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| Registros recuperados: 14 | |
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| Rojas Acosta, Miguel. |
| Si el agua no es aplicada en tiempo y forma a los cultivos agrícolas, se corre el riesgo de que éstos sufran de estrés hídrico, cuyas consecuencias pueden reflejarse en el rendimiento y calidad del fruto. Para determinar el momento de riego en el presente trabajo se propone la generación de modelos lineales, a través del manejo de un equipo detector de humedad (TDR), termómetro infrarrojo y estación meteorológica automatizada. La investigación se llevó a cabo en un invernadero del Colegio de Postgraduados, ubicado en el Campus Montecillo, Estado de México. Para analizar el estrés de la planta, se estableció un experimento con plantas de jitomate en sustratos con diferente diámetro de partículas, estas fueron: fina menor, igual a 2mm, media de 2 a 5mm y... |
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Palavras-chave: Estrés hídrico; Momento de riego; Termómetro infrarrojo; Temperatura foliar; Substrato; Water stress; Irrigation time; Infrared thermometer; Leaf temperature; Substrate; Doctorado; Hidrociencias. |
| Ano: 2009 |
URL: http://hdl.handle.net/10521/125 |
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| Rojas Acosta, Miguel. |
| Si el agua no es aplicada en tiempo y forma a los cultivos agrícolas, se corre el riesgo de que éstos sufran de estrés hídrico, cuyas consecuencias pueden reflejarse en el rendimiento y calidad del fruto. Para determinar el momento de riego en el presente trabajo se propone la generación de modelos lineales, a través del manejo de un equipo detector de humedad (TDR), termómetro infrarrojo y estación meteorológica automatizada. La investigación se llevó a cabo en un invernadero del Colegio de Postgraduados, ubicado en el Campus Montecillo, Estado de México. Para analizar el estrés de la planta, se estableció un experimento con plantas de jitomate en sustratos con diferente diámetro de partículas, estas fueron: fina menor, igual a 2mm, media de 2 a 5mm y... |
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Palavras-chave: Estrés hídrico; Momento de riego; Termómetro infrarrojo; Temperatura foliar; Substrato; Water stress; Irrigation time; Infrared thermometer; Leaf temperature; Substrate; Doctorado; Hidrociencias. |
| Ano: 2009 |
URL: http://hdl.handle.net/10521/125 |
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| Costa,Jéfferson de O.; Coelho,Rubens D.; Barros,Timóteo H. da S.; Fraga Júnior,Eusímio F.; Fernandes,André L. T.. |
| ABSTRACT The plant water potential and the leaf temperature are physiological responses of the coffee tree that can be used as indicative of the irrigation management of this crop. There is a dependence between the leaf water potential with the potential matrix of the soil solution, however, the water potential levels found for the coffee tree show divergent relationships in the literature regarding the matrix potential. The objective of this study is to verify the water potential and leaf surface temperature in the coffee tree when submitted to different irrigation levels. The study was conducted in Piracicaba, SP, Brazil, using Coffea arabica species from Red Catuaí IAC 144 variety, the drip irrigation system was adopted and the management done by... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Coffea arabica; Leaf temperature; Water potential. |
| Ano: 2018 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-69162018000500648 |
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| Schmidt,Denise; Caron,Braulio O; Schwerz,Luciano; Manfron,Paulo A; Elli,Elvis F; Schwerz,Felipe. |
| ABSTRACT We aimed to determine the response of cidró (Aloysia triphylla) submitted to different water replacement levels in summer and winter, in order to understand and relate the plant physiological performance under adverse weather conditions. The research was developed in a protected environment, in the city of Frederico Westphalen, Rio Grande do Sul State, Brazil. The experimental design was completely randomized, arranged in a 2x4x2 factorial scheme, two seasons of the year (summer and winter), four water availability (50, 75, 100, 125% of ETo) and two faces of leaf (abaxial and adaxial), with four replications. There were evaluated stomatal vapor diffusion resistance (s/cm), transpiration (µg/cm2/s) and leaf temperature (°C), on both faces of the... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Aloysia triphylla; Weather conditions; Stomatal resistance; Leaf temperature; Transpiration.. |
| Ano: 2017 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0102-05362017000200203 |
