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Registros recuperados: 26 | |
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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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NASCIMENTO, P. S.; SILVA, J. A.; COSTA, B. R. S.; BASSOI, L. H.. |
A otimização na aplicação dos recursos hídricos constitui uma das preocupações da agricultura irrigada. Nesse sentido, esta pesquisa foi desenvolvida com o objetivo de aplicar o conceito de zonas homogêneas do solo para a realização do manejo diferenciado da irrigação em um pomar de videira. O experimento foi conduzido em área de produção comercial, localizada no Perímetro Irrigado Senador Nilo Coelho, em Petrolina-PE. Foi selecionada uma área com 40 fileiras de plantas e 82 plantas por fileira, em um pomar de videira cultivar Thompson Seedless sobre o porta-enxerto SO4, com 1 difusor por planta e conduzida no sistema de latada. Amostras de solo foram coletadas nas profundidades de 0,0-0,2 e 0,2-0,4 m para a determinação da curva de retenção de água no... |
Tipo: Parte de livro |
Palavras-chave: Vale do São Francisco; Available soil water; Spatial dependence; Uva; Irrigação; Manejo; Vitis Vinifera; Grapes; Geostatistics. |
Ano: 2014 |
URL: http://www.infoteca.cnptia.embrapa.br/infoteca/handle/doc/1008326 |
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Cotteleer, Geerte; Stobbe, Tracy; van Kooten, G. Cornelis. |
Due to economic and population growth farmland and to a lesser extend other undeveloped areas are under pressure in the urban-rural fringe in British Columbia, Canada. The objectives of this paper are to determine if residential property values near Victoria, BC include open-space premiums for farmland, parks or golf courses, and to determine if using assessed values instead of market prices of the property result in the same findings. We estimate a Seemingly Unrelated Regression (SUR) model with two hedonic pricing equations, one with actual market values as the dependent variable and one with assessed property values, and compare the resulting estimates of shadow prices for open space amenities. Furthermore, we take account of spatial autocorrelation and... |
Tipo: Working or Discussion Paper |
Palavras-chave: Hedonic pricing models; Spatial dependence; Assessed property values; Open space; Community/Rural/Urban Development; Land Economics/Use; R14; R52; C21; Q20; H23. |
Ano: 2008 |
URL: http://purl.umn.edu/37085 |
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Nivievskyi, Oleg. |
Even after more than 15 years of transition from plan to market, agriculture in Ukraine still faces many challenges in terms of its structure. In particular, both the recently approved WTO accession, and the ongoing negotiations on a free trade agreement with the EU will require improvements in productivity and competitiveness at the farm level. The evidence in the literature based on either data envelopment (DEA) or stochastic frontier analysis (SFA) in Ukraine points to significant heterogeneity of technical efficiency and TFP scores. However, the drivers underlying these patterns have not been explicitly studied yet. Using farm-level data for 2004-2005, this paper investigates the determinants of productivity growth in Ukrainian dairy farming. The... |
Tipo: Conference Paper or Presentation |
Palavras-chave: Ukraine; Dairy farming; TFP; Spatial dependence; Production Economics; Productivity Analysis. |
Ano: 2009 |
URL: http://purl.umn.edu/51403 |
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Batistella Pasini,Mauricio Paulo; Dal'Col Lúcio,Alessandro; Cargnelutti,Alberto Filho. |
The objective of this work was to select semivariogram models to estimate the population density of fig fly (Zaprionus indianus; Diptera: Drosophilidae) throughout the year, using ordinary kriging. Nineteen monitoring sites were demarcated in an area of 8,200 m2, cropped with six fruit tree species: persimmon, citrus, fig, guava, apple, and peach. During a 24 month period, 106 weekly evaluations were done in these sites. The average number of adult fig flies captured weekly per trap, during each month, was subjected to the circular, spherical, pentaspherical, exponential, Gaussian, rational quadratic, hole effect, K-Bessel, J-Bessel, and stable semivariogram models, using ordinary kriging interpolation. The models with the best fit were selected by... |
Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Zaprionus indianus; Geostatistics; Integrated pest management; Monitoring; Regionalized variables; Spatial dependence. |
Ano: 2014 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-204X2014000700493 |
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Silva,Kátia Araújo da; Rodrigues,Marcos Sales; Moreira,Filipe Bernard Ramos; Lira,Aíris Layanne Ferreira; Lima,Augusto Miguel Nascimento; Cavalcante,Ítalo Herbert Lucena. |
Abstract Soil sampling is a fundamental procedure in the decision making regarding the management of the soil, thus, a sampling plan should represent as accurately as possible the evaluated crop field. Therefore, the objectives of this study were to suggest a soil sampling approach and soil sampling point allocation using spatial analyses and compare to the classic statistic method in irrigated mango orchards in the Brazilian semi-arid region. The experiment was carried out in three commercial mango orchards located in the region of the São Francisco Valley, Brazil. Soil samples were collected in 0-0.2 m and 0.2-0.4 m depths following regular grids where the number of samples varied from 50 to 56. Soil texture, soil bulk density, soil total porosity,... |
Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Geostatistics; Mangifera indica L; Semivariogram; Spatial dependence. |
Ano: 2020 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-29452020000503003 |
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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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Registros recuperados: 26 | |
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