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  • 1
    In: Journal of Phytopathology, Wiley, Vol. 166, No. 9 ( 2018-09), p. 613-622
    Abstract: Brown eye spot (BES— Cercospora coffeicola ) is a major disease of coffee, and its occurrence is affected by water supply and nutritional balance. Little is known about the effect of phosphorous (P) on coffee fields under irrigation. Thus, this study evaluated the effect of the interaction between different water application levels and phosphorus levels (5 irrigation levels × 4 phosphorus levels) on the intensity of this disease. The area under the incidence progress curve (AUIPC) was calculated and subjected to analysis of variance. The progress curve of the average incidence of BES varied in both evaluation years. In Year 1 (November 2011 to December 2012), the incidence peaked on August 12, 2012 (22.45%), while in Year 2 (January 2013 to January 2014), the incidence reached its highest level on September 12, 2013 (16.29%). The exponential nonlinear model was adjusted for the two years. There was an interaction between irrigation and phosphorus levels on October 07, 2012. The incidence interacted significantly with the harvest dates. On the first evaluation date, an increase in phosphorus levels at shallower irrigation depths and an absence of phosphate fertilizer at higher irrigation levels caused higher incidences.
    Type of Medium: Online Resource
    ISSN: 0931-1785 , 1439-0434
    URL: Issue
    Language: English
    Publisher: Wiley
    Publication Date: 2018
    detail.hit.zdb_id: 2020539-9
    SSG: 12
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  • 2
    Online Resource
    Online Resource
    FapUNIFESP (SciELO) ; 2011
    In:  Ciência e Agrotecnologia Vol. 35, No. 1 ( 2011-02), p. 137-143
    In: Ciência e Agrotecnologia, FapUNIFESP (SciELO), Vol. 35, No. 1 ( 2011-02), p. 137-143
    Abstract: The objective of this study was to evaluate the effect of different irrigation controls implemented in four planting densities on a system of drip on the incidence and severity of rust and to assess the influence of leaf growth on the progress curve of this disease. The experiment was conducted in the experimental area of the Federal University of Lavras - MG, using the cultivar Rubi MG-1192 with 6 years. The experimental design was randomized blocks with four replicates. The treatments consisted of four tranches represented by planting densities (conventional and non-conventional): 2500 (4.0 x1.0 m), 3333 (3.0 x 1.0 m), 5000 (2.0 x 1.0 m), 10,000 (2.0 x 0.5 m) plants / ha, with four subplots: the tension when irrigation water in the soil reaches values of 20 and 60kPa; using water balance management of irrigation (calculated by the software IRRIPLUS) with rounds of irrigation fixed three days per week and a control without irrigation, making a total of 16 treatments. Each subplot line consisted of 10 plants with the six central plants considered as useful. The incidence and severity of rust and the percentage of grown of coffee plants were evaluated. After statistical analyses the data were converted to area under the curve of disease and growth progress. It was verified that the management of irrigation influenced the progress curve of growth, but it did not interfere in the progress curve of the incidence and severity of coffee rust. The dense system of plantation favored the incidence of rust. However, the planting densities did not affect growth.
    Type of Medium: Online Resource
    ISSN: 1413-7054
    Language: Unknown
    Publisher: FapUNIFESP (SciELO)
    Publication Date: 2011
    detail.hit.zdb_id: 2021028-0
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  • 3
    Online Resource
    Online Resource
    GN1 Sistemas e Publicacoes Ltd. ; 2016
    In:  REVISTA CIÊNCIA AGRONÔMICA Vol. 47, No. 2 ( 2016)
    In: REVISTA CIÊNCIA AGRONÔMICA, GN1 Sistemas e Publicacoes Ltd., Vol. 47, No. 2 ( 2016)
    Type of Medium: Online Resource
    ISSN: 1806-6690
    Language: English
    Publisher: GN1 Sistemas e Publicacoes Ltd.
