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| Registros recuperados: 83 | |
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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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| Martin, Thomas Newton; Universidade Federal de Santa Maria; Dourado Neto, Durval; Escola Superior de Agricultura “Luiz de Queiroz”, Universidade de São Paulo; Vieira Junior, Pedro Abel; Empresa Brasileira de Pesquisa Agropecuária; Pereira, Antonio Roberto; Escola Superior de Agricultura “Luiz de Queiroz”, Universidade de São Paulo; Manfron, Paulo Augusto; Universidade Federal de Santa Maria, Departamento de Fitotecnia; Christoffoleti, Pedro Jacob; Escola Superior de Agricultura “Luiz de Queiroz”, Universidade de São Paulo. |
| Despite the great importance of soybeans in Brazil, there have been few applications of soybean crop modeling on Brazilian conditions. Thus, the objective of this study was to use modified crop models to estimate the depleted and potential soybean crop yield in Brazil. The climatic variable data used in the modified simulation of the soybean crop models were temperature, insolation and rainfall. The data set was taken from 33 counties (28 Sao Paulo state counties, and 5 counties from other states that neighbor São Paulo). Among the models, modifications in the estimation of the leaf area of the soybean crop, which includes corrections for the temperature, shading, senescence, CO2, and biomass partition were proposed; also, the methods of input for the... |
| Tipo: Pesquisa, modelagem |
Palavras-chave: 5.01.00.00-9 leaf area index; Water balance; Crop model; Glycine max 5.01.03.00-8. |
| Ano: 2012 |
URL: http://periodicos.uem.br/ojs/index.php/ActaSciAgron/article/view/15274 |
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| Pezzopane,José Ricardo Macedo; Bosi,Cristiam; Nicodemo,Maria Luiza Franceschi; Santos,Patrícia Menezes; Cruz,Pedro Gomes da; Parmejiani,Renan Suaiden. |
| In this study, the microclimate changes in silvopastoral systems are quantified at different time and spatial scales and compared with single-pasture systems. The study was conducted in a silvopastoral system in São Carlos, Brazil (22°01' South and 47°53' West). The silvopastoral system consisted of grass pastures [Urochloa (sin. Brachiaria) decumbens cv. Basilik] lined with strips of native trees spaced at 17 m. Continuous microclimate measurements (air temperature, relative humidity, wind speed, and incident photosynthetically active radiation) were carried out from September 2010 to September 2012 at two positions of the silvopastoral system (2.0 and 8.5 m from the rows of trees) and at a pasture under full sunlight, located in an adjacent area. The... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Solar radiation; Air temperature; Cattle; Water balance; Urochloa decumbens. |
| Ano: 2015 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0006-87052015000100110 |
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| Vestena,Leandro Redin; Kobiyama,Masato. |
| With the objective to analyze the hydrological processes and the water balance, a simplified water balance method and the modified Penman formula were applied to the Ribeirão da Onça river catchment in Colombo city, Paraná State. For the analysis, the data obtained during the monitoring period from 1997 to 2000 were utilized. The results showed that the values of the real evapotranspiration estimated by the method of the simplified water balance were negative for the certain periods and for other period sometimes more than those of the potential evapotranspiration estimated by the modified Penman formula. It implied the existence of significant groundwater recharge from other catchments to the study area, and indicates that the simplified water balance... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Water balance; Evapotranspiration; Karst. |
| Ano: 2007 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-89132007000500020 |
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| Aparecido,Lucas Eduardo de Oliveira; Rolim,Glauco de Souza; Richetti,Jonathan; Souza,Paulo Sergio de; Johann,Jerry Adriani. |
| ABSTRACT Climate is the set of average atmospheric conditions that characterizes a region. It directly influences the majority of human activities, especially agriculture. Climate classification systems (CCSs) are important tools in the study of agriculture, enabling knowledge of the climatic characteristics of a region. Thus, we aimed to perform the climatic characterization of the State of Paraná using the methods proposed by Köppen and Geiger (1928), modified by Trewartha (1954) (KT), Thornthwaite (1948) (TH) and Camargo (1991) and modified by Maluf (2000) (CM), using data from the European Center for Medium-Range Weather Forecast (ECMWF) model. The results of spatial interpolation (virtual stations) were performed using the Kriging method in spherical... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Water balance; Agriculture; Climatic characterization; ECMWF. |
