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| Registros recuperados: 19 | |
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| CARVALHO JUNIOR, W. de; LAGACHERIE, P.; CHAGAS, C. da S.; CALDERANO FILHO, B.; BHERING, S. B.. |
| The purpose of this study was to analyze the relationships between soil attributes and environmental covariates in a tropical hillslope environment on a regional scale to estimate spatial distribution of soil attributes and identify statistical and geostatistical techniques that could represent the variation of the soil attributes. The studywas performed in Bom Jardim County, Brazil, and covered an area of 390 km2 with a soil database of 208 sample points distributed in six depth layers (0.53 pts/km2). The study used 18 environmental covariates derived from DEM and satellite imagery. The models evaluated were linear regression, regression trees and ordinary and regression kriging. An exploratory analysis showed that DEM, NDVI, MRVBF, MSP, b3/b2, b5/b7,... |
| Tipo: Artigo em periódico indexado (ALICE) |
Palavras-chave: GlobalSoilMap.Net; Kriging; Linear models; Regression tree. |
| Ano: 2014 |
URL: http://www.alice.cnptia.embrapa.br/handle/doc/988756 |
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| BUENO FILHO, J.S. de S.; VENCOVSKY, R.. |
| Compararam-se diferentes formas de analise de experimentos em blocos inclompletos, abordadas como casos particulares de modelos mistos, quais sejam: (a) analise intrablocos, em que apenas o efeito do erro experimental e suposto aleatorio; (b) analise interblocos (latice), com efeitos de blocos supostos aleatorios; (c) analise BLUP, com efeitos de tratamentos supostos aleatorios, e (d) modelo aleatorio. Alem disso, montou-se a ANAVA, considerando duas alternativas: (e) usando o quadrado medio de tratamentos ajustado para blocos e o quadrado medio do erro efetivo do latice; (f) tomando as repeticoes como blocos completos. Um exemplo de analise de um teste de progenies de Eucalyptus grandis (Hill) Maiden ilustra as implicacoes da escolha dos modelos para fins... |
| Tipo: Artigo em periódico indexado (ALICE) |
Palavras-chave: Modelo linear; Delineamento experimentai; Linear models; Experimental designs. |
| Ano: 2000 |
URL: http://www.alice.cnptia.embrapa.br/handle/doc/101289 |
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| SCHWANCK, A. A.; MENESES, P. R.; FARIAS, C. R. J. de; FUNCK, G. R. D.; MAIA, A. de H. N.; PONTE, E. M. del. |
| The effect of increasing seed borne incidence levels (0, 3, 6, 12, 24 and 48 %) of Bipolaris oryzae on brown spot epidemics and crop performance was studied in eleven field trials. These trials were conducted at two sites (Bagé ? BA and Cachoeirinha ? CA) in the major rice-growing region of Brazil over three seasons (2008 to 2010). Disease variables assessed over time were disease incidence (INC, %) on leaves prior to flowering, and disease severity (SEV, %) on flag leaves after flowering. Kernel infection (KI, %) by B. oryzae was assessed after harvest. Crop-related variables such as plant population density (PD) and yield (YLD) were also assessed. In only three trials, all in the 2009/10 season, which had well above-normal rainfall in the early season,... |
| Tipo: Artigo em periódico indexado (ALICE) |
Palavras-chave: Generalized linear mixed model; Tolerance standards; Arroz; Mancha parda; Doença de planta; Modelo matemático; Oryza sativa; Seed pathology; Fungal brown spot; Linear models. |
| Ano: 2015 |
URL: http://www.alice.cnptia.embrapa.br/handle/doc/1038437 |
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| LESSA, L. S.; LEDO, C. A. da S.; SANTOS, V. da S.. |
| The use of cassava genotypes low-yield coupled with inappropriate harvest times lead to the country?s low average yield. This study aimed to evaluate the agronomic characteristics of cassava genotypes at different harvest times in the Recôncavo region of Bahia. The experiment was conducted during two crop cycles in Cruz das Almas, Bahia, with eight cassava genotypes (BRS Poti Branca, BRS Caipira, BRS Kiriris, BRS Verdinha, BRS Tapioqueira, 9624-09, 98150-06 and 9783-13) were evaluated at different harvest times. The characteristics yield of shoot, root, flour and starch, root dry matter and harvest index were evaluated, as well as their correlation with the harvest time. Data were submitted to analysis of variance and fitted to linear regression models.... |