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| Martins,Amanda Posselt; Costa,Sérgio Ely Valadão Gigante de Andrade; Anghinoni,Ibanor; Kunrath,Taise Robinson; Cecagno,Diego; Reichert,José Miguel; Balerini,Fabrício; Dillenburg,Lúcia Rebello; Carvalho,Paulo César de Faccio. |
| Abstract: The objective of this work was to evaluate the impact of grazing intensities after 11 years of an integrated crop-livestock system, under no-tillage, on soil moisture and soybean physiological parameters during a summer season affected by drought. The experiment was established in 2001 on a Rhodic Hapludox. Treatments consisted in the succession of soybean (summer) and a mixed pasture of black oat + Italian ryegrass (winter), under different beef-cattle grazing intensities: intensive grazing, with 0.10-m pasture height; moderate grazing, with 0.20-m pasture height; and no grazing. During the soybean cycle, in the 2011/2012 crop season, rainfall was 40% of the climatological normal. The soil moisture was within the limits of available water both... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Glycine max; Leaf temperature; Leaf water potential; Water availability. |
| Ano: 2016 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-204X2016000800978 |
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| Guimarães,Cleber Morais; Stone,Luís Fernando; Castro,Adriano Pereira de; Morais Júnior,Odilon Peixoto de. |
| Abstract: The objective of this work was to evaluate the feasibility of using physiological parameters for water deficit tolerance, as an auxiliary method for selection of upland rice genotypes. Two experiments - with or without water deficit - were carried out in Porangatu, in the state of Goiás, Brazil; the water deficit experiment received about half of irrigation that was applied to the well-watered experiment. Four genotypes with different tolerance levels to water stress were evaluated. The UPLRI 7, B6144F-MR-6-0-0, and IR80312-6-B-3-2-B genotypes, under water stress conditions, during the day, showed lower stomatal diffusive resistance, higher leaf water potential, and lower leaf temperature than the control. These genotypes showed the highest grain... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Oryza sativa; Leaf diffusive resistance; Leaf temperature; Leaf-water potential.. |
| Ano: 2015 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-204X2015000700534 |
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| Brunini,Rodrigo G.; Turco,José E. P.. |
| ABSTRACT Sugarcane (Saccharum officinarum L.) is a crop of vital importance to Brazil, in the production of sugar and ethanol, power generation and raw materials for various purposes. Strategic information such as topography and canopy temperature can provide management technologies accessible to farmers. The objective of this study was to determine water stress indices for sugarcane in irrigated areas, with different exposures and slopes. The daily water stress index of the plants and the water potential in the soil were evaluated and the production system was analyzed. The experiment was carried out in an “Experimental Watershed”, using six surfaces, two horizontal and the other ones with 20 and 40% North and South exposure slopes. Water stress level was... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Water stress; Leaf temperature; Slope; Water and soil management. |
| Ano: 2016 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1415-43662016001000925 |
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| CAMPOSTRINI,ELIEMAR; YAMANISHI,OSVALDO KIYOSHI. |
| Four papaya genotypes, two from the Solo group (Sunrise Solo TJ and Improved Sunrise Solo line 72/12) and two from the Formosa group (Tainung 02 and Know You 01) grown in ultisol under field conditions in Macaé, RJ, Brazil, were used in this study. Two different effective depths (ED) were determined in the area using a penetrographer with average soil moisture of 11.2%. The area with ED of 0.35 m with a maximum pressure of 4.12 MPa for penetration was defined as an area with restriction (WR) to root growth, while, the area with minimum ED of 0.60 m and a pressure lower than 2.30 MPa as an area with no restriction (NR). The net CO2 assimilation rate (A), stomatal conductance (g s), leaf temperature (Tl), intercellular partial pressure of CO2 (c i) and... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Carica papaya L.; Photosynthesis; Leaf temperature; Stomatal conductance; Intrinsic water use efficiency. |
| Ano: 2001 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-31312001000200002 |