| Ano: 2016 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1413-70542016000400405 |
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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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| Dalla Marta, Anna; DIPSA-University of Firenze; anna.dallamarta@unifi.it; Natali, Francesca; DIPSA-University of Firenze;; Mancini, Marco; DIPSA-University of Firenze;; Ferrise, Roberto; DIPSA-University of Firenze;; Bindi, Marco; DIPSA-University of Firenze;; Orlandini, Simone; DIPSA-University of Firenze;. |
| The contribution of agrobiomasses, as a source of energy, to the reduction of greenhouse gas emissions was confirmed by several studies. Biomass from agriculture represents one of the larger and more diverse sources to exploit and in particular ethanol and diesel have the potential to be a sustainable replacement for fossil fuels, mainly for transport purposes. However, the cultivation of energy crops dedicated to the production of biofuels presents some potential problems, e.g., competitiveness with food crops, water needs, use of fertilizers, etc., and the economic, energy, and environmental convenience of such activity depends on accurate evaluations about the global efficiency of the production system. In this study, the processes related to the... |
| Tipo: Peer-Reviewed Insight |
Palavras-chave: Agroenergy; Bioethanol; Energy balance; Pure vegetable oil; Water balance. |
| Ano: 2011 |
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| Leão,Raimundo A. de O.; Soares,Antônio A.; Teixeira,Adunias dos S.; Silva,Demetrius D. Da. |
| The state of Ceará, Brazil, has 75% of its area covered by Brazilian semiarid, with its peculiar features. In this state, the dams are constituted in water structure of strategic importance, ensuring, both in time and space, the development and supply of water to population. However, construction of reservoirs results in various impacts that should be carefully observed when deciding on their implementation. One of the impacts identified as negative is the increased evaporation, which constitutes a major component of water balance in reservoirs, especially in arid regions. Several methods for estimating evaporation have been proposed over time, many of them deriving from the Penman equation. This study evaluated six different methods for estimating... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Dams; Semiarid; Hydrologycal modelling; Water balance. |
| Ano: 2013 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-69162013000100014 |
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| Andrade,Irineu P. de S.; Carvalho,Daniel F. de; Almeida,Wilk S. de; Silva,Jonathas B. Gonçalves; Silva,Leonardo D. B. da. |
| This work aimed to study the effect of drip irrigation management on growth and yield of the 'Roxo de Valinhos' fig tree (Ficus carica L.), at three years old, and to determine crop coefficients (Kc) and its water requirement (ETc) under Baixada Fluminense climate and soil conditions, state of Rio de Janeiro, Brazil. The study was carried out in the experimental area of SIPA (Sistema Integrado de Produção Agroecológica) in Seropédica, Rio de Janeiro State, from July 2011 to May 2012. The experimental area was divided in two blocks, named B1 (sandy clay loam texture) and B2 (loamy sand texture). In each block, irrigation frequencies (IF) of two (T1) and four days (T2) were evaluated, as well as the irrigation absence (T3). Irrigation management and water... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Crop coefficient; Ficus carica L.; TDR; Irrigation frequency; Water balance. |
| Ano: 2014 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-69162014000100003 |
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| Flumignan,Danilton L.; Faria,Rogério T. de; Lena,Bruno P.. |
| Quantifying soil evaporation is required on studies of soil water balance and applications aiming to improve water use efficiency by crops. The performance of a microlysimeter (ML) to measure soil evaporation under irrigation and non-irrigation was evaluated. The MLs were constructed using PVC tubes, with dimensions of 100 mm inner diameter, 150 mm depth and 2.5 mm wall thickness. Four MLs were uniformly distributed on the soil surface of two weighing lysimeters conducted under bare soil, previously installed at Iapar, in Londrina, PR, Brazil. The lysimeters had 1.4 m width, 1.9 m length and 1.3 m depth and were conducted with and without irrigation. Evaporation measurements by MLs (E ML) were compared with measurements by lysimeters (E L) during four... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Water management; Water balance; Lysimeters; Soil water. |
| Ano: 2012 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-69162012000100009 |
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| Registros recuperados: 83 | |
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