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| Registros recuperados: 36 | |
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| Alves,Walison B.; Rolim,Glauco de S.; Aparecido,Lucas E. de O.. |
| ABSTRACT: Evapotranspiration (ET) is the main component of water balance in agricultural systems and the most active variable of the hydrological cycle. In the literature, few studies have used the forecast the day before via Artificial Neural Networks (ANNs) for the northern region of São Paulo state, Brazil. Therefore, this aimed to predict the reference evapotranspiration for Jaboticabal, the major sugarcane-producing region of São Paulo state. We used a historical series of data on average air temperature, wind speed, net radiation, soil heat flux, and daily relative humidity from 2002 to 2012, for Jaboticabal, SP (Brazil). ET was estimated by Penman-Monteith method. To forecast reference evapotranspiration, we used a feed-forward Multi-Layer... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Modeling; Multi-Layer Perceptron; Air temperature; Estimate. |
| Ano: 2017 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-69162017000601116 |
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| Zheng,Ming; Bai,Yungang; Zhang,Jianghui; Liu,Hongbo; Ding,Ping. |
| ABSTRACT In grape, high temperatures and low humidity prolong midday depression of foliar photosynthesis and dramatically reduce fruit yield. In this study, we explored the effects of various mist micro-spray treatments on grape photosynthesis at a test site in Shanshan County (N, 42.91°; E, 90.30°), Turpan, Xinjiang, China. We tested four different mist micro-spray durations including 1 h (WP1), 2 h (WP2), 3 h (WP3), and 0 h (CK). WP1, WP2, and WP3 affected canopy air temperature and humidity for 5 h, 7 h, and 9 h, respectively. At 12:30, WP1, WP2, and WP3 had the strongest cooling effect and altered temperature by −5.12 °C, −5.09 °C, and −5.17 °C respectively. The relative chlorophyll content was higher in the upper than the lower canopy leaves. There... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Air temperature; Chlorophyll; Photosynthesis; Stomatal conductance; Transpiration rate. |
| Ano: 2021 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-69162021000100039 |
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| TEODORO,IÊDO; DANTAS NETO,JOSÉ; HOLANDA,LUCAS A. DE; SAMPAIO NETO,GIVALDO D.; SOUZA,JOSÉ L. DE; BARBOSA,GERALDO V. DE S.; LYRA,GUILHERME B.. |
| The objective of this study was to evaluate the meteorological variables, water deficiency, growth, and agro-industrial yield of sugarcane varieties: RB72454, RB863129, RB867515, RB92579, RB93509, RB931003, RB951541, and RB971755, in rainfed crop in two harvests in the Rio Largo-AL region. The meteorological variables were obtained in an automatic station and water balance was done by Thornthwaite & Mather method. During the study period, the air temperature ranged from 16.6 to 35.9 ºC. In the first production cycle rained 1,806 mm and the crop evapotranspiration was 1,775 mm. In the second cycle, the rainfall totaled 1,632 mm and the crop evapotranspiration was 1,290 mm. The average water excess of two production cycles was 689 mm and the water... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Air temperature; Rain; Evapotranspiration; Canopy height. |
| Ano: 2015 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-69162015000100076 |
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| Naranjo, C.. |
| En la VII Expedición Antártida efectuado por el buque BAE "ORION", se realizó el estudio del comportamiento del Alta semicomponente del Pacífico Sur durante el verano austral y su relación con el evento ENSO. Este sistema se desplazó primeramente hacia el sur, el centro de acción presentó anomalías positivas de alrededor de 3 hPa con respecto a sus valores normales, permitiendo activación adelantada de la zona de convergencia intertropical por debilitamiento de los vientos alisios. El centro, presentó dos características principales las mismas que determinaron variaciones climáticas en latitudes medias y altas; cuando el centro se ubicó en sentido meridional sobre los 40° S permitió el debilitamiento de los ejes de cuña y los sistemas frontales circularon... |
| Tipo: Journal Contribution |
Palavras-chave: High pressure systems; Convergence zones; El Nino phenomena; Air temperature; Research vessels; Research vessels; Air temperature. |
| Ano: 1998 |
URL: http://hdl.handle.net/1834/3837 |
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| Zambrano Q., E.; Allauca, S.; Arcos, F.. |
| En el verano austral de 1990, durante la II Expedición Ecuatoriana a la Antártica a bordo del B/I ORION se efectuaron dos secciones (ida y retorno) en el Paso Drake, en las cuales se realizaron un total de 28 lances de XBT y el muestreo horario de parámetros superficiales como temperatura del mar, del aire, salinidad, vientos y clorofila "a". Los resultados obtenidos en ambas secciones permiten observar la variación de estos parámetros, en el transcurso aproximado de un mes, en el Paso Drake durante aquella época. Claramente, en las secciones verticales de temperatura, se observa la presencia de los Frentes Polar y Subantártico, dando lugar a una marcada convergencia Antártica. En el transcurso de casi un mes entre las dos secciones, se puede observar el... |
| Tipo: Journal Contribution |
Palavras-chave: Surface temperature; Air temperature; Salinity; Winds; Chlorophylls; Winds; Air temperature; Salinity; Chlorophylls; Http://aims.fao.org/aos/agrovoc/c_8401; Http://aims.fao.org/aos/agrovoc/c_230; Http://aims.fao.org/aos/agrovoc/c_6751; Http://aims.fao.org/aos/agrovoc/c_1577. |
| Ano: 1990 |
URL: http://hdl.handle.net/1834/3729 |
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| Martínez, R.. |
