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Bromeliads production in greenhouses associated to different shading screens Horticultura Brasileira
Holcman,Ester; Sentelhas,Paulo Cesar.
Bromeliads production in greenhouses is highly influenced by microclimate, which affects plants growth and development. Based on that, this study aimed to evaluate the influence of shading screens of different colors on microclimatic variables and Aechmea fasciata bromeliad growth in a greenhouse covered by transparent low-density polyethylene. The experiment had five treatments, with screens of different colors, inside a plastic greenhouse: thermo-reflective (T1); control without screen (T2); red (T3); blue (T4); and black (T5) screens, all of them with 70% of shading. From the 60 plants arranged in each one of the treatments 24 were evaluated, which were obtained randomly. The statistical design was completely randomized for the biometric variables. An...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Aechmea fasciata; Plant growth; Solar radiation; Air temperature.
Ano: 2013 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0102-05362013000300008
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Modeling of corn yield in Brazil as a function of meteorological conditions and technological level PAB
Monteiro,José Eduardo Boffino de Almeida; Assad,Eduardo Delgado; Sentelhas,Paulo Cesar; Azevedo,Letícia da Costa.
Abstract: The objective of this work was to develop and evaluate a method for estimating corn yield using a minimum number of parameters and limited information about crop management. The proposed method estimates potential and attainable yields based on the technological level of the production systems and on relatively simple agrometeorological models. Corn yield was estimated for the crop seasons from 2000/2001 to 2007/2008, considering several locations and regions in Brazil, and was compared with the actual yield data from official surveys. There was a high correlation between the estimated and observed yield (0.76≤R2<0.92; p<0.01), with model efficiency (E1’) ranging from 0.45 to 0.73; mean relative error (MRE) between -0.9 and 2.4%; and mean...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Zea mays; Large-area crop modeling; Paremetrization; Risk analysis; Technological potential yield; Yield forecast.
Ano: 2017 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-204X2017000300137
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Brazilian maize genotypes sensitivity to water deficit estimated through a simple crop yield model PAB
Andrioli,Kleber Gustavo; Sentelhas,Paulo Cesar.
The objective of this work was to determine the sensitivity of maize (Zea mays) genotypes to water deficit, using a simple agrometeorological crop yield model. Crop actual yield and agronomic data of 26 genotypes were obtained from the Maize National Assays carried out in ten locations, in four Brazilian states, from 1998 to 2006. Weather information for each experimental location and period were obtained from the closest weather station. Water deficit sensitivity index (Ky) was determined using the crop yield depletion model. Genotypes can be divided into two groups according to their resistance to water deficit. Normal resistance genotypes had Ky ranging from 0.4 to 0.5 in vegetative period, 1.4 to 1.5 in flowering, 0.3 to 0.6 in fruiting, and 0.1 to 0.3...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Zea mays; Agrometeorology; Drought resistance; Water balance.
Ano: 2009 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-204X2009000700001
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Sensibilidade de laranjeiras-doces ao deficit hídrico PAB
Ramos,Yuri Caires; Mourão Filho,Francisco de Assis Alves; Stuchi,Eduardo Sanches; Sentelhas,Paulo Cesar; Fadel,André Luiz.
Resumo: O objetivo deste trabalho foi avaliar a sensibilidade ao deficit hídrico de 17 seleções de laranja-doce enxertadas sobre tangerineira 'Sunki', ao longo de cinco safras. Empregou-se um modelo agrometeorológico de penalização da produtividade pelo deficit hídrico, tendo-se avaliado a relação entre os valores estimados e observados. As seleções podem ser classificadas como de alta, média e baixa sensibilidade ao deficit hídrico, classificação que é inédita para as condições brasileiras. A sensibilidade ao deficit hídrico foi classificada como alta nas seleções de laranja-doce 'Pera Milton Teixeira', 'Pera IAC', 'IAC 2000', Pera 2, 'IAC 420 Seleta Rio' e Pera 3, e baixa nas seleções 'Bidwells Bar', 'IPR Jaffa', 'Torregrosa' e 'Sanguínea'.
