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| Registros recuperados: 161 | |
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| Scherpinski, Clementina; UNIOESTE; Uribe Opazo, Miguel Angel; UNIOESTE; Vilas Boas, Marcio Antonio; UNIOESTE; Sampaio, Silvio César; UNIOESTE; Johann, Jerry Adriani; UNIOESTE. |
| Quando as áreas cultivadas são utilizadas com intensa produção agrícola, o solo apresenta alterações espaciais e temporais em seus atributos físico-hídricos de modo que a viabilidade econômica da produção agrícola depende desses atributos, requerendo, consequentemente, estudos detalhados sobre a variabilidade espacial do solo. Desse modo, o objetivo do trabalho foi avaliar a variabilidade espacial da condutividade hidráulica saturada e da infiltração da água no solo, em uma área de 20 ha, caracterizada pela intensa produção de grãos, foi usado uma grade de 50 x 50 m, utilizando o permeâmetro de Guelph. Nas análises da variabilidade espacial, utilizaram-se os métodos geoestatísticos. Concluiu-se que os atributos físico-hídricos estudados apresentaram... |
| Tipo: Foram seguidos os métodos da Embrapa |
Palavras-chave: 5.01.00.00-9 Agronomia permeâmetro de Guelph; Geoestatística; Autocorrelação espacial Ciências do Solo; Física do Solo Guelph permeameter; Geostatistics; Spatial autocorrelation. |
| Ano: 2010 |
URL: http://periodicos.uem.br/ojs/index.php/ActaSciAgron/article/view/959 |
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| Coelho, Edy Célia; UNIOESTE; Souza, Eduardo Godoy de; UNIOESTE; Uribe-Opazo, Miguel Angel; UNIOESTE; Pinheiro Neto, Raimundo; UEM. |
| O objetivo deste trabalho foi avaliar a influência da densidade amostral (três grades) e do tipo de interpolador (krigagem, inverso da distância, inverso da distância ao quadrado e polinomial) na elaboração de mapas temáticos da produtividade da soja em uma área de LATOSSOLO VERMELHO Distroférrico, no período de 1998 a 2002, conduzida em sistema de agricultura de precisão. As grades selecionadas possuíam 128, 64 e 32 parcelas utilizando amostragem alinhada sistemática estratificada (AASE). A partir de cada grade amostral e utilizando cada um dos interpoladores, foram gerados os mapas temáticos. O coeficiente de desvio relativo (CDR) foi proposto visando expressar a diferença média em módulo dos valores interpolados em cada grade em relação à grade... |
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Palavras-chave: 5.02.01.07-7 Solos Florestais agricultura de precisão; Geoestatística; Amostragem. precision agriculture; Geostatistics; Sampling. |
| Ano: 2009 |
URL: http://periodicos.uem.br/ojs/index.php/ActaSciAgron/article/view/6645 |
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| Fonseca, Leticia d’Agosto Miguel; Lani, Joao Luiz; Fernandes Filho, Elpídio Inácio; Santos, Gerson Rodrigues dos; Ferreira, Williams Pinto Marques; Santos, Adriana Maria Rocha Trancoso. |
| The present study aimed to evaluate the relationship between the physical properties of the soil and relief in areas that are susceptible to landslides in the sub-basin of the Córrego do Yung, a creek in the urban district Três Moinhos of Juiz de Fora, Minas Gerais. Depth measurements of the solum were made at the soil sampling points, and the subsurface material was collected and analyzed for the two factors of particle size and type of horizon. In the laboratory, we determined the hydraulic conductivity, bulk and particle density, and total porosity, macroporosity and microporosity. The values of the physical properties throughout the sub-basin were predicted and mapped. Thematic maps were generated and showed a relation to each other: the clay was... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: 1.07.05.03-1 physical soil; Geostatistics; Landslide física do solo. |
| Ano: 2017 |
URL: http://periodicos.uem.br/ojs/index.php/ActaSciAgron/article/view/30561 |
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| Genú, Aline Marques; Universidade Estadual do Centro-Oeste; Roberts, Dar; University of California; Demattê, José Alexandre Melo; Universidade de São Paulo. |
| Systematic, physically based acquisition of information regarding soils is required to meet increasing demand in agricultural and environmental systems. The objective of this work is to evaluate the use of multiple endmember spectral mixture analysis (MESMA) for mapping soil attributes within ASTER imagery. A total of 184 georeferenced soil samples were collected from Rafard, São Paulo State, Brazil. These points were overlain on the satellite image to collect spectral data. The laboratory and image information were then arranged and prepared by clustering samples into classes based on the following soil attributes: texture, organic matter, base saturation (V%), CEC and total iron. Following this classification, mean spectral curves were generated for... |
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Palavras-chave: Agronomia; Ciência do Solo remote sensing; Spatial distribution; Geostatistics. |
| Ano: 2013 |
URL: http://periodicos.uem.br/ojs/index.php/ActaSciAgron/article/view/16119 |
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| Kazama, Elizabeth Haruna; Silva, Rouverson Pereira da; Carneiro, Franciele Morlin; Teixeira, Daniel de Bortoli; Vale, Welington Gonzaga do; Pereira, Gener Tadeu. |