    Publication Date: 2016
    detail.hit.zdb_id: 2572193-8
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  • 4
    In: Pesquisa Agropecuária Brasileira, FapUNIFESP (SciELO), Vol. 49, No. 2 ( 2014-02), p. 95-101
    Abstract: The objective of this work was to evaluate the effects of irrigation on leaf contents of P and Zn, on the yield, and on the growth of coffee plants (Coffea arabica) under traditional and high density planting. A randomized complete block design was used in split-plot arrangement, with four replicates. Plots consisted of planting density (3,333 and 10,000 plants ha-1), and subplots consisted of water depths applied according to four irrigation managements: beginning of irrigation whenever water tension at 0.25 m soil depth reached values near 20 or 60 kPa; fixed irrigation turn (three times a week), according to climatic water balance; and a control without irrigation. In 2009, 2010, and 2011, the following evaluations were done for: leaf concentrations of P and Zn; yield of processed coffee (bags ha-1); and lateral canopy area. Larger water irrigation depths favor root absorption of P and the vegetative growth of plants, on both traditional and high density planting systems, as well as productivity increase in the traditional system. Phosphorus increased availability for plants by greater irrigation depths decreases Zn concentration in the leaves.
    Type of Medium: Online Resource
    ISSN: 0100-204X
    Language: Unknown
    Publisher: FapUNIFESP (SciELO)
    Publication Date: 2014
    detail.hit.zdb_id: 2053197-7
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  • 5
    Online Resource
    Online Resource
    Brazilian Journal of Irrigation and Drainage - IRRIGA ; 2018
    In:  IRRIGA Vol. 1, No. 1 ( 2018-06-18), p. 140-
    In: IRRIGA, Brazilian Journal of Irrigation and Drainage - IRRIGA, Vol. 1, No. 1 ( 2018-06-18), p. 140-
    Abstract: MODELAGEM NÃO LINEAR DO CRESCIMENTO EM ALTURA DO CAFEEIRO IRRIGADO E NÃO IRRIGADO EM DIFERENTES DENSIDADES  ADRIELE APARECIDA PEREIRA1; TALES JESUS FERNANDES2; MYRIANE STELLA SCALCO3 E AUGUSTO RAMALHO DE MORAIS4 1Licenciada em Matemática, Mestre, DEX/UFLA, Lavras-MG, e-mail: adrieleapvga@yahoo.com.br2Licenciado em Matemática, Doutor, Prof. DEX/UFLA, Lavras-MG, e-mail: tales.jfernandes@dex.ufla.br3Engenheira Agrônoma, Doutora, DAG/UFLA, Lavras-MG, e-mail: msscalco@dag.ufla.br4Engenheiro Agrônomo, Doutor, Prof. DEX/UFLA, Lavras-MG, e-mail: armorais@dex.ufla.br  1 RESUMO Heterogeneidade de variâncias e autocorrelação residual são características inerentes à dados de crescimento ao longo do tempo que se não considerados nas análises podem conduzir a resultados imprecisos. Este estudo teve por objetivo comparar os ajustes dos modelos Logístico e Gompertz, considerando os métodos de mínimos quadrados: ordinários e generalizados. Os dados utilizados referem-se à altura de plantas do cafeeiro, submetidas aos regimes de irrigação Si (testemunha), 60 kPa e 140 kPa, nas densidades de plantio 2500 e 5000 plantas ha-1. Segundo o desvio padrão residual e a análise de resíduos, o ajuste do modelo Gompertz pelo método de mínimos quadrados generalizados, que incorpora a heterogeneidade de variâncias e autocorrelação residual na modelagem, apresentou os melhores resultados para todos os dados analisados, sendo indicado para modelar o crescimento em altura do cafeeiro ao longo do tempo. Os ajustes referentes às plantas irrigadas apresentaram as maiores estimativas para a altura assintótica, confirmando que a irrigação da lavoura proporciona maior crescimento das plantas. Palavras-Chave: Autocorrelação residual, Gompertz, Heterocedasticidade.  PEREIRA, A. A.; FERNANDES, T. J.; SCALCO, M. S.; MORAIS, A. R. de MODELING NONLINEAR GROWTH IN HEIGHT COFFEE WITH AND WITHOUT IRRIGATION IN DIFFERENT DENSITIES  2 ABSTRACT Heterogeneity of variance and residual autocorrelation characteristics are inherent in the growth data over time that is not considered in the analysis may lead to inaccurate results. This study aimed to compare the settings of the Logistic and Gompertz models, considering the methods of least squares: ordinary and generalized. The data used refer to the height of the coffee plants, subjected to irrigation systems Si (non irrigated), 60 kPa and 140 kPa, the planting densities in 2500 and 5000 plants ha-1. According to the residual standard deviation and the residual analysis, the fit of the Gompertz model by generalized least squares method, which incorporates the heterogeneity of residual variance and autocorrelation in modeling, showed the best results for all data analyzed, suitable for modeling the growth in height of the coffee over time. The adjustments related to the irrigated plants had the highest estimates for the asymptotic height, confirming that the crop irrigation provides greater plant growth. Keywords: Residual autocorrelation, Gompertz, Heteroscedasticity.
