Microclimate under different shading screens in greenhouses cultivated with bromeliads

Holcman, Ester; Sentelhas, Paulo César

doi:10.1590/s1415-43662012000800007

Cited by 21 publications

(16 citation statements)

References 14 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…Regarding to the LLL, opposite to the results obtained in this work, usually, the red light is the one which promotes the higher results for the length of the leaves in several species (Holcman & Sentelhas 2012).…”

Section: Luminous Quality In Cultivars In Vitro Growthcontrasting

confidence: 99%

Light Quality in Vitro Growth and Acclimatization of Two Varieties of Phalaenopsis Amabilis Alba Blume (Orchidaceae)

et al. 2019

View full text Add to dashboard Cite

This study aimed to analyze the in vitro growth and acclimatization of two cultivars (cv. 6323 and cv. 6546) of the species under different light quality regimes. To evaluate the influence of light quality on the growth of seedlings of the two cultivars, plants were submitted to five different light treatments: white, blue, yellow, green and red obtained by wrapping vials with colored cellophane sheets. After 60 days of cultivation, the multivariate statistical evaluation of the results was performed. From the biometric data analysis, it could be seen that the in vitro and ex vitro growth of P. amabilis were influenced by different light qualities and the resulting variation occurs due to the influence of the genotype. The blue spectrum exerted a greater influence on the cv. 6323 and the green spectrum on the cv. 6546.

show abstract

Section: Luminous Quality In Cultivars In Vitro Growthcontrasting

confidence: 99%

Light Quality in Vitro Growth and Acclimatization of Two Varieties of Phalaenopsis Amabilis Alba Blume (Orchidaceae)

et al. 2019

View full text Add to dashboard Cite

show abstract

“…Os dados da Tabela 1 mostram que a tela termorrefletora promoveu redução de aproximadamente 37 % da Qsd e Qs e de 45 % da RFAd e RFA quando comparados ao ambiente sem tela termorrefletora. HOLCMAN & SENTELHAS (2012) observaram redução de 76 % da Qs e 80 % da RFA em ambiente coberto com PEBD e tela termorrefletora (70 % de sombreamento), comparado a ambiente coberto somente por PEBD, enquanto SCARANARI et al (2008) registraram reduções de 50 e 53 % na RFA em ambientes cobertos por PEBD com telas de sombreamento (50%), nas cores preta e vermelha, em relação a ambiente coberto somente por PEBD. A atenuação da Qs e da RFA registrada pelos autores foi superior ao nível de sombreamento das telas empregadas, ao passo que, no presente trabalho, essa atenuação foi inferior ao nível de sombreamento da tela termorrefletora empregada, diferença de efeito que pode ser parcialmente atribuída ao fato de que os autores citados fizeram uso fixo das telas, enquanto neste trabalho foi feito o manejo de abertura e fechamento, reduzindo seu efeito redutor da radiação que atinge o dossel das plantas.…”

Section: Global Radiation Inside Greenhouses During a Clear Sky Day -unclassified

“…No entanto, destaca-se que as características estruturais dos ambientes protegidos nas condições experimentais dos ensaios restringiram a taxa de troca gasosa, ocasionando aumento significativo da temperatura em relação ao ambiente externo, maior que os valores encontrados por outros autores (HOLCMAN & SENTELHAS, 2012;COSTA & LEAL, 2008).…”

Section: Global Radiation Inside Greenhouses During a Clear Sky Day -unclassified

Uso de tela termorrefletora em ambientes protegidos para cultivo do tomateiro

Ferrari

Leal

2015

Eng. Agríc.