| Tipo: Artigo em periódico indexado (ALICE) |
Palavras-chave: Fitomejoramiento; Yuca; Selección natural; Temporada de cosecha; Rendimiento de los cultivos; Análisis estadístico; Análisis de varianza; Análise de variância; Modelos lineales; Bahia; Recôncavo da Bahia (BA); Melhoramento Genético Vegetal; Mandioca; Manihot Esculenta; Seleção Genótipa; Características Agronômicas; Época de Colheita; Produtividade; Análise Estatística; Regressão Linear; Plant breeding; Cassava; Natural selection; Agronomic traits; Harvest date; Crop yield; Statistical analysis; Analysis of variance; Linear models. |
| Ano: 2019 |
URL: http://www.alice.cnptia.embrapa.br/alice/handle/doc/1108664 |
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| CAVALCANTE, D. H.; SOUSA JÚNIOR, S. C.; SILVA, L. P.; MALHADO, C. H. M.; MARTINS FILHO, R.; AZEVEDO, D. M. M. R.; CAMPELO, J. E. G.. |
| Different polynomial functions were tested for mean trajectory modeling with different residual variance structures. A total of 15,148 weight records of 3,115 Nellore Mocho cattle with ages between 1 and 660 days, raised in northern Brazil. First, the mean trajectory of cattle growth curve was fitted by a fixed regression using orthogonal polynomials with orders ranging from two to seven. Analyses were performed using the least-squares method, disregarding animal and/ or maternal random effects. Then, the best model was evaluated using different residual variance structures and homogeneous and heterogeneous classes. We considered as fixed effects those of groups of contemporary and of dam age at birth (as linear and quadratic covariate). The random model... |
| Tipo: Artigo em periódico indexado (ALICE) |
Palavras-chave: Curva média; Modelagem residual; Modelo linear; Parâmetro Genético; Regressão Linear; Linear models. |
| Ano: 2020 |
URL: http://www.alice.cnptia.embrapa.br/alice/handle/doc/1123435 |
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| Silva,Mário Henrique Magalhães Araújo da; Malhado,Carlos Henrique Mendes; Kern,Elisandra Lurdes; Daltro,Darlene dos Santos; Cobuci,Jaime Araujo; Carneiro,Paulo Luiz Souza. |
| ABSTRACT The objective of this study was to evaluate inbreeding depression in Holstein cows in Brazil, considering their 305-day milk production (MP), age of first calving (AFC), and calving interval (CI). The effects of inbreeding depression on the traits were determined using four regression models (linear, quadratic, exponential, and Michaelis-Menten) about the errors generated by the animal model. The linear model was significant for CI, and the quadratic model was significant for CI and AFC. The Michaelis-Menten and exponential models were significant for MP, AFC, and CI. Inbreeding depression affected MP and CI. Cows with inbreeding coefficient of 15% produced approximately 260 kg less milk than non-inbred cows. A 1% increase in the inbreeding level... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Calving interval; Inbreeding coefficient; Linear models; Non-linear models. |
| Ano: 2019 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-35982019000100307 |
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| Vidal, Luiz Vítor Oliveira; Programa de Pós Graduação em Zootecnia - Universidade Estadual de Maringá; Furuya, Wilson Massamitu; Departamento de Zootecnia - Universidade Estadual de Ponta Grossa; Martins, Elias Nunes; Departamento de Zootecnia - Universidade Estadual de Maringá; Xavier, Tadeu Orlandi; Programa de Pós Graduação em Zootecnia - Universidade Estadual de Maringá; Michelato, Mariana; Programa de Pós Graduação em Zootecnia - Universidade Estadual de Maringá; Graciano, Thêmis Sakaguti; Programa de Pós Graduação em Zootecnia - Universidade Estadual de Maringá. |
| The objective of this study was to formulate a mathematical model to estimate digestible energy in animal feeds for tilapia. Literature results were used of the proximate composition of crude protein, ether extract, mineral matter and gross energy, as well as digestible energy obtained in biological assays. The data were subjected to stepwise backward multiple linear regression. Path analysis was performed to measure the direct and indirect effects of each independent variable on the dependent one. To validate the model, data from independent studies and values obtained from a digestibility trial with juvenile Nile tilapia testing five meat and bone meals (MBM) were used, using the Guelph feces collecting system and chromium oxide (III) as an indicator.... |