Tipo: Info:eu-repo/semantics/article Palavras-chave: Citrus sinensis; Modelo agrometeorológico; Penalização da produtividade.
Ano: 2016 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-204X2016000100086
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Produtividade e características biométricas do capim-braquiária em sistema silvipastoril PAB
Bosi,Cristiam; Pezzopane,José Ricardo Macedo; Sentelhas,Paulo Cesar; Santos,Patrícia Menezes; Nicodemo,Maria Luiza Franceschi.
O objetivo deste trabalho foi avaliar a produtividade e as características biométricas do capim-braquiária (Urochloa decumbens) sob pastejo, em sistema silvipastoril. Avaliou-se um sistema com árvores nativas de interesse comercial, plantadas em renques, no sentido norte-sul, espaçados por 17 m. Utilizou-se o delineamento experimental de blocos ao acaso, com quatro repetições e parcelas subdivididas, tendo-se avaliado o ciclo de rebrota da forragem nas parcelas, e a distância desta em relação aos renques, nas subparcelas. Sete ciclos de rebrota foram avaliados, em quatro distâncias dos renques: a 2 e a 6 m do renque leste, e a 2 e a 6 m do renque oeste. Quantificou-se a produtividade de matéria seca, o índice de área foliar (IAF), a área foliar específica...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Urochloa decumbens; Árvores nativas; Deficit hídrico; Radiação solar; Sistemas agroflorestais; Sombreamento.
Ano: 2014 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-204X2014000600449
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Rice yield estimation based on weather conditions and on technological level of production systems in Brazil PAB
Monteiro,José Eduardo Boffino de Almeida; Azevedo,Letícia da Costa; Assad,Eduardo Delgado; Sentelhas,Paulo Cesar.
The objective of this work was to evaluate an estimation system for rice yield in Brazil, based on simple agrometeorological models and on the technological level of production systems. This estimation system incorporates the conceptual basis proposed by Doorenbos &amp; Kassam for potential and attainable yields with empirical adjusts for maximum yield and crop sensitivity to water deficit, considering five categories of rice yield. Rice yield was estimated from 2000/2001 to 2007/2008, and compared to IBGE yield data. Regression analyses between model estimates and data from IBGE surveys resulted in significant coefficients of determination, with less dispersion in the South than in the North and Northeast regions of the country. Index of model...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Crop simulation model; Crop yield forecast; Model efficiency; Water deficit.
Ano: 2013 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-204X2013000200001
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Simulação do risco de deficit hídrico em regiões de expansão do cultivo de cana-de-açúcar no Brasil PAB
Vianna,Murilo dos Santos; Sentelhas,Paulo Cesar.
O objetivo deste trabalho foi determinar o risco de deficit hídrico para a cultura da cana-de-açúcar em diferentes regiões brasileiras, com foco nas áreas de expansão. Para tanto, utilizou-se o modelo CSM-Canegro, para simular a produtividade da cana-planta de 12 meses, em 30 localidades. A partir dos valores estimados de produtividades potencial e atingível (produtividade sem irrigação), definiram-se as classes de risco de deficit hídrico de acordo com os níveis de eficiência climática, dada pela razão entre essas produtividades. O modelo simulou o efeito dos diferentes tipos de solo e datas de plantio sobre a produtividade, o que possibilitou caracterizar o risco de deficit hídrico associado à cultura. A região de maior risco é Petrolina, PE, enquanto as...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Saccharum; DSSAT; Eficiência climática; Produtividade potencial; Risco climático; Zoneamento climático.
Ano: 2014 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-204X2014000400237
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Risco climático para ocorrência de doenças fúngicas da videira no Sul e Sudeste do Brasil Rev. Ciênc. Agron.
Shimano,Iris Satie Hayashi; Sentelhas,Paulo Cesar.