    Type of Medium: Online Resource
    ISSN: 1808-8546 , 1413-7895
    URL: Issue
    Language: Unknown
    Publisher: Brazilian Journal of Irrigation and Drainage - IRRIGA
    Publication Date: 2018
    detail.hit.zdb_id: 2410931-9
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  • 6
    Online Resource
    Online Resource
    Brazilian Journal of Irrigation and Drainage - IRRIGA ; 2019
    In:  IRRIGA Vol. 24, No. 2 ( 2019-06-27), p. 424-443
    In: IRRIGA, Brazilian Journal of Irrigation and Drainage - IRRIGA, Vol. 24, No. 2 ( 2019-06-27), p. 424-443
    Abstract: VIABILIDADE TÉCNICA E ECONÔMICA DO CAFEEIRO FERTIRRIGADO COM DIFERENTES CONCENTRAÇÕES DE FÓSFORO     RODRIGO CESAR DE ALMEIDA1; FÁBIO PONCIANO DE DEUS2; ADRIANO VALENTIM DIOTTO3; MYRIANE STELLA SCALCO4 E ALBERTO COLOMBO5   1 Departamento de Recursos Hídricos e Saneamento, Universidade Federal de Lavras, Campus Universitário, Caixa Postal 3037, CEP 37200-000, Lavras, Minas Gerais, Brasil. eng_rodrigocesar@yahoo.com.br 2 Departamento de Recursos Hídricos e Saneamento, Universidade Federal de Lavras, Campus Universitário, Caixa Postal 3037, CEP 37200-000, Lavras, Minas Gerais, Brasil. fabio.ponciano@deg.ufla.br 3 Departamento de Recursos Hídricos e Saneamento, Universidade Federal de Lavras, Campus Universitário, Caixa Postal 3037, CEP 37200-000, Lavras, Minas Gerais, Brasil. adriano.diotto@deg.ufla.br 4 Departamento de Recursos Hídricos e Saneamento, Universidade Federal de Lavras, Campus Universitário, Caixa Postal 3037, CEP 37200-000, Lavras, Minas Gerais, Brasil. stellascalco@gmail.com 5 Departamento de Recursos Hídricos e Saneamento, Universidade Federal de Lavras, Campus Universitário, Caixa Postal 3037, CEP 37200-000, Lavras, Minas Gerais, Brasil. acolombo@deg.ufla.br     1 RESUMO   Muitos trabalhos têm mostrado que o cafeeiro é responsivo a elevadas dosagens de fósforo, contrariando as principais recomendações vigentes. Assim, objetivou-se avaliar o desempenho técnico e econômico do cafeeiro fertirrigado com doses de fósforo e lâminas de irrigação. O cafeeiro estudado foi o da espécie arábica, cultivar Topázio MG-1190. O experimento foi implantado em janeiro de 2010, com diferenciação dos tratamentos a partir de novembro de 2011, obtendo-se a primeira produção em 2012, e as demais nas duas safras subsequentes (2013 e 2014). O delineamento experimental foi em blocos casualizados no esquema fatorial 5x4, sendo os tratamentos compostos por cinco frações (Ki) da lâmina de irrigação requerida (0,4, 0,7, 1,0 1,3 e 1,6), quatro doses de fósforo (0, 80, 240 e 720 kg ha-1 de - P2O5) e quatro repetições. Em resumo, observou-se que os tratamentos referentes às menores lâminas de irrigação e dosagens de fósforo foram suficientes para suprir as demandas da cultura. As doses de fósforo de 240 kg ha-1 associado a frações acima de 0,7, e doses de 720 kg ha-1, apresentaram-se inviável economicamente. Verificou-se que possivelmente solos com ótimos níveis de fósforo o cafeeiro não responde a adubação fosfatada suplementar.   Palavras-chave: adubação fosfatada, custo de produção, coffea arabica     ALMEIDA, R. C.; DE DEUS. F. P.; DIOTTO, A. V.; SCALCO, M. S.; COLOMBO, A. TECHNICAL AND ECONOMIC PERFORMANCE OF FERTIRRIGATED COFFEE WITH DIFFERENT PHOSPHORUS CONCENTRATION     2 ABSTRACT   Many studies show coffee crop as a responsive plant when high doses of phosphorus (P) are applied, contradicting the current fertilization recommendation. Therefore, this study aim was to evaluate technically and economically the application of doses of phosphorus with different irrigation depths in a soil that already has high level of fertility. Arabica coffee variety Topázio MG-1190 was planted in January 2010 and the treatments variation started in November 2011. The first harvest was 2012 following by other two in 2013 and 2014. The experimental design was random blocks