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| Angelocci,Luiz Roberto; Marin,Fábio Ricardo; Oliveira,Ricardo Ferraz de; Righi,Evandro Zanini. |
| Leaf vapor diffusive conductance (gl) and transpiration (T) measurements in an irrigated orchard of the acid lime "Tahiti" were carried out in a subtropical climatic condition in the State of São Paulo, Brazil. Measurements were made using steady-state null-balance porometers and were taken throughout the day, on several occasions from February to November, 1998. During September and October, measurements were performed on exposed and shaded young and fully expanded leaves, as well as on old leaves inside the tree canopy. The old leaves showed lower values of gl and T when compared to the other groups. In the other months, measurements were taken only with exposed and shaded fully expanded leaves. The highest values of gl and T were obtained from February... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Air temperature; Photosynthetic photon flux density; Porometry; Stomata; Vapor pressure deficit. |
| Ano: 2004 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1677-04202004000100008 |
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| Bortoluzzi,Mateus Possebon; Heldwein,Arno Bernardo; Trentin,Roberto; Lucas,Dionéia Daiane Pitol; Righi,Evandro Zanini; Leonardi,Mateus. |
| ABSTRACT: The aim of this study was to identify soybean sowing dates on which there was low water surplus risk. The crop was raised on a Haplic Planosol soil in the Central Depression of Rio Grande do Sul, Brazil. Soybean development simulations and daily water balances were calculated for different sowing dates from August 1968 to July 2012. Water surplus data was subjected to BoxPlot analyses and Scott-Knott tests at a 5% error probability. Exponential, gamma, lognormal, normal and Weibull functions were tested and the best fits to the data were obtained for both subperiods and total cycle. The highest number of fits for the development cycle and subperiods were obtained using the gamma and weibull functions, respectively. For sowing carried out after... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Glycine max; Water balance; Numerical analysis; Probability distribution function. |
| Ano: 2017 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-84782017000200205 |
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| Pilau,Felipe Gustavo; Battisti,Rafael; Somavilla,Lucindo; Righi,Evandro Zanini. |
| A estimativa da evapotranspiração de referência (ETo), usada no balanço hídrico, possibilita quantificar o armazenamento de água no solo, auxiliando no manejo da irrigação. O objetivo do trabalho foi comparar métodos mais simples de estimativa da evapotranspiração de referência com o método Penman-Monteith (FAO), nas escalas diária e de 5, 10, 15 e 30 dias, e mensal, para os municípios de Frederico Westphalen e Palmeira das Missões, no RS. Os métodos avaliados tenderam a melhorar a eficiência com o aumento da escala temporal de estudo, mantendo o mesmo desempenho para ambas as localidades. Os maiores e menores valores de ETo ocorreram nos meses de dezembro e junho, respectivamente. A maioria dos métodos subestimou os valores de ETo. Em qualquer escala... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Elementos climáticos; Métodos empíricos; Evapotranspiração. |
| Ano: 2012 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-84782012000200016 |
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| Righi,Evandro Zanini; Heldwein,Arno Bernardo; Maldaner,Ivan Carlos; Lucas,Dionéia Daiane Pittol; Stüker,Paulo Ervin. |
| New coefficients were determined for the weighting term for cloudiness in the Brunt-Penman equation using the rate of solar radiation (RK) in place of the rate of sunshine duration (n/N). The coefficients in the Brutsaert method proposed for daytime in southern Brazil were also tested and adjusted, and the method was selected which gave the more accurate daily results in relation to the original Brunt-Penman equation, for Santa Maria in the state of Rio Grande do Sul, Brazil (RS). Meteorological data covering 2,472 days obtained from the automatic and conventional weather stations in Santa Maria were used. The coefficients were adjusted by linear and nonlinear regression methods depending on the model, using 2/3 of the data. The adjusted equations were... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Solar radiation; Atmospheric transmissivity; Brunt-Penman equation; Emissivity of the atmosphere. |
| Ano: 2015 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1806-66902015000100029 |
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