A ocorrência de doenças fúngicas na videira é fortemente influenciada pelas condições climáticas. No Brasil, a videira Vitis labrusca é cultivada em diversas regiões, desde o Rio Grande do Sul até o norte de Minas Gerais, as quais apresentam distintas características climáticas e, consequentemente, requerem diferentes estratégias de controle das doenças fúngicas. Com base nisto, o objetivo deste trabalho foi determinar o risco climático de ocorrência de doenças fúngicas em diferentes regiões produtoras do Sul e Sudeste do Brasil, utilizando um modelo de previsão de pulverizações, baseado na ocorrência de chuva. Para tanto, foram empregados dados pluviométricos diários de séries históricas de 30 anos das regiões de Manga (MG), Jales (SP), Jundiaí (SP), São...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Videira; Plantas-doenças e pragas; Vegetação e clima.
Ano: 2013 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1806-66902013000300015
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Climatic risk for potato late blight in the Andes region of Venezuela Scientia Agricola
Garcia,Beatriz Ibet Lozada; Sentelhas,Paulo Cesar; Tapia,Luciano Roberto; Sparovek,Gerd.
Potato is an important crop for Venezuelan agriculture. However, its production is highly affected by late blight (Phytophtora infestans), since weather is commonly favorable for this disease. The aim of this study was to determine the sowing dates of low climatic risk for potato late blight in the Andes region of Venezuela, with an agrometeorological disease model and geographical information system (GIS) tools. The disease model used in this study was developed by Hyre (1954) which requires daily rainfall and temperature data which were obtained from 106 weather stations, located at the States of Mérida, Táchira, and Trujillo, for a period of 31 years. Hyre's model was applied for all stations obtainig the following variables: number of disease favorable...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Phytophtora infestans; Hyre's model; Temperature; Rainfall.
Ano: 2008 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162008000700007
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Calibration and test of the cropgro-dry bean model for edaphoclimatic conditions in the savanas of Central Brazil Scientia Agricola
Meireles,Elza Jacqueline Leite; Pereira,Antonio Roberto; Sentelhas,Paulo Cesar; Stone,Luis Fernando; Zimmermann,Francisco José Pfeilsticker.
Simulation models are important tools for the analysis of cultivated systems to estimate the performance of crops in different environments. The CROPGRO- model (DSSAT) was calibrated and validated using Carioca bean (Phaseolus vulgaris L.) to estimate yield and the development of the crop, sown in three row spacings (0.4, 0.5, and 0.6 m) and two fertilization rates (300 and 500 kg ha-1 of 4-30-16 N-P-K), in Santo Antônio de Goiás, GO, Brazil. To calibrate the model a combination of the genetic coefficients that characterize the phenology and morphology of the dry bean crop was used to obtain the best possible fit between predicted and observed anthesis and physiological maturity dates, leaf area index (LAI), total dry matter (TDM), yield components, and...
Tipo: Info:eu-repo/semantics/article Palavras-chave: DSSAT; Dry bean; Simulation.
Ano: 2002 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162002000400016
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Estimating leaf wetness duration over turfgrass, and in a 'Niagara Rosada' vineyard, in a subtropical environment Scientia Agricola
Lulu,Jorge; Sentelhas,Paulo Cesar; Pedro Júnior,Mário José; Pezzopane,José Ricardo Macedo; Blain,Gabriel Constantino.
Leaf wetness duration (LWD) is a key parameter in agrometeorology because it is related to plant disease occurrence. As LWD is seldomly measured in a standard weather station it must be estimated to run warning systems for schedule chemical disease control. The objective of the present study was to estimate LWD over turfgrass considering different models with data from a standard weather station, and to evaluate the correlation between estimated LWD over turfgrass and LWD measured in a 'Niagara Rosada' vineyard, cultivated in a hedgerow training system, in Jundiaí, São Paulo State, Brazil. The wetness sensors inside the vineyard were located at the top of the plants, deployed at an inclination angle of 45º and oriented southwest, with three replications....
Tipo: Info:eu-repo/semantics/article Palavras-chave: Vitis labrusca; LWD estimate; Relative humidity; Dew point temperature.