| Pearson's correlation and spatial variability are tools that can be used to help one understand the process of losses in the mechanical harvesting of cotton. Therefore, the objective of this study was to model the spatial distribution and map the losses of mechanical cotton harvest using geostatistics and to correlate the losses with agronomic variables using Pearson’s correlation. The experiment was conducted in Itiquira and Lucas do Rio Verde, Mato Grosso State, Brazil. At each sampling point, the evaluated variables were agronomic plant variables and cotton losses in the soil and the plant (divided into lower, medium and upper thirds) and the sum total of losses. The highest losses in cotton harvest occurred in the lower third and on the soil, both of... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Gossypium hirsutum; Geostatistics; Precision agriculture. Mecanização agrícola Agricultura de precisão Gossypium hirsutum; Geostatistics; Precision agriculture.. |
| Ano: 2020 |
URL: http://periodicos.uem.br/ojs/index.php/ActaSciAgron/article/view/42587 |
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| Souza, Gustavo Soares; UFES; Lima, Julião Soares de Souza; UFES; Silva, Samuel de Assis; UFES; Oliveira, Rone Batista de; UNESP. |
| Estudos mostram a importância de se conhecer a variabilidade dos atributos do solo para o manejo mais eficiente. O objetivo deste trabalho foi analisar a variabilidade espacial dos atributos químicos de um Argissolo Vermelho-Amarelo, cultivado com pastagem de Brachiaria decumbens, em Alegre – Espírito Santo. Amostras de solo foram coletadas na profundidade de 0-0,2 m, nos pontos de cruzamento de uma malha com intervalos regulares de 10 m, perfazendo o total de 64 pontos. Os dados foram submetidos à analise estatística descritiva, geoestatística e interpolação por krigagem ordinária. Os valores dos coeficientes de variação apresentaram-se baixos para pH, altos para Al e m% e médios para os demais atributos. Os atributos pH, P, H+Al e m% apresentaram forte... |
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Palavras-chave: 5.01.00.00-9 Agronomia dependência espacial; Geoestatística krigagem. spatial dependence; Geostatistics; Kriging. |
| Ano: 2008 |
URL: http://periodicos.uem.br/ojs/index.php/ActaSciAgron/article/view/5322 |
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| CARVALHO,LAÉRCIO A. DE; MEURER,ISMAEL; JUNIOR,CARLOS A. DA SILVA; SANTOS,CRISTIANE F.B.; LIBARDI,PAULO L.. |
| When deposited on land the vinasse can promote improvement in fertility, however, often fertilizer application occurs in areas considered homogeneous, without taking into account the variability of the soil. The objective of this study was to evaluate the effect of vinasse application on potassium content in two classes of soils cultivated with sugarcane, and characterize the spatial variability of soil using geostatistical techniques. In the 2010 and 2011 crop year, soil samples were collected from an experimental grid at 0-0.2 and 0.2-0.4 m depth in three soils cultivated with sugarcane, totaling 90 samplings in each grid, for the determination of pH, calcium (Ca), magnesium (Mg), potassium (K), phosphorus (P), aluminum (Al) and potential acidity (H +... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Geostatistics; Saccharum officinarum; Semivariogram; Soil fertility. |
| Ano: 2014 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652014000401999 |
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| SILVEIRA,EDUARDA M.O.; REIS,ALINY A. DOS; TERRA,MARCELA C.N.S.; WITHEY,KIERAN D.; MELLO,JOSÉ M. DE; ACERBI-JÚNIOR,FAUSTO W.; FERRAZ FILHO,ANTONIO CARLOS; MELLO,CARLOS R.. |
| Abstract: Here we model and describe the wood volume of Cerrado Sensu Stricto, a highly heterogeneous vegetation type in the Savanna biome, in the state of Minas Gerais, Brazil, integrating forest inventory data with spatial-environmental variables, multivariate regression, and regression kriging. Our study contributes to a better understanding of the factors that affect the spatial distribution of the wood volume of this vegetation type as well as allowing better representation of the spatial heterogeneity of this biome. Wood volume estimates were obtained through regression models using different environmental variables as independent variables. Using the best fitted model, spatial analysis of the residuals was carried out by selecting a semivariogram... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Cerrado sensu stricto; Forest inventory; Geostatistics; Regression kriging; Volumetry. |
| Ano: 2019 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652019000700853 |
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| Pinheiro,Marcelo H.O.; Azevedo,Thiago S. de; Monteiro,Reinaldo. |
