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| Registros recuperados: 69 | |
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| Gurski,Bruno César; Jerszurki,Daniela; Souza,Jorge Luiz Moretti de. |
| Abstract: The objective of this work was to define the best alternative methods for estimating the reference evapotranspiration (ETo) in the main climatic types (Cfa and Cfb) of the state of Paraná, Brazil. The methods tested were Budyko, Camargo, Hargreaves-Samani, Linacre, and Thornthwaite, which were compared to the ETo calculated with the Penman-Monteith ASCE (EToPM) method, between 1986 and 2015, in eight meteorological stations. The performance of the alternative methods was obtained from the coefficient of determination (R2), index “d” of agreement, index “c” of performance, and root mean square error (RMSE). The Hargreaves-Samani method has a better performance in estimating the ETo for the main climatic types in the state of Paraná. The Camargo... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Climate variability; Irrigation management; Missing climate data; Penman Monteith; Simplified models; Water balance. |
| Ano: 2018 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-204X2018000901003 |
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| SILVA, J. P. da; MEIRELES, E. J. L.; CAMARGO, M. B. P. de; PANTANO, A. P.; ROMANI, L. A. S.. |
| Este manual tem por objetivo apresentar, de forma rápida e prática, a ferramenta para cálculo o balanço hídrico pelo método de Thornthwaite e Mather (1955), otimizando seu uso e aquisição de resultados pelo público interessado, contribuindo, assim, para o planejamento e tomadas de decisão das atividades agropecuárias e de pesquisas. |
| Tipo: Documentos (INFOTECA-E) |
Palavras-chave: Evapotranspiração potencial; Excedente hídrico; Balanço hídrico; Deficiência hídrica; Evapotranspiração; Water balance; Evapotranspiration; Drought. |
| Ano: 2016 |
URL: http://www.infoteca.cnptia.embrapa.br/infoteca/handle/doc/1065245 |
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| 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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| Faria,Rogério T. de; Campeche,Fernando de S. M.; Chibana,Eduardo Y.. |
| Os lisímetros de pesagem determinam a evaporação ou evapotranspiração pelo balanço de massa de água e são considerados padrões para aferição dos demais métodos. Para a obtenção de medidas confiáveis, sua calibração deve ser realizada no local de uso. O objetivo deste trabalho foi apresentar detalhes da construção de uma bateria de dez lisímetros de pesagem, calibrá-los e testar sua capacidade de medir variações de massa de água em condições de campo. Cada lisímetro tinha dimensões de 1,4 m de largura, 1,9 m de comprimento e 1,3 m de profundidade e era colocado sobre uma balança com alavancas de redução de peso e uma célula carga, cujo sinal era registrado por um sistema de aquisição de dados. A calibração foi feita utilizando-se recipientes de massa... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Balanço hídrico; Evapotranspiração; Uso consuntivo; Water balance; Evapotranspiration; Consumptive use. |
| Ano: 2006 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1415-43662006000100035 |
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| Mariano, Daiane Cinque; Faria, Rogério Teixeira; Freitas, Paulo Sergio Lourenço de; Lena, Bruno Patias; Johann, Andre Luiz. |
| Generally, standard lysimeters include a lever-load cell scale, which has become expensive compared to new electronic equipment available for experimental purposes. Currently, lysimeters containing weighing bars with up to 4 load cells are economically feasible. This goal of this study was to present the construction and calibration of four weighing lysimeters built using two rectangular tanks, with a surface area of 1.35 m2 (1 m by 1.35 m) and a depth of 1.5 m, loaded on two weighing bars. Each bar had two high accuracy loading cells connected to a junction box and a datalogger by a coaxial cable. Calibration of each lysimeter was performed after field installation. The results showed a linear response (R2 > 0.9999) of electric signal (mV) to mass... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: 5.03.02.00-0 evapotranspiration; Water balance; Soil water engenharia de água e solo. |
| Ano: 2015 |
URL: http://periodicos.uem.br/ojs/index.php/ActaSciAgron/article/view/19368 |
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| Sanches,Arthur C.; Souza,Débora P. de; Mendonça,Fernando C.; Maffei,Rodolfo G.. |
| ABSTRACT Quantification of the drained volume is one of the difficulties involved in using weighing lysimeters. Typically, this volume is measured by accessing a moat at the base of a lysimeter. However, it is not feasible to install the moat in small devices. Thus, the aim of this study involves developing, installing, calibrating, and checking the efficiency of small weighing lysimeters with automated drainage systems to test their functionality in field conditions. Each lysimeter is composed of a round PVC water tank with a diameter of 1.22 m and a depth of 0.58 m that is placed over a metal frame with three electronic load cells with the nominal capacity of each cell corresponding to 500 kg. The drainage system is composed of a small reservoir with a... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Evapotranspiration; Water balance; Water consumption. |
| Ano: 2017 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1415-43662017000700505 |
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| Fenner,William; Dallacort,Rivanildo; Faria Junior,Cleonir A.; Freitas,Paulo S. L. de; Queiroz,Tadeu M. de; Santi,Adalberto. |
| ABSTRACT The evapotranspiration process is critical to studies on the water balance and water demand of crops and can be determined by several methods. A widely-used method, despite its high installation costs, is weighing lysimeters, which consists of a box over a balance connected to a load cell that monitors variations in the soil-water-plant-atmosphere system. The aim of this study was to develop and calibrate six weighing lysimeters (with dimensions of 1.5 x 1.5 x 1.2 m each) by high precision load cells, testing their ability to measure water mass changes in field conditions and cultivated with common bean (Phaseolus vulgaris L.), in the city of Tangará da Serra, in the state of Mato Grosso, Brazil. All lysimeters showed coefficients of determination... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Crop coefficient; Water balance; Lysimetry; Water soil engineering. |
| Ano: 2019 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1415-43662019000400297 |
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| Registros recuperados: 69 | |
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