| Usando series de tiempo de promedios diarios de presión atmosférica, temperatura ambiental, temperatura superficial y nivel medio del mar en los años 1994-1995 en cinco estaciones costeras de Ecuador y Colombia y una estación en las Islas galápagos (Ecuador) se aplicaron las técnicas del análisis espectral para determinar las oscilaciones existentes en el océano y la atmósfera. Se obtuvieron con alto niveles de coherencia, cinco modos predominantes en la atmósfera tropical: la oscilación de 37 días, muy próxima a la oscilación de Madden-Julian (1972), un modo de tres semanas con características de la " autooscilación" de 21 días, Murakami, 1974 y que es de naturaleza planetaria, una tercera oscilación de 17 días, de características muy similares a la onda... |
| Tipo: Journal Contribution |
Palavras-chave: Barotropic motion; Water waves; Spectral analysis; Time series; Oceanographic data; Fixed stations; Water temperature data; Air temperature; Atmospheric pressure; Mean sea level; Atmospheric pressure; Spectral analysis; Air temperature; Http://aims.fao.org/aos/agrovoc/c_693; Http://aims.fao.org/aos/agrovoc/c_28964; Http://aims.fao.org/aos/agrovoc/c_230. |
| Ano: 1998 |
URL: http://hdl.handle.net/1834/2199 |
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| Angelotti,Francislene; Hamada,Emília; Magalhães,Edineide Elisa; Ghini,Raquel; Garrido,Lucas da Ressureição; Pedro Júnior,Mário José. |
| Abstract: The objective of this work was to evaluate the potential impact of climate change on the occurrence of grapevine downy mildew in Brazil. Seedlings containing four to six leaves were sprayed with a sporangia suspension containing 105 sporangia per milliliter. After spraying, the seedlings were subjected to temperatures of 26, 28, 29.1, 30.4, and 31.8°C for 24 hours. The percentage of diseased leaf area and the latent period were evaluated. Maps of the geographic and temporal distribution of the disease were made considering the monthly average of the mean air temperature and leaf wetness duration for the reference climate or climate normal (1961-1990) and the future climates (2011-2040, 2041-2070, and 2071-2100), considering the A2 and B1 gas... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Plasmopara viticola; Vitis; Air temperature; Geographical information system.. |
| Ano: 2017 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-204X2017000600426 |
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| Freitas,Cleverson Henrique de; Martins,Fabrina Bolzan; Abreu,Marcel Carvalho. |
| Abstract: The objective of this work was to estimate cardinal temperatures and phyllochron for the leaf development of the eucalyptus species Corymbia citriodora and Eucalyptus urophylla, in the seedling phase. A field experiment was carried out in a completely randomized design, in a 2x11 factorial arrangement, with the two eucalyptus species, 11 sowing dates, and five replicates, in the municipality of Itajubá, in the state of Minas Gerais, Brazil. The cardinal temperatures - base, optimum, and maximum - for leaf development were, respectively, 8.7, 17.1, and 41.3°C, for C. citriodora, and 11.5, 17.1, and 40.5°C for E. urophylla. The phyllochron of C. citriodora was 62.95°C day per leaf, and that of E. urophylla was 46.03°C day per leaf, which indicates... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Air temperature; Leaf emission rate; Phyllochron; Seedling quality; Thermal requirement. |
| Ano: 2017 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-204X2017000500283 |
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| Ferreira,Mábele de Cássia; Martins,Fabrina Bolzan; Florêncio,Gabriel Wilson Lorena; Silva,João Pedro Guimarães Cândido; Pasin,Liliana Auxiliadora Avelar Pereira. |
| Abstract: The objective of this work was to estimate the cardinal temperatures and to quantify the thermal requirements for the initial development of seedlings of the native tree species Citharexylum myrianthum and Bixa orellana. A field experiment was carried out in a completely randomized design, in a 2?12 factorial arrangement (2 tree species and 12 sowing dates), with five replicates. The base, optimum, and maximum temperatures for the development of C. myrianthum were 11.4, 18.1, and 36.6°C, and, for B. orellana, 12.0, 18.4, and 46.4°C. The thermal requirements for the development of C. myrianthum was 66.7°C day per leaf, and, for B. orellana, 82.5°C day per leaf. In the initial development, B. orellana shows a large thermal amplitude and is tolerant... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Bixa orellana; Citharexylum myrianthum; Air temperature; Leaf appearance; Phenology. |
| Ano: 2019 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-204X2019000100903 |
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| Ferraz,Patrícia Ferreira Ponciano; Yanagi Junior,Tadayuki; Lima,Renato Ribeiro de; Ferraz,Gabriel Araújo e Silva; Xin,Hongwei. |
| Abstract: The objective of this work was to evaluate the effect of thermal challenge at different intensities and durations on the production responses of 3 to 21-day-old broiler chickens. Two hundred and ten Cobb chicks were subjected to dry-bulb temperatures (tdb) of 27, 30, 33, or 36°C for the duration of 0, 1, 2, 3, or 4 days from the second day of life onwards. The experiment was carried out in four identical environmentally-controlled wind tunnels. Data on body mass (BM), feed intake (FI), and water intake (WI), all in grams, were monitored daily; and body weight gain (BWG), in grams, and feed conversion (FC) were also calculated. The effect of duration was not statistically significant. Empirical models were adjusted to relate BM, FI, and WI with... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Air temperature; Broiler; Carry-over effect; Production responses; Thermal stress.. |
| Ano: 2017 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-204X2017000200113 |
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| Registros recuperados: 36 | |
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