Avaliação da nebulização e abertura de cortinas na redução da temperatura do ar em ambiente protegido.

Furlan, Raquel Aparecida

doi:10.11606/t.11.2001.tde-26072002-165831

Cited by 11 publications

(18 citation statements)

References 21 publications

(28 reference statements)

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“…The black globe temperature was measured using a globethermometer, which was installed in each barn. Data were recorded once weekly at 09.00, 13.00, and 17.00 h. Black globe humidity index (BGHI) and enthalpy were calculated according to Buffington et al (1981) and Villa Nova (1999) apud Furlan (2001) Egg production and mortality rates were evaluated daily. With regard to the study of poultry behavior, the obtained data were grouped as follows: physiological behaviors, reproductive behaviors, undesirable and agonistic behaviors, and behaviors indicative of welfare (Table 1).…”

Section: Methodsmentioning

confidence: 99%

Presence of roosters in an alternative egg production system aiming at animal welfare

Pereira¹,

Miranda

Filho³

et al. 2017

R. Bras. Zootec.

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-The objective of this study was to evaluate the effect of the presence of roosters on welfare and egg production of laying hens reared in an alternative system. Two breeding systems were established: barn 1 -laying hens reared without roosters (4500 birds); and barn 2 -laying hens reared with roosters (4500 layers and 250 roosters). In the poultry facilities, microclimate, egg production, mortality rate, and bird behavior were evaluated. Microclimate analysis showed that the birds were subjected to periods of constant heat stress, except for the morning hours. However, even under these conditions, egg production results and mortality rate were consistent with the indices recommended in the Isa Brown management guide in the barn with roosters; the indices obtained were even better and were characterized by higher egg production and lower mortality rates. In addition to productivity benefits, the presence of roosters broadened the behavioral repertoire of the birds due to the introduction of reproductive behaviors. Moreover, there was a significant decrease in the tolerance-reflex behavior, which is associated with the impossibility of displaying reproductive behaviors. This alternative egg production system proved to promote animal welfare since it provides and stimulates the display of behaviors considered important for birds.

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Section: Methodsmentioning

confidence: 99%

Presence of roosters in an alternative egg production system aiming at animal welfare

Pereira¹,

Miranda

Filho³

et al. 2017

R. Bras. Zootec.

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“…Guiselini and Sentelhas (2004) observed that the minimum RH during the daytime period was influenced by the plastic covers, because during the day the saturation water vapor pressure (es) inside the greenhouses reached values above those observed outside, which resulted in a lower RH, even with an increase of actual vapor pressure (ea) caused by the retention of water vapor by the plastic cover (Buriol et al, 2000;Furlan, 2001;Viana, 2000). The daily variation of average air temperature (°C) over the three tomato growing seasons showed very similar results, except for days from 9/19/08 to 9/23/08 in the 1 st period, in which the outside average temperatures were far below to those observed inside the greenhouses.…”

Section: Resultsmentioning

confidence: 99%

Microclimatic changes caused by different plastic coverings in greenhouses cultivated with cherry tomato in southern Brazil

Holcman

Sentelhas

Mello³

2015

Rev. bras. meteorol.

