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| Registros recuperados: 47 | |
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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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| Moya,Róger; Solano,Marco. |
| In Costa Rica, there has been a growing interest to use pineapple fiber from plant, for which current processes need to be improved or new processes need to be developed, with emphasis on drying methods. This work presents the design and evaluation of the behavior of a prototype portable solar dryer in four sites of Costa Rica. The design describes the main parts of the dryer, as well as how they were constructed. The behavior was evaluated according to temperature and relative humidity inside e outside the chamber, and the influence of direct and indirect solar radiation. In order to achieve improved dryer efficiency, a dehumidifier was used to control relative humidity, and a heating system was implemented during the hours of low temperature, low solar... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Air drying; Relative humidity; Moisture content; Temperature; Solar radiation. |
| Ano: 2012 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1413-70542012000600009 |
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| Almeida Neto,Luiz A.; Pandorfi,Héliton; Moraes,Alex S.; Guiselini,Cristiane; C. Júnior,José J. Florentino. |
| ABSTRACT Sugarcane is considered one of the main alternatives for biofuel production and an important product of Brazilian agriculture, so it is indispensable to adopt new techniques for its cultivation and management. Thus, the present study aimed to evaluate the effect of the quality of supplemental lighting, based on light-emitting diode (LED), on the acclimation of pre-sprouted sugarcane seedlings in a protected environment. The experimental design was completely randomized, consisting of three supplemental LED lighting systems, with light proportions of 90% red + 10% blue (R:B 90/10), 80% red + 20% blue (R:B 80/20) and 70% red + 30% blue (R:B 70/30), and a control, with natural solar radiation, with 5 replicates. Multivariate principal component... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Principal components; Light-emitting diode; Supplemental lighting; Solar radiation. |
| Ano: 2019 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-69162019000400410 |
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| Dan, Hugo Almeida; FESURV; Carrijo, Murilo Sousa; Universidade de Rio Verde - FESURV; Carneiro, Daniela Fideles; Universidade de Rio Verde - FESURV; Costa, Katia Aparecida de Pinho; Universidade de Rio Verde - FESURV; Silva, Alessandro Guerra; Universidade de Rio Verde - FESURV. |
| O presente trabalho objetivou avaliar a influência do sombreamento sobre o desempenho de cultivares de sorgo granífero. O ensaio foi realizado em casa-de-vegetação, utilizando-se delineamento inteiramente casualisado, em esquema fatorial 4 x 2, correspondendo aos quatro híbridos de sorgo granífero (DKB 599, AG 1040, BRS 308 e AG 1040) submetidos a pleno sol e sombreado, com três repetições. Determinou-se a altura de planta, área foliar, matéria seca das folhas, caule, raízes e panícula, além do comprimento do pendão e da panícula. Os resultados obtidos permitiram constatar que o ambiente sombreado proporcionou maior altura de plantas de sorgo, porém menores valores de área foliar. A redução na luminosidade proporcionou ainda maior acúmulo de massa seca de... |
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Palavras-chave: Agronomia Sorghum bicolor; Radiação solar; Matéria seca; Características agronômicas 5.01.03.06-7 Sorghum bicolor; Solar radiation; Dry matter; Agronomic characteristics. |
| Ano: 2010 |
URL: http://periodicos.uem.br/ojs/index.php/ActaSciAgron/article/view/5508 |
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| Strassburger, André Samuel; Universidade Federal de Pelotas; Peil, Roberta Marins Nogueira; Universidade Federal de Pelotas; Fonseca, Leandro Andrade da; Universidade Federal de Pelotas; Aumonde, Tiago Zanatta; Universidade Federal de Pelotas; Mauch, Carlos Rogério; Universidade Federal de Pelotas. |
