; Soil physics.
Ano: 2011 URL: http://periodicos.uem.br/ojs/index.php/ActaSciAgron/article/view/4727
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