Climatic effects of two cooling systems in greenhouses in the Mediterranean area: External mobile shading and fog system

García, María Concepción; Medrano, E.; Sánchez-Guerrero, M.C.; Lorenzo, Pilar

doi:10.1016/j.biosystemseng.2010.11.006

Cited by 59 publications

(23 citation statements)

References 28 publications

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“…Many studies have already shown that reducing transpiration by altering the microclimate inside the greenhouse improves the physiological adaptation of plants to stress conditions such as unfavourable external climatic conditions (G azquez et al, 2010). Recent works have focused on the effect of fogging systems on crop growth and quality in pepper (G azquez et al, 2010), tomato (Leonardi, Guichards, & Bertini, 2000;García, Medrano, S anchez-Guerrero, & Lorenzo, 2011), green bean (Romero-G amez et al, 2012), rose (Katsoulas, Baille, & Kittas, 2001) and aubergine (Katsoulas et al, 2001). Leonardi et al, 2000 postulated that the reducing air vapour pressure deficit (VPD) by fogging system increases the fresh mass of tomatoes by greater water accumulation.…”

Section: Introductionmentioning

confidence: 98%

Cooling systems in screenhouses: Effect on microclimate, productivity and plant response in a tomato crop

Leyva

Constán-Aguilar

Sánchez-Rodríguez

et al. 2015

Biosystems Engineering

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Section: Introductionmentioning

confidence: 98%

Cooling systems in screenhouses: Effect on microclimate, productivity and plant response in a tomato crop

Leyva

Constán-Aguilar

Sánchez-Rodríguez

et al. 2015

Biosystems Engineering

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“…In [10] whitening reduced S i by 22% and T ai by 0.8 • C, and in [15] whitening reduced S i by 30% and T ai by 4 • C. Unlike the whitening effects, the reduction in the transmitted solar radiation and the inside air temperature due to nets or screen shading depends on the type and color of nets, in addition to other meteorological factors. For example, deploying various types of nets, and having different colors and shading factors over naturally ventilated greenhouses reduced the daily average of the inside air temperature (T ai ) by 2-6 • C [16][17][18][19] and reduced the transmitted solar radiation by 30-50% [18,20,21]. In arid summer climates (ambient air temperature, T am > 45 • C), shading the naturally ventilated greenhouse is not sufficient to provide an adequate environment for crop growth.…”

Section: Introductionmentioning

confidence: 99%

Predicting the Cooling Potential of Different Shading Methods for Greenhouses in Arid Regions

et al. 2019

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Shading greenhouses in a hot and sunny climate is essential to reduce the inside greenhouse air temperature. However, the type and location of nets need to be addressed properly to determine the shading method that provides a better cooling effect on the greenhouse air. This study was conducted to evaluate the effects of five different shading methods on greenhouse microclimates, and to investigate the cooling potential of each method. Four greenhouse models covered with 200-µm thick plastic film were used for the study: one was kept as control (C), one was whitened with slaked lime (L), and two were shaded with white and black nets (50% shading factor) deployed simultaneously at two locations, in contact (WC, BC) and at 20-cm distance from the cladding film (WD, BD). The microclimatic parameters were measured inside and outside the greenhouse models, and the cooling potential (CP) was predicted for each shading method. The results showed that the black net at 20-cm distance (BD) is desirable as it provides high CP with a reasonable solar radiation transmission. The maximum CP was estimated as 8.5 • C, 8 • C, 6 • C, 3.2 • C, and 2.1 • C for L, BD, BC, WD, and WC, respectively. Shading with white nets is not recommended because their cooling potential is very low. Based on these results, we developed correlations for predicting the CP for each shading method as a function of the transmitted solar radiation flux (S i ). These correlations depend on S i . Accordingly, they can be used for small greenhouses, whitewashed with a slaked lime of any concentration, or shaded with a black net having any shading factor.

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“…To this end, shading screens are the most used option (SERRANO et al, 2001), principally the thermoreflective screens, which have the ability to reduce the sensible heat accumulated inside the greenhouses by the incident solar radiation reflection (GUISELINI et al, 2010). However, the use of shading screens can restrict the photosynthetically active radiation quantity required by the crop (GARCÍA et al, 2011), which may compromise the tomato final yield.…”

Section: Introductionmentioning

confidence: 99%

Cherry tomato yield in greenhouses with different plastic covers

2017

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The objective of the present study was to evaluate the influence of different plastic covers on microclimate and cherry tomato yield in greenhouses. The experiments were carried out in Piracicaba, state of São Paulo (Brazil), during three growing periods (2008/2009/2010). A greenhouse was divided in: Environment I (EI) - covered with plastic film anti-UV and thermo-reflective shading screen, and Environment II (EII) - covered with diffusive plastic film; monitored with automatic weather sensors; and cultivated with cherry tomato (‘Sweet Grape’ and ‘Sweet Million’). Use of diffusive plastic in greenhouses provides a better inside distribution of solar energy without causing major changes in air temperature and relative humidity, resulting in higher yield (kg plant-1), fruits quantity (number plant-1) and fruits average weight than those obtained under thermo-reflective shading screen.

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Climatic effects of two cooling systems in greenhouses in the Mediterranean area: External mobile shading and fog system

Cited by 59 publications

References 28 publications

Cooling systems in screenhouses: Effect on microclimate, productivity and plant response in a tomato crop

Cooling systems in screenhouses: Effect on microclimate, productivity and plant response in a tomato crop

Predicting the Cooling Potential of Different Shading Methods for Greenhouses in Arid Regions

Cherry tomato yield in greenhouses with different plastic covers

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