| Tipo: Fieldwork |
Palavras-chave: 5.07.01.01-0 nutrition; Nutritional value; Estimate; Linear models. |
| Ano: 2012 |
URL: http://periodicos.uem.br/ojs/index.php/ActaSciAnimSci/article/view/13304 |
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| Vidal,Luiz Vítor Oliveira; Furuya,Wilson Massamitu; Martins,Elias Nunes; Xavier,Tadeu Orlandi; Michelato,Mariana; Graciano,Themis Sakaguti. |
| The objective of this study was to formulate mathematical models to estimate digestible protein in some animal feeds for tilapia. Literature results of the proximate composition of crude protein, ether extract, and mineral matter, as well as digestible protein obtained in biological assays, were used. The data were subjected to multiple linear stepwise backward regression. Path analysis was performed to measure the direct and indirect effects of each independent variable on the dependent one. To validate the model, the experience used data from independent studies and values obtained from a digestibility trial with juvenile Nile tilapia testing five meat and bone meals, using the Guelph feces collecting system and chromium oxide (III) as an indicator. The... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Chemical composition; Estimate; Feed; Linear models. |
| Ano: 2012 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-35982012000600005 |
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| ADAMI, A. C. de O.; OZAKI, V. A.. |
| O Programa de Subvenção ao Prêmio do Seguro Rural é um dos principais incentivos governamentais ao desenvolvimento do seguro rural no País. Em geral, os recursos alocados ao programa são estimados no Plano Trienal do Seguro Rural (2010?2012) e orçados no ano anterior ao ano de exercício, de acordo com os interesses do governo. O problema é que, desde 2009, os recursos orçados têm sido menores do que aqueles estimados no Plano Trienal, desacelerando, assim, o desenvolvimento do seguro. O estudo propõe o uso de metodologias estatísticas para prever o comportamento dos prêmios diretos e, com isso, calcular o montante adequado de subvenção. Os resultados mostram que os valores alocados ao PSR, em 2011, serão insuficientes para manter a tendência de crescimento... |
| Tipo: Artigo em periódico indexado (ALICE) |
Palavras-chave: Modelo linear; Modelo não linear; Previsão; Subvenção; Modelo de simulação; Linear models; Nonlinear models; Economic forecasting; Grants. |
| Ano: 2012 |
URL: http://www.alice.cnptia.embrapa.br/handle/doc/930813 |
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| Maçaneiro,João Paulo de; Oliveira,Laio Zimermann; Seubert,Rafaela Cristina; Eisenlohr,Pedro V.; Schorn,Lauri Amândio. |
| ABSTRACT The effect of environmental variables on the plant species distribution in the Atlantic Forest raises the interest of researchers, but few studies, mainly at local scales, analyzed the influence of spatial factors on the environment and species distribution. Linear models and spatial correlograms were used to evaluate whether environment and space may predict variations in species composition of trees and shrubs in a Subtropical Rainforest remnant. The study area was divided in 25 plots of 400 m², systematically distributed, where individuals with DBH ≥ 5 cm were measured. Elevation and slope were the most important predictors of the floristic variations, but space, generally neglected in researches on South American's vegetation, had a relevant... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Atlantic Forest; Environmental gradient; Linear models; Species distribution; Variance partitioning. |
| Ano: 2016 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0102-33062016000200183 |
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| Landell,Marcos Guimarães de Andrade; Prado,Hélio do; Vasconcelos,Antônio Carlos Machado de; Perecin,Dilermando; Rossetto,Raffaella; Bidoia,Márcio Aurélio Pitta; Silva,Marcelo de Almeida; Xavier,Mauro Alexandre. |
