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| Registros recuperados: 159 | |
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| Yanagi Junior,Tadayuki; Schiassi,Leonardo; Rossoni,Diogo F.; Ponciano,Patrícia F.; Lima,Renato R. de. |
| The knowledge of the spatial variability of noise levels and the build of kriging maps can help the evaluation of the salubrity of environments occupied by agricultural workers. Therefore, the objective of this research was to characterize the spatial variability of the noise level generated by four agricultural machines, using geostatistics, and to verify if the values are within the limits of human comfort. The evaluated machines were: harvester, chainsaw, brushcutter and tractor. The data were collected at the height of the operator's ear and at different distances. Through the results, it was possible to verify that the use of geostatistics, by kriging technique, made it possible to define areas with different levels for the data collected. With... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Human environment; Acoustic comfort; Occupation health; Geostatistics. |
| Ano: 2012 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-69162012000200002 |
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| Oliveira,Job T. de; Roque,Cassiano G.; Teodoro,Paulo; Montanari,Rafael. |
| ABSTRACT The common bean is widely cultivated in Brazil. In the 2016–2017 growing season, an experiment was carried out in a Typic Quartzipsamment (or Neossolo Quartzarênico) soil in the municipality of Cassilândia, MS, Brazil, with the aim of characterizing specific aspects of soil management, using a linear and spatial correlation between the irrigated yield of common beans and the chemical properties of the soil. Soil samples were collected from layers at depths 0.00–0.10 and 0.10–0.20 m, within a grid of 117 georeferenced points. A data analysis was carried out using statistical and geostatistical techniques. A multiple regression analysis showed that about 31% of the grain yield variability of the irrigated common bean crop could be attributed to the... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Precision agriculture; Geostatistics; Soil management; Irrigation; (Phaseolus vulgaris L.). |
| Ano: 2020 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-69162020000500645 |
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| Rodrigues,Marcos S.; Corá,José E.; Fernandes,Carolina. |
| Taking into account that the sampling intensity of soil attributes is a determining factor for applying of concepts of precision agriculture, this study aims to determine the spatial distribution pattern of soil attributes and corn yield at four soil sampling intensities and verify how sampling intensity affects cause-effect relationship between soil attributes and corn yield. A 100-referenced point sample grid was imposed on the experimental site. Thus, each sampling cell encompassed an area of 45 m² and was composed of five 10-m long crop rows, where referenced points were considered the center of the cell. Samples were taken from at 0 to 0.1 m and 0.1 to 0.2 m depths. Soil chemical attributes and clay content were evaluated. Sampling intensities were... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Geostatistics; Precision agriculture; Zea mays. |
| Ano: 2012 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-69162012000500005 |
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| BASSOI, L. H.; MIELE, A.; REISSER JUNIOR, C.; GEBLER, L.; FLORES, C. A.; FILIPPINI ALBA, J. M.; GREGO, C. R.; TERRA, V. S. S.; TIMM, L. C.; NASCIMENTO, P. dos S.. |
| Os sistemas de produção atualmente existentes na fruticultura brasileira caracterizam-se pela execução de diversas práticas agrícolas durante o ciclo da cultura, tendo como preocupação a quantidade e a qualidade da produção, e a rentabilidade da atividade agrícola. Nesse contexto, cria-se uma oportunidade para a aplicação de agricultura de precisão, como forma de auxiliar a gestão do sistema de produção e a tomada de decisão pelo produtor. Nesse capítulo, são apresentados quatro estudos de caso em que a realização de procedimentos e o uso de ferramentas, característicos de agricultura de precisão, permitem aos produtores e técnicos a compreensão da variabilidade de atributos do solo e da planta e de suas relações, bem como o estabelecimento de zonas... |
| Tipo: Capítulo em livro técnico (INFOTECA-E) |
Palavras-chave: Geoestatística; Análise multivariada; Agricultura de precisao; Fruticultura; Viticultura; Estatística agrícola; Método estatístico; Maçã; Pêssego; Uva; Precision agriculture; Fruit growing; Viticulture; Geostatistics; Agricultural statistics; Multivariate analysis. |
| Ano: 2014 |
URL: http://www.infoteca.cnptia.embrapa.br/infoteca/handle/doc/1008274 |
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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: Capítulo em livro técnico (INFOTECA-E) |
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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| GREGO, C. R.; PAIM, F. A. de P.; RODRIGUES, C. A. G.; CRISCUOLO, C.; GARCON, E. A. M.; MANJOLIN, R. C.; ALVAREZ, I. A.; ALBUQUERQUE, T. C. S. de. |
| Este trabalho tem como objetivo o uso da análise geoestatística no mapeamento da fertilidade do solo de seis propriedades familiares do Circuito das Frutas, localizadas nos municípios de Itatiba, Atibaia, Jundiaí, Valinhos, Indaiatuba, Jarinú, no estado de São Paulo. |
| Tipo: Boletim de Pesquisa e Desenvolvimento (INFOTECA-E) |
Palavras-chave: Geoestatística; Variabilidade espacial; Krigagem ordinária; Culturas frutíferas; Spatial variability; Ordinary kriging; Fruticultura; Fertilidade do Solo; Geostatistics; Fruit crops. |
| Ano: 2018 |
