Estimativa da distribuição da energia solar no Estado de São Paulo

Cervellini, Admar; Salati, Enéas; Godoy, Hernani

doi:10.1590/s0006-87051966000100003

Cited by 18 publications

(9 citation statements)

References 4 publications

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“…The global solar radiation flux density (Qg) was estimated taking into account the mean values of a and b Angstrom's coefficients obtained by CERVELLINI et al (1966) for the State of São Paulo, Brazil. The equation used for the sites where there were no radiometric measurements available for the current study was the following: (5) where Qo is the extra-terrestrial radiation, expressed in Joule m -2 day -1 , having been determined by the expression below: (6) where 38.32 * 10 6 is the mean value of corrected solar constant converted into Joule m -2 day -1 , given by CROMMELYNK and FICHOT (1997), H is the semi-arc from the meridian crossing of the sun to the sunset time in degrees, h is the diurnal semi-arc in radians, δ is the solar declination in degrees, and is the local latitude in degrees.…”

Section: Methodsmentioning

confidence: 99%

Potato potential yield based on climatic elements and cultivar characteristics

Pereira¹,

Nova

Ramos³

et al. 2008

Bragantia

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There is currently a great deal of interest in estimating crop productivity as a function of climatic elements by means of different crop weather models. An agrometeorological model is presented based on carbon dioxide assimilation maximum rates for C 3 plants, fraction of photosynthetically active radiation, air temperature, photoperiod duration, and crop parameters under tropical climate conditions. Such crop parameters include leaf area and harvest indexes, dry matter content of potato tubers, and crop cycles to estimate potato potential yields. Field data from observed productivity obtained with the cultivar Itararé (IAC-5986), grown under adequate soil water supply conditions at four different regions in the State of São Paulo (Itararé, Piracicaba, Tatuí, and São Manuel), Brazil, were used to test the model. The results revealed an excellent performance of the agrometeorological model in study, with an underestimation of irrigated potato productivity less than 10%.Key words: modelling, Solanum tuberosum L., climatic elements, crop indexes, yield. PRODUÇÃO POTENCIAL DA BATATEIRA EM FUNÇÃO DE PARÂMETROS CLIMÁTICOS E FITOTÉCNICOS RESUMOHá um grande interesse em estudos de estimativa da produtividade de culturas agronômicas em função de elementos climáticos através do uso de diversos modelos agrometeorológicos. Neste estudo, empregou-se um modelo agrometeorológico com base em taxas máximas de assimilação de dióxido de carbono para plantas de metabolismo C 3 , radiação fotossinteticamente ativa, temperatura do ar, comprimento do dia e parâmetros fitotécnicos, como índice de área foliar, índice de colheita, conteúdo de matéria seca dos tubérculos e duração do ciclo fenológico da cultura para estimar a produtividade potencial da batateira. Dados de campo obtidos a partir de produtividades observadas com a cultivar Itararé (IAC-5986), sob condições de suprimento adequado de água no solo para quatro localidades distintas do Estado de São Paulo (Itararé, Piracicaba, Tatuí e São Manuel), Brasil, foram utilizados para testar o modelo. Os resultados revelaram um excelente desempenho do modelo climático em estudo, com subestimativas de rendimento potencial inferiores a 10%.Palavras-chave: modelagem, Solanum tuberosum L., elementos de clima, índices culturais, produção. A.B. Pereira et al.

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Section: Methodsmentioning

confidence: 99%

Potato potential yield based on climatic elements and cultivar characteristics

Pereira¹,

Nova

Ramos³

et al. 2008

Bragantia

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“…Valores dos coeficientes da equação de Angström-Prescott foram determinados em várias regiões do Brasil: Cervellini et al (1966) (Carvalho et al, 2006). O período de análise dos dados foi de 07/05/2000 (início de operação da estação automática) a 31/12/2007 (término do período de funcionamento da estação convencional).…”

Section: Introductionunclassified

Coeficientes da equação de Angström-Prescott e sua influência na evapotranspiração de referência em Seropédica, RJ

Carvalho

Silva²,

Souza³

et al. 2011

Rev. bras. eng. agríc. ambient.

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RESUMOA evapotranspiração de referência (ETo) é dependente da quantidade de energia disponível no ambiente e a radiação solar (Rs) é uma variável importante na sua estimativa. Mediante o exposto, o presente trabalho teve como objetivo determinar os coeficientes "a" e "b" da equação de Angströn-Prescott para Seropédica, RJ, e avaliar seus efeitos na estimativa da Rs e da ETo. Utilizaram-se medidas da radiação solar global e número efetivo de horas de brilho solar da estação Ecologia Agrícola ABSTRACTThe reference evapotranspiration (ETo) is dependent on the amount of energy available in the environment, being solar radiation (SR) as an important variable in its estimation. This study was carried out in order to determine the coefficients "a" and "b" of the Angstron-Prescott equation for Seropédica, Rio de Janeiro State, Brazil, and to evaluate their effects on the SR and ETo estimation. Measures of global solar radiation and effective number of hours of sunshine were used from station Ecology Fund (83741 -INMET) for the period of 2000 to 2007. The coefficients were determined by linear regression analysis for the entire period and monthly and yearly periods. Using the calculated coefficients and those proposed by FAO (0.25 and 0.50) SR and ETo were estimated and evaluated their performance. The average monthly coefficients "a" ranged from 0.232 to 0.299 and "b" from 0.397 to 0.504. Annual mean coefficients "a" and "b" were 0.295 and 0.417, and for general period were 0.282 and 0.433, respectively. The best performance observed for the estimated SR and ETo was obtained when the monthly coefficients of the equation Angströn-Prescott were adopted.

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“…The global solar radiation flux density (Qg) was estimated taking into account the mean values of a and b Angstrom's coefficients obtained by Cervellini et al (1966) …”

Section: Methodsmentioning

confidence: 99%

Potato Production as Affected by Crop Parameters and Meteoro Logical Elements

Pereira¹,

Nova

Pereira

2009

IFIP Advances in Information and Communication Technology

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Abstract:Meteorological elements directly influence crop potential productivity, regulating its transpiration, photosynthesis, and respiration processes in such a way as to control the growth and development of the plants throughout their physiological mechanisms at a given site. The interaction of the meteorological factors with crop responses is complex and has been the target of attention of many researchers from all over the world. There is currently a great deal of interest in estimating crop productivity as a function of climate by means of different crop weather models in order to help growers choose planting locations and timing to produce high yields with good tuber quality under site-specific atmospheric conditions. In this manuscript an agrometeorological model based on maximum carbon dioxide assimilation rates for C3 plants, fraction of photosynthetically active radiation, air temperature, photoperiod duration, and crop parameters is assessed as to its performance under tropical conditions. Crop parameters include leaf area and harvest indexes, dry matter content of potato tubers, and crop cycles to estimate potato potential yields.

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Estimativa da distribuição da energia solar no Estado de São Paulo

Cited by 18 publications

References 4 publications

Potato potential yield based on climatic elements and cultivar characteristics

Potato potential yield based on climatic elements and cultivar characteristics

Coeficientes da equação de Angström-Prescott e sua influência na evapotranspiração de referência em Seropédica, RJ

Potato Production as Affected by Crop Parameters and Meteoro Logical Elements

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