| In spite of the great homogeneity found in the morphological characteristics of Oxisols, there is great chemical diversity in subsurface layers of these soils. Studies indicate that crop yield presents significant correlation with the chemical attributes of the subsurface, which, are more stable than attributes found in the plough layer, subject to greater alterations as a consequence of agricultural exploration. This work evaluated the effects of subsurface chemical attributes of Oxisols of the South Central region of Brazil, on the yield of sugarcane clones and of variety RB72454, during the first, second and third cropping cycles. Productivity data were obtained between 1993 and 1998. Soils were characterized in terms of their mechanical analysis and... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Yield; Soils; Linear models; Chemical analysis. |
| Ano: 2003 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162003000400020 |
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| PADILHA, M. C. C.; VICENTE, L. E.; DEMATTÊ, J. A. M.; LOEBMANN, D. G. dos S. W.; URBINA SALAZAR, D.; KOGA-VICENTE, A.; ARAUJO, L. S. de; MANZATTO, C. V.. |
| Abstract: The quantification of soil organic carbon (SOC) is essential to agriculture and sustainable use of the land. However, there are difficulties to estimate it in large areas due to high cost of soil sample extraction, and laboratory preparations. There are approaches that may facilitate the estimation of SOC, such as the use of satellite imagery and the application of statistical models based on the spectral bands of the satellite under study. In July of 2017, this study proposed a prediction statistical model from optical-orbital data of the series Landsat, OLI sensor for estimating SOC content. |
| Tipo: Artigo em anais de congresso (ALICE) |
Palavras-chave: Linear regression; Landsat OLI; Carbono; Solo; Regressão Linear; Satélite; Soil organic carbon; Prediction; Regression analysis; Linear models. |
| Ano: 2019 |
URL: http://www.alice.cnptia.embrapa.br/alice/handle/doc/1119120 |
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| PAZIANOTTO, R. A. A.; MAIA, A. de H. N.. |
| Superfícies de resposta são modelos empíricos amplamente utilizados para descrever padrões de resposta de variáveis de interesse a variações em preditores contínuos. Um tipo de particular interesse para dados agrícolas é a superfície de resposta quadrática cujos preditores são os efeitos lineares dos fatores A e B, sua interação (AxB) e respectivos efeitos quadráticos (EDMONDSON, 1991; BARROS, 1999). Em experimentos com um grande número de variáveis-resposta, é comum que para algumas delas, a contribuição de algum efeito seja negligível, o que requer exclusão de preditores para obtenção de um modelo reduzido (PETTER et al, 2012). Os métodos tradicionais de seleção de preditores utilizados em regressão múltipla, como por exemplo, o stepwise, não podem ser... |
| Tipo: Artigo em anais de congresso (ALICE) |
Palavras-chave: Modelo empírico; Estatística agrícola; Regressão linear; Linear models; Agricultural statistics. |
| Ano: 2013 |
URL: http://www.alice.cnptia.embrapa.br/handle/doc/968680 |
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| HIKISHIMA, M.; MAIA, A. de H. N.; MAIA, A.; LOBO JUNIOR, M.. |
| Sclerotinia sclerotiorum é um fungo que tem causado epidemias de mofo branco em diversas regiões do país. Apotécios, produzidos através da germinação carpogênica de escleródios são considerados o inóculo inicial da doença. O objetivo deste estudo foi desenvolver um modelo de previsão para produção de apotécios em laboratório, determinando as relações entre temperatura do solo (10, 13, 15, 18, 20, 23, 25 e 30º C), umidade do solo (61, 68, 75, 82, 89, 95, 100, 105, 110, 115 e 120 % da capacidade de campo, CC) e escleródios germinados. O experimento foi conduzido em delineamento inteiramente aleatorizado, com arranjo fatorial 8 x 11 e quatro repetições. As parcelas foram compostas por 20 escleródios dispostos sobre 150g de solo, em embalagens de plástico... |
| Tipo: Artigo em anais de congresso (ALICE) |
Palavras-chave: Regressão logística; Fitossanidade; Mofo branco; Doença fúngica; Sclerotinia sclerotiorum; Epidemiologia; Fungal diseases of plants; Statistical models; Linear models. |
| Ano: 2011 |
URL: http://www.alice.cnptia.embrapa.br/handle/doc/915381 |
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| Registros recuperados: 19 | |
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