Heat Transfer Modelling of Screenhouses

Desmarais, G.; Ratti, Cristina; Raghavan, G.S.V.

doi:10.1016/s0038-092x(99)00002-x

Cited by 20 publications

(6 citation statements)

References 14 publications

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“…In the present study, 81.1 and 89.3% reductions in daytime and nighttime air speed, respectively, were observed inside the screenhouse. Our results were similar with the findings of Desmarais, Ratti & Raghavan (1999) who reported an 80% reduction in air speed inside a 3.2 m height screenhouse compared with that in OFC. However, Allen (1975) observed a 67% reduction in air speed in a covered soybean field as compared to an open soybean field.…”

Section: Discussionsupporting

confidence: 92%

Application of insect-proof nets in pesticide-free rice creates an altered microclimate and differential agronomic performance

Yang

Guo

et al. 2018

PeerJ

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BackgroundInsect-proof nets are commonly used in crop production and scientific research because of their environmental, economic, and agronomic benefits. However, insect-proof nets can unintentionally alter the microclimate inside the screenhouse and therefore greatly affect plant growth and yield. To examine the microclimate and agronomic performance of pesticide-free rice under insect-proof nets, two-year field experiments were carried out in 2011 and 2012.MethodsIn the present study, the experiment was conducted by using a split-plot design considering the cultivation environment (open field cultivation (OFC) and insect-proof nets cultivation (IPNC)) as the main plot and the varieties as the subplot (Suxiangjing3 and Nanjing44).ResultsIPNC significantly reduced the air speed and solar radiation, and slightly increased the daytime soil temperature, daytime air temperature, and nighttime relative humidity. By contrast, the nighttime soil temperature, nighttime air temperature, and daytime relative humidity were relatively unaffected. The grain yield of both rice cultivars decreased significantly under IPNC, which was largely attributed to the reduced panicle number. The reduced panicle number was largely associated with the decreased maximum tiller number, which was positively correlated with the tillering rate, time of tillering onset, and tillering cessation for both rice cultivars under IPNC. In addition, dry matter accumulation significantly decreased for both rice cultivars under IPNC, which was mainly caused by the decreased leaf area duration resulting from the reduced leaf area index. By contrast, the mean net assimilation rate was relatively unaffected by IPNC.DiscussionInsect-proof nets altered the microclimate in comparison with OFC by reducing the air speed and changing the radiation regime, which significantly affected dry matter production and yield of both japonica rice cultivars. Our results indicated that cultivation measures that could increase the tillering rate and the maximum tiller number under IPNC would lead to a significant increase in panicle number, ultimately increasing grain yield. In addition, maintaining a high leaf area duration by increasing the leaf area index would be important to compensate for the dry matter accumulation losses under IPNC. These findings are critical to provide a theoretical basis for improving agronomic performance of pesticide-free rice under IPNC.

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Section: Discussionsupporting

confidence: 92%

Application of insect-proof nets in pesticide-free rice creates an altered microclimate and differential agronomic performance

Yang

Guo

et al. 2018

PeerJ

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“…The general mixed linear model used for the prediction of the growing environment, genotype, and interaction factor levels on the total phenotypic response showed that the fructose and glucose contents were significantly lower in the tomatoes grown under the screenhouse (Table ). In our trials, the climatic conditions observed in the screenhouse represented a mean reduction of 26.7% of the average photosynthetically active radiation and an increase of 3.8% of the average day temperature, a common result for these kinds of protection structures . Consequently, the effect of the reduction in the sugar content caused by plant shading , had a higher influence than the increased fruit sink power leading to higher dry matter contents associated with higher temperatures .…”

Section: Results and Discusionmentioning

confidence: 81%

Evaluation of Genotype and Environment Effects on Taste and Aroma Flavor Components of Spanish Fresh Tomato Varieties

Cebolla-Cornejo

Roselló

Valcárcel

et al. 2011

J. Agric. Food Chem.

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Registro de acceso restringido Este recurso no está disponible en acceso abierto por política de la editorial. No obstante, se puede acceder al texto completo desde la Universitat Jaume I o si el usuario cuenta con suscripción. Registre d'accés restringit Aquest recurs no està disponible en accés obert per política de l'editorial. No obstant això, es pot accedir al text complet des de la Universitat Jaume I o si l'usuari compta amb subscripció. Restricted access item This item isn't open access because of publisher's policy. The full--text version is only available from Jaume I University or if the user has a running suscription to the publisher's contents.

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“…The effects of screens on crop microclimate and water use have been investigated in several studies during the past two decades (Cohen et al, 2005;Desmarais et al, 1999;Kittas et al, 2012;Pirkner et al, 2014;Tanny and Cohen, 2003;Tanny et al, 2003Tanny et al, , 2006Tanny et al, , 2010aTanny et al, ,b, 2014Teitel and Wenger, 2010;Teitel et al, 1996). Screens not only reduce air velocity near the crop but also modify turbulence characteristics (Tanny and Cohen, 2003;Siqueira et al, 2012) and thereby reduce the wind's contribution to heat and water-vapour exchange between plants and atmosphere.…”

Section: Introductionmentioning

confidence: 99%

The effect of screen type on crop micro-climate, reference evapotranspiration and yield of a screenhouse banana plantation

Pirkner

Tanny

Shapira³

et al. 2014

Scientia Horticulturae

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Heat Transfer Modelling of Screenhouses

Cited by 20 publications

References 14 publications

Application of insect-proof nets in pesticide-free rice creates an altered microclimate and differential agronomic performance

Application of insect-proof nets in pesticide-free rice creates an altered microclimate and differential agronomic performance

Evaluation of Genotype and Environment Effects on Taste and Aroma Flavor Components of Spanish Fresh Tomato Varieties

The effect of screen type on crop micro-climate, reference evapotranspiration and yield of a screenhouse banana plantation

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