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| CAMPOSTRINI,ELIEMAR; YAMANISHI,OSVALDO KIYOSHI; MARTINEZ,CARLOS A.. |
| In this research, was used four papaya (Carica papaya L.) genotypes: three from the 'Solo ( Sunrise Solo TJ, Sunrise Solo 72/12 and Baixinho de Santa Amália) group and one from the 'Formosa' group (Know-You 01). They were grown in plastic pots containing a sandy-clay-loam soil subjected to pH correction and fertilization, under greenhouse conditions. Throughout the experimental period plants were subjected to periodic irrigation to maintain the soil humitidy around field capacity. The experiment was conducted 73 days after sowing. In all genotypes, leaf gas exchange characteristics were determined. The net photosynthetic rate (A, mumol m-2 s-1 ), stomatal conductance (g s mol m-2 s-1), leaf temperature (T I, 0C) and intercellular carbon dioxide... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Photosynthesis; Carica papaya; Stomatal conductance; Leaf temperature. |
| Ano: 2001 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-29452001000300014 |
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| DELAZARI,FÁBIO T.; ASSIS,IGOR R.; CABRERA,DIEGO F.V.; FERREIRA,MARIANE G.; DIAS,LUIZ E.; RUEDA,ANGELICA; ZANUNCIO,JOSÉ C.; SILVA,DERLY J.H.. |
| Abstract The sweet potato is an alternative energy source, but its sustainability depends on efficient water use. The objective of this study was to evaluate sweet potato morpho-physiological characteristics, and water use efficiency (WUE). Irrigation depths of 50, 75, 100, and 125% of crop evapotranspiration (ETc) were applied. The morpho-physiological indicators, WUE, leaf area index (LAI), leaf water potential, leaf temperature, and leaf chlorophyll index (ICF), were evaluated. The WUE of the sweet potato cultivars increased until the 75% water depth of the ETc. The LAI of these cultivars increased with irrigation depth, with higher values at 100% of the ETc. The leaf water potential of the two sweet potato cultivars was lowest with the lower irrigation... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Ipomoea batatas; Irrigation management; Leaf temperature; Water stress; Water use efficiency. |
| Ano: 2018 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652018000703541 |
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| Silva,Marcelo de A.; Jifon,John L.; Silva,Jorge A.G. da; Sharma,Vivek. |
| Drought is one of the major limitations to plant productivity worldwide. Identifying suitable screening tools and quantifiable traits would facilitate the crop improvement process for drought tolerance. In the present study, we evaluated the ability of four relatively physiological parameters (variable-to-maximum chlorophyll a fluorescence ratio, F v/F m; estimated leaf chlorophyll content via SPAD index; leaf temperature, LT; and, leaf relative water content, RWC) to distinguish between drought tolerant and susceptible sugarcane genotypes subjected to a 90-d drought cycle. Eight field-grown genotypes were studied. By 45 d after the onset of treatments, the F v/F m, SPAD index and RWC of drought-stressed plants had declined significantly in all genotypes... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Chlorophyll a fluorescence; Relative water content; Leaf temperature; Saccharum; Water deficit. |
| Ano: 2007 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1677-04202007000300003 |
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| Habermann,Gustavo; Machado,Silvia R.; Guimarães,Vandeir F.; Rodrigues,João D.. |
| Styrax camporum is a common shrub species from the cerrado regions of São Paulo State, Brazil. Although its leaves do not have a morphologically delimited pulvinus, the apical leaves are oriented parallel to the sun (paraheliotropic leaves), most notably around noon. Horizontal leaves at the base of shoots are oriented perpendicular to the sun's rays (diaheliotropic leaves). The ecophysiological significance of this is not fully understood. We investigated how paraheliotropism influences daily CO2 assimilation (A) and other gas exchange rates, water relations, leaf temperature (Tl), and how these relate to leaf structure as assessed by anatomical leaf descriptions. Paraheliotropic leaves had greater A and stomatal conductance (g s), which led to greater... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Brazilian savanna; Ecophysiology; Gas exchange; Leaf movements; Leaf temperature; Photosynthesis; Styracaceae. |
| Ano: 2008 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1677-04202008000100008 |
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| Registros recuperados: 14 | |
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