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In regions with intense solar radiation it is common the use of aluminated covers in greenhouses, with the aim of reducing the inside temperature. However, the use of these covers reduces photosynthetic active radiation (PAR) transmitted into the greenhouse. The objective of the present study was to evaluate the influence of different covers on microclimate in greenhouses cultivated with cherry tomato during three growing seasons. The environment I was covered with plastic film anti-UV and with thermo-reflective screen (40%) disposed internally. The environment II was covered with diffusive plastic film (55%). The transmitted solar radiation to the interior of covered environments was, on average, 5.5 MJ m -2 day -1 in the environment I and 8.2 MJ m -2 day -1 in environment II. The air temperature in environment II was, on average, 1°C higher than external conditions. The highest difference for the relative humidity (RH) was also observed between environment II and the outside conditions, with 10.7% for the minimum RH during the first growing period. Considering all growing periods, the diffusive plastic film provided higher solar energy availability inside the greenhouse than the plastic film with thermo-reflective screen, without causing major changes in air temperature and relative humidity, and promoting greater productivity of tomato grown under this environment for the three periods evaluated. Keywords: greenhouses; plastic covers; microclimate. RESUMO:ALTERAÇÕES MICROCLIMÁTICAS PROVOCADAS POR DIFERENTES COBERTURAS PLÁSTICAS EM AMBIENTE PROTEGIDO CULTIVADO COM TOMATE TIPOCEREJA NO SUDESTE DO BRASIL Em regiões de intensa radiação solar é comum o uso de malhas aluminizadas em cultivos protegidos, com o intuito de reduzir a temperatura no interior de estufas plásticas. Porém, o uso dessas malhas provoca diminuição da radiação fotossinteticamente ativa (RFA) transmitida ao interior do ambiente protegido. O presente estudo teve por objetivo avaliar a influência de diferentes coberturas plásticas no microclima de ambientes protegidos, ao longo de três períodos de cultivo com tomate cereja. O ambiente I foi coberto com filme plástico anti-UV e com uma malha termorefletora (40%) disposta internamente. O ambiente II foi coberto com filme plástico difusor (55%). A radiação solar transmitida ao interior dos ambientes protegidos foi, em média, de 5,5 MJ m -2 dia -1 no ambiente I e 8,2 MJ m -2 dia -1 no ambiente II. A temperatura do ar no ambiente II foi, em média, 1°C superior ao ambiente externo. As maiores diferenças para a umidade relativa do ar também foram encontradas entre o ambiente II e o externo, chegando a 10,7% para a UR mínima, no primeiro período de cultivo. Considerando-se todos os ciclos de cultivo, o plástico difusor foi o que proporcionou a maior disponibilidade de energia no interior do ambiente protegido, sem causar, no entanto, grandes alterações na temperatura e na umidade relativa do ar, e promovendo uma maior produtividade do tomate cultivado sob este ambiente, nos três períodos avaliado...

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“…Depende, portanto, dos processos de incidência da radiação solar, reflexão e re-irradiação através dos objetos no interior da estufa, convecção e condução através da cobertura e paredes, renovação do ar, evapotranspiração e troca de calor com o solo (Cermeño, 1993). A renovação de ar por meio de ventilação natural através da abertura de janelas e cortinas possibilita reduções significativas na temperatura no interior de estufas de polietileno (Furlan, 2001).…”

Section: Temperatura Do Arunclassified

“…A cobertura plástica utilizada em estufas é responsável por alteração significativa no balanço de radiação que ocorre em seu interior, em relação ao ambiente externo, devido à atenuação causada pela cobertura na radiação solar incidente, o que acaba resultando em redução no saldo de radiação interno (Furlan, 2001) e, conseqüentemente, na evapotranspiração. Assim, no interior de estufas a evapotranspiração é, geralmente, menor do que aquela que ocorre no ambiente externo, devido não somente à redução no saldo de radiação, mas também à menor ventilação e à maior umidade do ar (Pereira et al, 2002).…”

Section: Evapotranspiraçãounclassified

“…Analisando-se os dados referentes aos dias 17/04, insolação (n) igual 10 h. Resultados semelhantes aos aqui descritos também foram obtidos por Buriol et al (2000), Viana (2000) e Furlan (2001). 00:00 02:00 04:00 06:00 08:00 10:00 12:00 14:00 16:00 18:00 20:00 22:00 plástico leitoso, plástico leitoso + malha termo-refletora e plástico leitoso + malha preta, e na estação meteorológica (ambiente externo).…”

Section: Temperatura Do Arunclassified

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Microclima e produção de gérbera em ambientes protegidos com diferentes tipos de cobertura

Guiselini¹

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Avaliação da nebulização e abertura de cortinas na redução da temperatura do ar em ambiente protegido.

Abstract: Ao professor orientador Dr. Marcos Vinícius Folegatti, por ter participado durante todo o processo de elaboração e execução desse trabalho sempre com muita dedicação, incentivo e amizade.

Cited by 11 publications

References 21 publications

Presence of roosters in an alternative egg production system aiming at animal welfare

Presence of roosters in an alternative egg production system aiming at animal welfare

Microclimatic changes caused by different plastic coverings in greenhouses cultivated with cherry tomato in southern Brazil

Microclima e produção de gérbera em ambientes protegidos com diferentes tipos de cobertura

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