View full text Add to dashboard Cite

RESUMO: O emprego de telas termorrefletoras, como forma de limitar o aumento da temperatura do ar em ambientes protegidos, deve ser manejado, a fim de evitar a redução excessiva da radiação solar, dada sua importância sobre o desenvolvimento e a produção de hortaliças como o tomateiro. Nesse contexto, os objetivos do trabalho foram comparar os microclimas entre ambientes protegidos cultivados com tomateiro, sendo um coberto somente com polietileno de baixa densidade (PEBD) reforçado e outro coberto com PEBD reforçado associado a uma tela termorrefletora aluminizada retrátil, sob condições de manejo, e avaliar sua adequação às condições climáticas recomendadas à cultura do tomateiro pela bibliografia consultada. O experimento foi conduzido no município de Rio das Pedras-SP, entre 1º-08-11 e 21-01-12. A tela termorrefletora foi empregada somente em dias de céu límpido, entre as 11h e as 16h. Foram coletados dados de temperatura e umidade relativa do ar, radiação solar global (Qs) e radiação fotossinteticamente ativa (RFA) no interior de ambos os ambientes protegidos, e dados de temperatura do ar no ambiente externo. O emprego da tela termorrefletora aluminizada reduziu significativamente os valores médios de Qs, RFA e a temperatura do ar, ao passo que elevou os valores de umidade relativa do ar. O microclima do ambiente com tela adaptou-se melhor às condições climáticas consideradas adequadas pela bibliografia para o cultivo do tomateiro.PALAVRAS-CHAVE: tela termorrefletora; manejo; tomateiro. USE OF THERMOREFLECTIVE SCREENS ON GREENHOUSES FOR TOMATO PRODUCTIONABSTRACT: The use of thermoreflective screens in order to limit air temperature rising in greenhouses must be based on appropriate management to avoid excessive reduction of solar radiation, due to its importance for horticultural crops development and production such as tomato. Hence, this study aims to compare the microclimates of two greenhouses cultivated with tomato and evaluate their suitability to climatic recommendations for tomato crop provided by the consulted bibliography. For this purpose two different structures were assessed: a greenhouse covered only with reinforced low-density polyethylene (LDPE) and a greenhouse covered with reinforced LDPE and retractable thermoreflective screen under management conditions. The experiment was carried out in Rio das Pedras-SP during 08/01/11 to 01/21/12. The thermoreflective screen was used only on sunny days, between 11:00 and 16:00. Air temperature and relative humidity, global radiation and photosynthetically active radiation inside both greenhouses and air temperature of external environment data were collected. The thermoreflective screen significantly reduced the mean values of global solar radiation, photosynthetically active radiation and air temperature, while increased air relative humidity. The microclimate of the greenhouse with thermoreflective screen is best suited to the climatic conditions considered appropriated by the bibliography recommendations for tomato cultivation.

show abstract

“…Whitening is a low-cost method to reduce heat build-up and modify the greenhouse environment in hot summers [32,41]. This shading method is performed by mixing a certain amount of calcium oxide or calcium carbonate with water, to make a solution which is used to paint the outer surface of the glass or polyethylene [19,42,43]. Most farmers in Almería (99%) whiten the roof of their greenhouses to increase the reflection coefficient of solar radiation, which reduces the energy input that warms the greenhouse in the peak hours of the day [19].…”

Section: Introductionmentioning

confidence: 99%

Effects of Cover Whitening Concentrations on the Microclimate and on the Development and Yield of Tomato (Lycopersicon esculentum Mill.) Inside Mediterranean Greenhouses

et al. 2020

View full text Add to dashboard Cite

This work analyzes the influence of whitening a greenhouse roof on the microclimate and yield of a tomato crop. In the west sectors of two multi-span greenhouses, a whitening concentration of 0.250 kg L−1 was used as a control. In an autumn–winter cycle, a lower (0.125 kg L−1) and an increased (0.500 kg L−1) concentration were used in the east sectors of greenhouses 1 and 2. In a spring–summer cycle, the whitening concentrations in the east were varied depending on outside temperature. The effect of whitening on photosynthetic activity, production, plants’ morphological parameters, and the quality of the fruits were also analyzed. To evaluate the effect on microclimate, solar and photosynthetically active (PAR) radiations, air and soil temperatures, and heat flux in the soil were measured in greenhouse 1. Results show that excessive whitening leads to reductions of inside PAR radiation that decreases photosynthesis and crop yield. A whitening concentration of 0.500 kg L−1 is proposed at the beginning of the autumn–winter crop cycle, washing the cover when inside temperature drops to 35 °C. At the end of the spring–summer cycle, a concentration of 0.125 kg L−1 is recommended when inside temperature increases to 35 °C.

show abstract

Microclimate under different shading screens in greenhouses cultivated with bromeliads

Cited by 21 publications

References 14 publications

Light Quality in Vitro Growth and Acclimatization of Two Varieties of Phalaenopsis Amabilis Alba Blume (Orchidaceae)

Light Quality in Vitro Growth and Acclimatization of Two Varieties of Phalaenopsis Amabilis Alba Blume (Orchidaceae)

Uso de tela termorrefletora em ambientes protegidos para cultivo do tomateiro

Effects of Cover Whitening Concentrations on the Microclimate and on the Development and Yield of Tomato (Lycopersicon esculentum Mill.) Inside Mediterranean Greenhouses

Contact Info

Product

Resources

About