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A Classification for a Geostatistical Index of Spatial Dependence Rev. Bras. Ciênc. Solo
Seidel,Enio Júnior; Oliveira,Marcelo Silva de.
ABSTRACT: In geostatistical studies, spatial dependence can generally be described by means of the semivariogram or, in complementary form, with a single index followed by its categorization to classify the degree of such dependence. The objective of this study was to construct a categorization for the spatial dependence index (SDI) proposed by Seidel and Oliveira (2014) in order to classify spatial variability in terms of weak, moderate, and strong dependence. Theoretical values were constructed from different degrees of spatial dependence, which served as a basis for calculation of the SDI. In view of the form of distribution and SDI descriptive measures, we developed a categorization for posterior classification of spatial dependence, specific to each...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Geostatistics; Spatial dependence; Spatial variability; Semivariogram; Summary measures.
Ano: 2016 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-06832016000100313
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Classification of the coefficient of variation to variables in beef cattle experiments Ciência Rural
Vaz,Marcos André Braz; Pacheco,Paulo Santana; Seidel,Enio Júnior; Ansuj,Angela Pellegrin.
ABSTRACT: This research was conducted to propose a classification of the coefficient of variation (CV%) in many categories of variables of production and carcass of beef cattle experiments. The data was collected from theses and dissertations. We used the methods of classification considering mean and standard deviation, and considering median and pseudo-sigma. The two methods showed similar results so both can be used to classify CV%. We propose only three categories to rank CV%: low, medium and high.
Tipo: Info:eu-repo/semantics/article Palavras-chave: Animal science; Animal experimentation; Variability.
Ano: 2017 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-84782017001100651
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Geostatistics applied to the study of the spatial distribution of Tibraca limbativentris in flooded rice fields Ciência Rural
Pazini,Juliano de Bastos; Botta,Robson Antonio; Seidel,Enio Júnior; Silva,Fernando Felisberto da; Martins,José Francisco da Silva; Barrigossi,José Alexandre Freitas; Rübenich,Rodrigo.
Tibraca limbativentris (rice stem bug) is an insect highly injurious to the rice crop in Brazil. The aim of this research was to define the spatial distribution of the T. limbativentris and improve the sampling process by means of geostatistical application techniques and construction of prediction maps in a flooded rice field located in the "Planalto da Campanha" Region, Rio Grande do Sul (RS), Brazil. The experiments were conducted in rice crop in the municipality of Itaqui - RS, in the crop years of 2009/10, 2010/11 and 2011/12, counting fortnightly the number of nymphs and adults in a georeferenced grid with points spaced at 50m in the first year and in 10m in the another years. It was performed a geostatistical analysis by means adjusting...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Oryza sativa; Rice stem bug; Dispersion; Monitoring.
Ano: 2015 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-84782015000601006
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Mapping of spatiotemporal distribution of Tibraca limbativentris Stal (Hem.: Pentatomidae) in flooded rice crop in Southern Brazil Rev. Bras. entomol.
Costa,Helen da Silva; Seidel,Enio Júnior; Pazini,Juliano de Bastos; Silva,Augusto Maciel da; Silva,Fernando Felisberto da; Martins,José Francisco da Silva; Barrigossi,José Alexandre Freitas.
ABSTRACT The rice stem bug, Tibraca limbativentris Stal (Hem.: Pentatomidae), is one of the main insect pests in Brazilian rice crops. Knowledge of its spatiotemporal distribution can support the development of an effective sampling system and improve IPM strategies. This study aimed to map the spatiotemporal distribution of rice stem bug in flooded rice crop in Southern Brazil. Flooded rice crop was scouted for two seasons to estimate insect densities. Four occurrence categories were observed: no insect, only adults, only nymphs, and both phases. The relationship between phenological stages and insect categories was established. Interpolation (mapping) of occurrence categories of T. limbativentris was performed by multiquadric equations. In two seasons...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Insect ecology; Multiquadric equations; Oryza sativa L.; Pest monitoring; Rice stem bug.
Ano: 2019 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0085-56262019000300205
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Novo índice geoestatístico para a mensuração da dependência espacial Rev. Bras. Ciênc. Solo
Seidel,Enio Júnior; Oliveira,Marcelo Silva de.
O semivariograma possibilita uma avaliação visual da dependência espacial, mas sem resultar diretamente em um valor numérico único que expresse a mensuração de tal dependência. Contudo, a partir dos parâmetros estimados do modelo teórico ajustado ao semivariograma experimental, é possível construir uma medida dessa dependência espacial. Atualmente, há dois índices na literatura, com uso cada vez mais frequente; porém, há inadequações nesses índices existentes. O objetivo deste trabalho foi propor um novo índice para medir a dependência espacial de dados geoestatísticos, que supere as incipiências dos atuais. Esse novo índice utiliza a relação existente entre o semivariograma e o correlograma, contemplando dessa forma todos os aspectos da dependência...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Semivariograma; Alcance prático; Fator de modelo; Medidas resumo.
Ano: 2014 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-06832014000300002
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Relationship between the occurrence of the rice water weevil and water depth in flooded rice crop PAB
Büttow,Germano Tessmer; Pazini,Juliano de Bastos; Seidel,Enio Júnior; Silva,Fernando Felisberto da; Grützmacher,Anderson Dionei; Martins,José Francisco da Silva.
Abstract: The objective of this work was to assess the relationship between the depth of irrigation water and larval infestation by Oryzophagus oryzae in flooded rice crop. Water depth and larval infestation were evaluated in the upper levee, in between levees, and in the lower levee. The data were subjected to the descriptive statistical and geostatistical analyses. The highest larval infestation occurs in field areas with greater water depth, which is typical of the lower levee. The spatial distribution of O. oryzae larvae is of the aggregate type and depends on the greater irrigation water depth.
Tipo: Info:eu-repo/semantics/article Palavras-chave: Oryza sativa; Oryzophagus oryzae; Geostatistics; Spatial distribution..
Ano: 2017 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-204X2017000700557
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Some aspects about the spatial dependence index for variability of soil attributes Ciência Rural
Santos,Eduardo Lucas Ensslin dos; Seidel,Enio Júnior; Pazini,Juliano de Bastos; Oliveira,Marcelo Silva de; Appel Neto,Edemar; Barbosa,Ismael Canabarro.
ABSTRACT: The main purpose of this article was to evaluate the behavior and relationship of the range and components of SDI (Spatial Dependence Index) in general and in function of field factors such as soil types, type of attribute and soil layers. This evaluation was based on real data collected in national journals. It was noticed that the parameter range, in general and for different field factors, presented asymmetric positive behavior. The components of the SDI showed approximately symmetrical behavior. The SDI can capture the range behavior more intensely (the spatial variability behavior in the horizontal direction of the semivariogram), and, in a less intense way, the behavior of the contribution and sill parameters (the spatial dependence...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Spatial dependence; Geostatistics; Semivariogram; Field factors.
Ano: 2018 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-84782018000600252
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