URL: http://www.infoteca.cnptia.embrapa.br/infoteca/handle/doc/1102129 |
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| Doray, Mathieu; Petitgas, Pierre; Nelson, Laetitia; Mahevas, Stephanie; Josse, E; Reynal, Lionel. |
| Fish-aggregating devices (FADs) are increasingly used worldwide to enhance tuna catches. Meanwhile, ecosystem-based management of this fishery is constrained by a paucity of information regarding the interaction of FAD-associated tuna aggregations with their local environment. This paper reports the results of a nine-month study around a FAD moored near Martinique Island, aimed at assessing the effects of the local environment on the variability of monthly estimates of proximate tuna biomass. Dual-frequency, active acoustics provided highresolution quantitative data on the pelagic community around the FAD, from fish to micronekton forage. Geostatistics were used to compute biomass estimates of the tuna aggregation comprising most of the FADassociated fish... |
| Tipo: Text |
Palavras-chave: Lesser Antilles; Tuna; Environment; Geostatistics; Biomass estimation; Fish aggregating device. |
| Ano: 2009 |
URL: http://archimer.ifremer.fr/doc/2008/publication-6162.pdf |
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| Doray, Mathieu; Petitgas, Pierre; Josse, E. |
| Universal kriging was used to model the spatio-temporal variability in the acoustic density of tuna aggregations recorded during star echosounding surveys around moored fish aggregating devices (FADs) in Martinique (Lesser Antilles). The large-scale deterministic drift in the tuna spatial distribution was modeled using an advection-diffusion equation applied to animal grouping. Residuals from the drift were modeled as a random component with small-scale spatial correlation. An estimation variance formula was derived from this deterministic-statistical mixed model to assess the mean precision of density estimates of daytime tuna aggregation. The mean relative error obtained with our star design for daytime surveys was 24%. The methodology was applied to... |
| Tipo: Text |
Palavras-chave: Acoustic survey precision; Advection diffusion model; Moored fish aggregating devices; Tuna; Geostatistics. |
| Ano: 2008 |
URL: http://archimer.ifremer.fr/doc/2008/publication-4559.pdf |
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| Doray, Mathieu; Mahevas, Stephanie; Trenkel, Verena. |
| Few analyses have been performed to estimate the efficiency of trawls targeting demersal fish using the ratio of catches and acoustic densities. In summer 2006, acoustic and fishing data were collected simultaneously over 3 d by three fishing vessels equipped with identical pelagic trawls in the Bay of Biscay. Variography identified moderate spatial autocorrelation in the acoustic backscatter at a mean scale of 3 km, a scale slightly smaller than the mean haul length (3.5 km), indicating that fish horizontal availability did not influence trawl efficiency. Acoustic backscattering densities expressed as nautical area scattering coefficients (NASCs) recorded in the trawled layer were compared with equivalent NASC (ENASC) values calculated from the species... |
| Tipo: Text |
Palavras-chave: Availability; Bay of Biscay; Catchability; Generalized linear model; Geostatistics; Hake; Vulnerability. |
| Ano: 2010 |
URL: http://archimer.ifremer.fr/doc/00002/11372/7980.pdf |
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| Guarini, Jean-marc; Blanchard, Gerard; Bacher, Cedric; Gros, Philippe; Riera, Pascal; Richard, Pierre; Gouleau, Dominique; Galois, Robert; Prou, Jean; Sauriau, Pierre-guy. |
| Microphytobenthos plays an important role as primary producer in shallow embayments subject to a tidal regime. The present paper aims to characterize the spatial patterns of sedimentary chlorophyll a (chl a) biomass in 2 seasons in the wide intertidal mudflats of the Marennes-Oleron Bay (France); furthermore, it provides estimates of total microphytobenthic biomass. Accordingly, a systematic sampling scheme was performed in June 1995 and in January 1996. On average, biomass was higher in June (ca 120 mg chl a m-2) than in January (ca 85 mg chl a m-2). Moreover, the geostatistical analysis revealed that spatial similarities were propagated over larger distances in June (6 km) than in January (2.2 km). In order to account for this result , we suggest that... |
| Tipo: Text |
Palavras-chave: Marennes Oleron; Intertidal mudflat; Geostatistics; Spatial distribution; Chrlorophyll a; Microphytobenthos. |
| Ano: 1998 |
URL: https://archimer.ifremer.fr/doc/1998/publication-3820.pdf |
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| Woillez, Mathieu; Rivoirard, Jacques; Fernandes, Paul G.. |
| Geostatistical simulations, which can reproduce the spatial variability of a variable, are particularly helpful in estimating the uncertainty associated with the combination of different sources of variability. Acoustic surveys offer an example of such complex situations, where different data (e.g. acoustic backscatter, fish length, and fish age) must be combined to estimate abundance and its associated uncertainty. In this paper, the uncertainty of Scottish herring acoustic-survey estimates is investigated using these techniques. A specific multivariate, geostatistical model is used to describe the structural relationships, which includes highly skewed distributions of the acoustic-backscatter data and incorporates relationships between depth, mean... |
| Tipo: Text |
Palavras-chave: Scottish herring; Geostatistics; Conditional simulations; Acoustic survey. |
| Ano: 2009 |
URL: http://archimer.ifremer.fr/doc/2009/publication-6760.pdf |
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| Registros recuperados: 159 | |
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