| O objetivo deste trabalho foi quantificar os índices de crescimento, a produção e a distribuição de matéria seca da cultura da abobrinha italiana cultivada em substrato de casca de arroz in natura com solução nutritiva recirculante, em duas épocas de cultivo: primavera-verão de 2005 e verão-outono de 2006, caracterizadas, respectivamente, como períodos de alta e baixa disponibilidades de radiação solar. Cada tratamento correspondeu a uma época de amostragem, sendo a produção de matéria seca quantificada aos 0, 18, 32, 46 e 68 dias após o transplante (DAT) no cultivo de primavera-verão, e aos 0, 15, 29, 43 e 55 DAT no cultivo de verão-outono. A produção de matéria seca foi maior quando a disponibilidade de radiação solar foi mais elevada. Nessa situação... |
| Tipo: Pesquisa de Campo |
Palavras-chave: 5.00.00.00-4; 5.01.00.00-9 Cucurbita pepo L.; Produção de matéria seca; Hidroponia; Área foliar; Radiação solar; Análise de crescimento 5.01.03.00-8 Cucurbita pepo L.; Dry matter production; Hydroponics; Leaf area; Solar radiation; Growth analysis. |
| Ano: 2011 |
URL: http://periodicos.uem.br/ojs/index.php/ActaSciAgron/article/view/5952 |
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| Enríquez-del Valle,José R; Antonio-Luis,Karla H; Rodríguez-Ortiz,Gerardo; Campos-Ángeles,Gisela V. |
| Agave potatorum Zucc adventitious shoots were obtained in vitro from stem tissues and rooted in different solid media, pH 5.8, containing the following: 1) different concentrations (50, 75, and 100%) of MS (Murashige and Skoog) mineral salts and 2) different quantities of indole-3-butyric acid (IBA) (0, 0.5, 1 mg L-1). The shoots in each medium were separated into two groups and incubated for 84 days under different environments, including a laboratory or greenhouse. The experimental design was completely randomized with a 3×3×2 factorial arrangement. Adventitious roots emerged after 10 to 14 days of incubation, depending on the condition of incubation. In both laboratory and greenhouse settings, after 28 days of incubation, 66.6 and 93.6% of shoots... |
| Tipo: Journal article |
Palavras-chave: Fluorescent lighting; Incubation environment; Indole butyric acid; Mineral salts; Solar radiation. |
| Ano: 2016 |
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-16202016000200009 |
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| Sandri,Miguel Angelo; Andriolo,Jerônimo Luiz; Witter,Marcio; Dal Ross,Tiago. |
| The experiment was conducted at Universidade Federal de Santa Maria, Rio Grande do Sul State, Brazil, to determine the effect of shading on tomato plants grown in a greenhouse. Sowing was done on July 4th and planting on August 27th, 2000, in a plant density of 3.3 plants m-2, using an organic commercial rooting medium. Water and nutrients were supplied on a daily basis using a nutrient solution. Two polyethylene tunnels (2.20 m height, 5 m width, 15 m length) were used. In the first plastic tunnel, used as control, the transmissivity of global radiation was 83% and plants were conducted as a commercial crop. In the second tunnel, plants were grown under a 52% shading screen. Plant growth and development were measured at 19; 26; 33; 40; 47; 54; 61; 75 and... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Lycopersicon esculentum; Growth efficiency; Solar radiation; Climatic suitability. |
| Ano: 2003 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0102-05362003000400013 |
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| Sartori,G.M.S.; Marchesan,E.; Azevedo,C.F.; Filho,A.C.; Roso,R.; Coelho,L.L.; Oliveira,M.L.. |
| Irrigated rice sowing season and red rice competition are among the main factors affecting grain yield. The objective of this work was to evaluate the sowing date of irrigated rice and moments of application of the herbicide imazapyr + imazapic to control red rice management and irrigated rice grain yield. Eight experiments were performed at the following dates (09/30, 10/19, 11/08 and 12/01) for the 2010/2011 harvest season and (09/27, 10/17, 11/08 and 12/05) for the 2011/2012 harvest season. The treatments were: application of the herbicide imazapyr + imazapic at doses of 105+35 g ha-1 in pre-emergence (PRE); 52.5+17.5 g ha‑1 in pre-emergence and 52.5+17.5 g ha-1 in post-emergence (PRE + POST); and 105+35 g ha-1 in post- emergence (POST), and a control... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Weed; Herbicide; Chemical control; Temperature; Solar radiation; Oryza sativa. |
| Ano: 2013 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-83582013000300015 |