in factorial 5x4x4. The five irrigation depths used were based on (Ki) fraction of irrigation requirement (0.4, 0.7, 1.0, 1.3 and 1.6), the four levels of phosphorus applied were (0, 80, 240 and 720 kg ha-1 of P2O5), and four replicates were used. The treatments using lower irrigation depth and phosphorus doses showed to be enough to supply crop demand. Doses of 240 kg ha-1 associated with fractions higher than 0.7 were economically infeasible, showing that in soils already containing high levels of phosphorus, the coffee crop does not respond to supplemental application of this element.   Keywords: phosphate fertilization, production cost, Coffea arabica
    Type of Medium: Online Resource
    ISSN: 1808-8546 , 1808-3765
    Language: Unknown
    Publisher: Brazilian Journal of Irrigation and Drainage - IRRIGA
    Publication Date: 2019
    detail.hit.zdb_id: 2410931-9
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  • 7
    Online Resource
    Online Resource
    IFSULDEMINAS (Instituto Federal do Sul de Minas) ; 2009
    In:  Revista Agrogeoambiental Vol. 1, No. 1 ( 2009-04-01)
    In: Revista Agrogeoambiental, IFSULDEMINAS (Instituto Federal do Sul de Minas), Vol. 1, No. 1 ( 2009-04-01)
    Type of Medium: Online Resource
    ISSN: 2316-1817 , 1984-428X
    Language: Unknown
    Publisher: IFSULDEMINAS (Instituto Federal do Sul de Minas)
    Publication Date: 2009
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  • 8
    In: Revista Ciência Agronômica, FapUNIFESP (SciELO), Vol. 46, No. 1 ( 2015-03), p. 126-134
    Type of Medium: Online Resource
    ISSN: 1806-6690
    Language: English
    Publisher: FapUNIFESP (SciELO)
    Publication Date: 2015
    detail.hit.zdb_id: 2572193-8
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  • 9
    Online Resource
    Online Resource
    Brazilian Journal of Irrigation and Drainage - IRRIGA ; 2013
    In:  IRRIGA Vol. 18, No. 4 ( 2013-12-09), p. 743-
    In: IRRIGA, Brazilian Journal of Irrigation and Drainage - IRRIGA, Vol. 18, No. 4 ( 2013-12-09), p. 743-
    Type of Medium: Online Resource
    ISSN: 1808-3765 , 1808-3765
    URL: Issue
    Language: Unknown
    Publisher: Brazilian Journal of Irrigation and Drainage - IRRIGA
    Publication Date: 2013
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  • 10
    In: Pesquisa Agropecuária Brasileira, FapUNIFESP (SciELO), Vol. 46, No. 1 ( 2011-01), p. 9-16
    Abstract: The objective of this study was to evaluate the most adequate parceling and dose of nitrogen and potassium for the first and second years of coffee shrub (Coffea arabica) formation, under a drip fertigation system, in southern Minas Gerais, Brazil. Two experiments with high plant density (6.666 plants ha-1) were carried out simultaneously: in one of them, the fertilization was done in 4 applications yearly, and in the other one, in 12 applications. A randomized block design was used with five treatments and four replicates in both experiments. Treatments consisted of N and K2O doses applied via fertigation: 70, 100, 130, 160 and 190% from the N and K2O recommended doses for the rainfed cropping. A control treatment was carried out in rainfed conditions and fertilized with the standard dose (100%). In the first and second years, in both parceling types, there were no significant differences among doses regarding coffee shrub vegetative growth. Parceling into 12 applications is more suitable for fertilization at both first and second years after planting. Fertigated coffee shrubs at the formation phase have higher growth and demand less nitrogen and potassium fertilization than the ones in rainfed conditions.
    Type of Medium: Online Resource
    ISSN: 0100-204X
    Language: Unknown
    Publisher: FapUNIFESP (SciELO)
    Publication Date: 2011
    detail.hit.zdb_id: 2053197-7
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