Modelo de regressão para a previsão de produdividade de cafeeiros no Estado de Minas Gerais

Carvalho, Luiz Gonsaga de; Sediyama, Gilberto Chohaku; Cecon, Paulo R.; Alves, Helena Maria Ramos

doi:10.1590/s1415-43662004000200007

Cited by 15 publications

(8 citation statements)

References 3 publications

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“…The used criteria in selecting the principal interpreted components was on the percentage of variance explained. According to Carvalho et al (2004) choose the first components that accumulate a variance explained percentage of about 70%. The correlation matrix was composed of 11 variables measured at 67 points.…”

Section: Methodsmentioning

confidence: 99%

Discrimination of geomorphic surfaces with multivariate analysis of soil attributes in sandstone - basalt lithosequence

Campos¹,

Júnior²,

Souza³

et al. 2012

Rev. Ciênc. Agron.

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The geomorphic surface concept allows interrelationship among various branches of soil sciences, such as geology, geomorphology and pedology. This association enhances the understanding of spatial soil distribution through landscape, pointing out the soil attributes behavior, which are mainly related to stratigraphy and relief forms. Therefore, this study aims to apply multivariate statistics to categorize geomorphic surfaces in sandstone-basalt lithosequence, so as to provide a basis for soil assessment in similar areas. The study area is located in Pereira Barreto County, SP, Brazil. An area of 530 hectare was selected, where three geomorphic surfaces (I, II and III) were located and mapped. In this area, 134 soil samples were collected at depths of 0.0-0.2 m and 0.8-1.0 m below ground surface. Sand, silt and clay contents were determined, pH in CaCl 2 solution, OM, P, Ca, Mg, K, Al and H+Al contents were also evaluated. Based on the results, univariate, multivariate analysis of variance, cluster and principal-component analysis were performed in order to compare the three geomorphic surfaces. The univariate statistical analysis of soil attributes was not efficient enough to categorize the three geomorphic surfaces. By using the physical and chemical soil properties, the multivariate statistical techniques enabled the differentiation of the three groups of soil natural bodies which were equivalent to the same three mapped geomorphic surfaces (GS). These results are interestingin order to demonstrate the feasibility of the numerical classification use on geomorphic surfaces to assist the soil mapping.

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Section: Methodsmentioning

confidence: 99%

Discrimination of geomorphic surfaces with multivariate analysis of soil attributes in sandstone - basalt lithosequence

Campos¹,

Júnior²,

Souza³

et al. 2012

Rev. Ciênc. Agron.

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“…Do balanço hídrico, a variável mais importante para a definição de riscos é a relação entre a evapotranspiração real e a evapotranspiração de referência (ETr/ETo), denominada evapotranpiração relativa, por ser um indicador de atendimento da necessidade de água pela planta. Esta relação tem sido amplamente utilizada em trabalhos com modelos agrometeorológicos que relacionam fatores hídricos e produção de café (CARVALHO et al, 2004;PICINI et al, 1999;SANTOS;CAMARGO, 2006) todos baseados nos apontamentos de Camargo e Pereira (1994) que utilizam Kc igual à unidade em trabalhos de caráter climatológico para a cultura do café. A justificativa pra seu uso está baseada em literaturas que apresentam valores próximos à unidade ou variação desses valores em função de espaçamento de café, variedades ou manejo da entrelinha (ARRUDA et al,2000;RENA;MAESTRI 2000;VILLA NOVA et al, 2002).…”

Section: Methodsunclassified

“…Para a cultura do café o atendimento hídrico tem sido expresso pela relação entre a evapotranspiração real e a evapotranspiração de referencia ou potencial, denominada evapotranspiração relativa (CARVALHO et al, 2004;SANTOS;CAMARGO, 2006).…”

Section: Introductionunclassified

Zoneamento de risco climático para a cultura do café Conilon no Estado do Espírito Santo

Pezzopane¹,

Castro²,

Pezzopane³

et al. 2010

Rev. Ciênc. Agron.

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Resumo -O presente trabalho teve por objetivo apresentar um zoneamento de risco climático, baseado no atendimento hídrico para o café Conilon para o estado do Espírito Santo, em função da variação das necessidades de água nas fases fenológicas do florescimento, granação dos frutos e crescimento vegetativo. Foi realizada para cada fase fenológica uma análise frequencial da evapotranspiração relativa, obtida pela relação entre as evapotranspirações real e de referência, provenientes de um modelo de balanço hídrico sequencial. Posteriormente procedeu-se a espacialização de riscos climáticos de atendimento hídrico para o café Conilon considerando simultaneamente as fases fenológicas da floração, granação e crescimento vegetativo. Os resultados indicaram que devido à característica heterogênea do regime pluviométrico, associada às diferentes demandas hídricas, ocorre uma variação espacial do risco climático ao atendimento hídrico no Estado e que a partir da análise simultânea de atendimento hídrico nas diferentes fases fenológicas do café Conilon, identificou-se que 58% da área do Espírito Santo, concentrada principalmente na região norte, apresenta alto risco climático nas fases vegetativa do florescimento, granação e crescimento vegetativo. Palavras-chave -Balanço Hídrico. Granação. Florescimento. Evapotranspiração.Abstract -A frequencial analysis of the crop water requirement index of the Conilon coffee (Coffea canephora), determined for the occurrence of relative evapotranspiration (ETr/ETo) ≥ 0.65 above 80% of the years, was carried through for the phenological stages of the flowering, bean formation and vegetative growth. The areas with climatic risk of water deficit were zoned by a geographic information system considering simultaneously the three phenological stages. The results showed that due to heterogeneous rain characteristics, associate to the different water requirements, occurs a space variation of the climatic risk to the water required in the State. In analysis of water required in the different phonological stages of the Conilon coffee, it was identified that 58% of the area of the state of Espirito Santo, mainly in the north part, presents high climatic risk of water required in the phases of the flowering, bean formation and vegetative growth.

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“…The principal components 1 and 2 were selected according to the percentage of explained variance, where the accumulated variance of the components should be less than 70% (CARVALHO et al, 2004). The R software was used in the analysis (IHAKA; GENTLEMAN, 1996).…”

Section: The Chemical Attributes (Mo Hmentioning

confidence: 99%

Forms of soil organic phosphorus at black earth sites in the Eastern Amazon

Costa

Júnior

Kern

et al. 2017

Revista Ciência Agronômica

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Modelo de regressão para a previsão de produdividade de cafeeiros no Estado de Minas Gerais

Cited by 15 publications

References 3 publications

Discrimination of geomorphic surfaces with multivariate analysis of soil attributes in sandstone - basalt lithosequence

Discrimination of geomorphic surfaces with multivariate analysis of soil attributes in sandstone - basalt lithosequence

Zoneamento de risco climático para a cultura do café Conilon no Estado do Espírito Santo

Forms of soil organic phosphorus at black earth sites in the Eastern Amazon

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