Ano: 2008 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162008000700004
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Perda de rendimento potencial da cultura do girassol por deficiência hídrica, no Estado de São Paulo Scientia Agricola
Marin,Fábio Ricardo; Sentelhas,Paulo Cesar; Ungaro,Maria Regina Gonçalves.
O presente trabalho teve por objetivo estimar a perda potencial de rendimento para 36 épocas de semeadura, para a cultura do girassol, em três localidades do Estado de São Paulo: Piracicaba, Ribeirão Preto e Manduri. As estimativas basearam-se nas chances de atendimento das exigências hídricas da cultura e, para tanto, utilizou-se o método da "Zona Agroecológica" para estimativa do rendimento potencial, e o método da FAO de Doorenbos &amp; Kassam, para o cálculo da quebra relativa de rendimento devida à deficiência hídrica, a qual foi estimada pelo balanço hídrico da cultura. Utilizando-se séries históricas que variaram de 28 a 40 anos, foram obtidos resultados que possibilitaram identificar épocas de semeadura de menores riscos para o cultivo do...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Helianthus annus; Época de semeadura; Balanço hídrico.
Ano: 2000 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162000000100002
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Environmental group identification for upland rice production in central Brazil Scientia Agricola
Heinemann,Alexandre Bryan; Sentelhas,Paulo Cesar.
Upland rice (Oryza sativa L.) production is basically concentrated in four central Brazilian States, Mato Grosso, Goiás, Rondônia and Tocantins. To reduce the genotype and environment (G × E) interactions, the classification of environment groups was proposed. The goal of this study explores possibilities to adjust the upland rice regional breeding systems to optimally fit to the range of environments they are targeting, based on a historical yield data set of the Brazilian Geographic and Statistics Institute (IBGE, www.ibge.gov.br/home/) from 54 microregions. The specific objectives of this study were: (i) to identify and classify environmental groups in the Brazilian upland rice production area; (ii) to validate these environmental groups using yield...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Environment classification; Breading program; Cluster analysis; Yield.
Ano: 2011 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162011000500005
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Obtaining weather data for input to crop disease-warning systems: leaf wetness duration as a case study Scientia Agricola
Gleason,Mark L.; Duttweiler,Katrina B.; Batzer,Jean C.; Taylor,S. Elwynn; Sentelhas,Paulo Cesar; Monteiro,José Eduardo Boffino Almeida; Gillespie,Terry J..
Disease-warning systems are decision support tools designed to help growers determine when to apply control measures to suppress crop diseases. Weather data are nearly ubiquitous inputs to warning systems. This contribution reviews ways in which weather data are gathered for use as inputs to disease-warning systems, and the associated logistical challenges. Grower-operated weather monitoring is contrasted with obtaining data from networks of weather stations, and the advantages and disadvantages of measuring vs. estimating weather data are discussed. Special emphasis is given to leaf wetness duration (LWD), not only because LWD data are inputs to many disease-warning systems but also because accurate data are uniquely challenging to obtain. It is concluded...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Integrated pest management; Site-specific weather data; Disease forecasting; Disease prediction; Sustainable agriculture.
Ano: 2008 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162008000700013
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Climate changes and technological advances: impacts on sugarcane productivity in tropical southern Brazil Scientia Agricola
Gouvêa,Júlia Ribeiro Ferreira; Sentelhas,Paulo Cesar; Gazzola,Samuel Thomazella; Santos,Marcelo Cabral.
The climatic projections for this century indicate the possibility of severe consequences for human beings, especially for agriculture where adverse effects to productivity of crops and to agribusiness as a whole may occur. An agrometeorological model was used to estimate sugarcane yield in tropical southern Brazil, based on future A1B climatic scenarios presented in the fourth Intergovernmental Panel on Climate Change report, in 2007. Sugarcane yield was evaluated for 2020, 2050, and 2080 considering the possible impacts caused by changes in temperature, precipitation, sunshine hours and CO2 concentration in the atmosphere, as well as technological advances. Increasingly higher temperatures will cause an increase of the potential productivity (PP), since...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Global warming; Water balance; Agrometeorological model; Sugarcane yield.