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| Cordeiro Júnior,José J. F.; Cavalcanti,Sávio D. L.; Souza,Rayanne T. de A.; Batista,Pedro H. D.; Guiselini,Cristiane. |
| ABSTRACT Sugarcane has a great economic interest in Brazil, so it needs technologies to increase its yield strength, especially for seedling production. This study aimed to ascertain the influence of shading nets on early growth and development of pre-sprouted sugarcane seedlings. An experiment was conducted in a protected environment, in the Rural Federal University of Pernambuco (UFRPE), in Recife-PE, Brazil. The protected environments were covered with anti-UV low-density polyethylene plastic plus: Solpack® red ultranet net, Solpack® white net, Solpack® freshnet net, and without shade net, and five replications each. The experiment was carried out in a completely randomized design, and multivariate principal component analysis (PCA) was used to verify... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Protected environment; Shade nets; Solar radiation; Saccharum officinarum. |
| Ano: 2020 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-69162020000100010 |
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| Coan,Ruchele M.; Turco,José E. P.; Pivetta,Kathia F. L.; Costa,Madson N. da; Mateus,Caroline de M. D'A.. |
| With this study, the objective was to estimate the photosynthetically active radiation (PAR) and to correlate it with the dry matter (MMSPA) of the emerald zoysia (Zoysia japonica Steud.) on surfaces with different expositions and slopes. The research was conducted at the Experimental Watershed of the Agricultural Engineering Department, School of Agriculture and Veterinary Sciences of São Paulo State University (FCAV/UNESP), Brazil, where the surfaces (H, 10 N, 30 N, 50 N, 10 S, 30 S, 50 S, 10 L, 30 L, 50 L, 10 O, 30 O and 50 O) were used. To obtain the global solar radiation, it was installed an automated weather station where the PAR (dependent variable) was obtained by the equation y = a + bx, and the global radiation was independent. To compare means... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Zoysia japonica; Slope; Solar radiation. |
| Ano: 2012 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-69162012000300009 |
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| Álvarez,José; Mitasova,Helena; Allen,H. Lee. |
| Solar radiation is a key component in process-based models. The amount of this energy depends on the location, time of the year, and atmospheric conditions. Several equations and models have been developed for different conditions using historical data from weather station networks or satellite measurements. However, solar radiation estimates are too local since they rely on weather stations or have a resolution that is too coarse when working with satellites. In this study, we estimated monthly global solar radiation for the south-central region of Chile using the r.sun model and validated it with observations from automatic weather stations. We analyzed the performance of global radiation results with the Hargreaves-Samani (HS) and Bristow-Campbell (BC)... |
| Tipo: Journal article |
Palavras-chave: Solar radiation; R. sun model. |
| Ano: 2011 |
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-58392011000400016 |
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| LACERDA,ZILDA C. DE; TURCO,JOSÉ E. P.. |
| One approach to verify the adequacy of estimation methods of reference evapotranspiration is the comparison with the Penman-Monteith method, recommended by the United Nations of Food and Agriculture Organization - FAO, as the standard method for estimating ET0. This study aimed to compare methods for estimating ET0, Makkink (MK), Hargreaves (HG) and Solar Radiation (RS), with Penman-Monteith (PM). For this purpose, we used daily data of global solar radiation, air temperature, relative humidity and wind speed for the year 2010, obtained through the automatic meteorological station, with latitude 18° 91' 66" S, longitude 48° 25' 05" W and altitude of 869m, at the National Institute of Meteorology situated in the Campus of Federal University of Uberlandia -... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Penman-monteith; Hargreaves; Makkink; Solar radiation. |
| Ano: 2015 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-69162015000100027 |
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| Registros recuperados: 47 | |
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