| The analysis of the influence of edaphic finer textures, as a facilitating factor for the expansion of forest formations in the absence of fire, was possible thanks to rare characteristics found in a savanna fragment located in the State of São Paulo, Brazil. The total suppression of fire for over four decades, and the occurrence of two savanna physiognomies, cerrado sensu stricto and cerradão, allowed the conduction of this study based on the hypothesis that cerradão, a physiognomy of forest aspect consisting of fire-sensitive tree and shrubs species, is favored by fire absence and higher soil hydric retention capacity. Edaphic samples were collected from a regular grid of 200 m² for the production of isopletic maps of the distribution of clay, fine sand,... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Cerrado; Fire suppression; Geostatistics; Savanna dynamics. |
| Ano: 2010 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652010000200014 |
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| Grego,Célia Regina; Vieira,Sidney Rosa; Xavier,Mauro Alexandre. |
| Tests to evaluate competition between plants, in general do not consider the soil spatial variability, nevertheless, the uniformity rarely is present and can not be assumed without verification. The aim of this work was to apply geostatistics to verify the spatial variability of the soil in an experimental field near Ribeirão Preto, SP, with sugarcane variety IACSP93-3046. Ninety seven geo-referenced samples, placed at distances of 10 m, were collected for soil chemical analysis, soil resistance to penetration and biometric evaluation of the sugar cane plant included number of tillers, stalk diameter, stalk height, estimated productivity (TSSe) and root density. Geostatistics has been applied by means of semivariogram, data interpolation via kriging and... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Geostatistics; Soil chemistry; Soil resistance to penetration; Root; Tillers. |
| Ano: 2010 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0006-87052010000500012 |
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| Gonçalves,Antonio Carlos Andrade; Trintinalha,Marcos Antonio; Folegatti,Marcos Vinicius; Rezende,Roberto; Tormena,Cássio Antonio. |
| Irrigated agricultural fields usually show variable crop water demand. If water application is done to match this spatially variable demand, the water use efficiency can be substantially improved. Soil water management by irrigation has been one of the most important factors to increase crop yield. To look for the economic viability of the process, the use of several inputs, particularly water, should be done with high efficiency levels. Historically, irrigation uniformity has been evaluated above the soil surface, in which applied water was the only factor to be taken into account. However, the crop will respond to soil water content uniformity, which can differ from the uniformity of water application. To evaluate temporal stability of spatial pattern of... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Irrigation; Geostatistics; Soil water uniformity; TDR. |
| Ano: 2010 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0006-87052010000500016 |
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| Machado,Roriz Luciano; Ceddia,Marcos Bacis; Carvalho,Daniel Fonseca de; Cruz,Eleandro Silva da; Francelino,Marcio Rocha. |
| Knowledge of maximum daily rain and its return period in a region is an important tool to soil conservation, hydraulic engineering and preservation of road projects. The objective of this work was to evaluate the spatial variability of maximum annual daily rain considering different return periods, at the Rio de Janeiro State. The data set was composed by historical series of 119 rain gauges, for 36 years of observation. The return periods, estimated by Gumbel distribution, were 2, 5, 10, 25, 50 and 100 years. The spatial variability of the return periods was evaluated by semivariograms. All the return periods presented spatial dependence, with exponential and spherical model fitted to the experimental semivariograms. The parameters of the fitted... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Runoff; Extreme rainfall; Geostatistics; Kriging. |
| Ano: 2010 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0006-87052010000500009 |
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| Siqueira,Glécio Machado; Dafonte,Jorge Dafonte; González,Antonio Paz; Vázquez,Eva Vidal; Armesto,Monteserrat Valcarcel; Guedes Filho,Osvaldo. |
| ABSTRACT Soil sampling is an important stage of digital soil mapping. The objective of this study was to characterize the spatial design of soil sampling using soil apparent electrical conductivity (ECa) and its optimized spatial sampling. For the characterization, it was used the Spatial Simulated Annealing (SSA) technique, incorporated on the software SANOS 0.1, and the method of response surface sampling design on the software ESAP 2.35. The ECa was measured at 1,887 points in an area of 6 ha located in the northwestern region of Spain. The EM38-DD equipment (Geonics Limited 2005) was used at 2 depths: vertical dipole (1.5 m effective measurement depth) and horizontal dipole (0.75 m effective measurement depth). Semivariogram showed trend for ECa in... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Geostatistics; Semivariogram; Spatial variability; Optimization; Soil sampling. |
| Ano: 2016 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0006-87052016000400459 |
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| Registros recuperados: 161 | |
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