Ano: 2009 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162009000500003
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Performance of cylindrical leaf wetness duration sensors in a tropical climate condition Scientia Agricola
Santos,Eduardo Alvarez; Sentelhas,Paulo Cesar; Gillespie,Terry James; Lulu,Jorge.
Leaf wetness duration (LWD) measurements are required for disease warning in several agricultural systems, since it is an important variable for the diagnose of plant disease epidemiology. The cylindrical sensor is an inexpensive and simple electronic LWD sensor initially designed to measure this variable for onions, however some studies show that it may be helpful for standard measurements in weather stations and also for different crops. Therefore, the objective of this study was to assess their performance under tropical climate conditions, in Brazil, having as standard measurements those obtained by flat plate sensors, which have presented very good performance when compared with visual observations. Before field assessments, all LWD sensors used in...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Deployment angle; Electronic sensors; Dew; Rain; Disease-warning systems.
Ano: 2008 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162008000700003
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Climatic effects on sugarcane ripening under the influence of cultivars and crop age Scientia Agricola
Cardozo,Nilceu Piffer; Sentelhas,Paulo Cesar.
The lack of information about the effects of cultivars, crop age and climate on the sugarcane (Saccharum ssp.) crop yield and quality has been the primary factor impacting the sugar-ethanol sector in Brazil. One of the processes about which we do not have a satisfactory understanding is sugarcane ripening and the effects of cultivars, crop age and climate on that. Sugarcane ripening is the process of sucrose accumulation in stalks, which is heavily influenced by several factors, mainly by climatic conditions such as air temperature and water deficits. Because it is a complex process, studies of the variables involved in sugarcane ripening can provide important information, resulting in a better use of commercial cultivars, bringing advantages to growers,...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Saccharum spp; Air temperature; Precipitation; Water deficit; Sucrose.
Ano: 2013 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162013000600011
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Agrometeorology and plant disease management: a happy marriage Scientia Agricola
Gillespie,Terry James; Sentelhas,Paulo Cesar.
Many plant disease outbreaks are triggered by suitably warm temperatures during periods of leaf wetness. Measurements or estimations of leaf wetness duration provided by Agrometeorologists have allowed Plant Pathologists to devise weather timed spray schemes which often reduce the number of sprays required to control plant diseases, thus lowering costs and benefitting the environment. In the near future, tools such as numerical weather models with small grid spacings, and improved weather radar, are expected to reduce the need for tight networks of surface observations. The weather models will also provide growers with forecast warnings of potential upcoming disease outbreaks, which will further enhance the contribution of agrometeorology to plant disease...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Leaf wetness duration; Temperature; Disease warning systems.
Ano: 2008 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162008000700012
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Editorial Scientia Agricola
Sentelhas,Paulo Cesar; Reichardt,Klaus; Alleoni,Luís Reynaldo Ferraciú.
Tipo: Info:eu-repo/semantics/other
Ano: 2008 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162008000700001
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Spatial variability of leaf wetness duration in cotton, coffee and banana crop canopies Scientia Agricola
Santos,Eduardo Alvarez; Sentelhas,Paulo Cesar; Pezzopane,José Eduardo Macedo; Angelocci,Luiz Roberto; Monteiro,José Eduardo Boffino Almeida.
Despite the importance of leaf wetness duration for plant disease epidemiology, there has been little attention paid to research on how its variability relates to different cropping situations. The objective of this study was to evaluate the spatial variability of leaf wetness duration (LWD) in three crops, comparing these measurements with turfgrass LWD, obtained in a standard weather station. LWD was measured by electronic sensors in three crops with different canopy structures and leaf area: cotton, coffee and banana. For the cotton crop, cylindrical sensors were deployed at the lower third and on the top of the canopy, facing southwest. For the coffee crop, flat plate sensors were installed in the lower third of the canopy facing northeast and...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Dew; Microclimate; Plant disease; Warning systems.
Ano: 2008 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162008000700005
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