Shading screens for frost protection

Teitel, M.; Peiper, Uri M.; Zvieli, Y

doi:10.1016/0168-1923(95)02321-6

Cited by 40 publications

(16 citation statements)

References 5 publications

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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: 98%

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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Section: Introductionmentioning

confidence: 98%

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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“…Therefore, any means of increasing the night-time temperature regime is of great importance, particularly if this is achieved by passive means without external heating (Montero et al, 1986;López, 2003). Research conducted by Teitel et al (1996) found that shading screens stretched horizontally over the crops acted as a barrier to thermal radiation and had positive repercussions for air and leaf temperatures under the screen. Aluminised screens proved to be more effective than either black or white screens.…”

Section: Introductionmentioning

confidence: 99%

“…Shading screens can also be effective in reducing the risk of frost damage (Teitel & Segal, 1995;Teitel et al, 1996) and eliminating the problem of thermal inversion. These problems occur on clear nights when a large amount of radiant heat is sent back to the sky.…”

Section: Introductionmentioning

confidence: 99%

“…Aluminised screens proved to be more effective than either black or white screens. Teitel et al (1996) suggested using screens only when frost damage was expected so as not to reduce the amount of light available during the day: this is possible when using dynamic or movable shading. Teitel's study was based on a very simple shelter formed by a woven screen in an open field.…”

Section: Introductionmentioning

confidence: 99%

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Shading screens for the improvement of the night time climate of unheated greenhouses

Montero¹,

Muñoz²,

Sánchez-Guerrero

et al. 2013

Span. j. agric. res.

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The objective of this work was to study the effect of shading screens, normally used during the day for cooling purposes, on the night-time climate of unheated greenhouses. For this purpose, first a number of experimental measurements were taken during cold nights to characterise the greenhouse climate both with and without an aluminised external screen. Secondly a Computational Fluid Dynamic (CFD) model of greenhouse was developed. After validation of the model by comparison with experimental data, the model was used to simulate the greenhouse climate for different sky conditions ranging from cloudless to overcast nights. Simulations were performed for a greenhouse with internal and external shading screens and for the same greenhouse without screens. Experimental results showed the positive effect of an external shading screen, whose use increased night-time temperature and reduced the risk of thermal inversion. Its effect was much stronger under clear sky conditions. The CFD model supported this conclusion and provided a detailed explanation of the temperature behaviour of all the greenhouse types considered. CFD simulations proved that an aluminised screen placed inside the greenhouse at gutter height gave the greatest thermal increase. Therefore, external or internal screens can help to increase the sustainability of greenhouse production in areas with mild winter climates by enhancing the use of solar energy stored in the greenhouse soil during the previous day and released at night-time.

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“…The extent of frost damage on a crop is dependent on plant type and variety, rate of temperature decrease, cloud and wind conditions during the freeze, soil type and water content, duration of frost, and crop growth stage [9][10][11]. Many plants are more resistant to frost during their early development stage and less frost resistant during the latter stages of the growth and development [10,12].…”

Section: Introductionmentioning

confidence: 99%

Spatiotemporal Variation of Frost within Growing Periods

Moeletsi

Tongwane

2017

Advances in Meteorology

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Frost is one of the devastating agroclimatological hazards affecting crop production in the Free State Province of South Africa. In this study, frost (0°C threshold) probabilities within different growing periods starting from the first dekad of October to the third dekad of February for a 100-day, 120-day, and 140-day crop were determined. The data used in the investigation was daily minimum temperature obtained from 55 weather stations located in and around the Free State Province with data from 1950 to 2010. The results show high spatial and temporal variability of frost within the different growing periods. The western, central, northern, and northwestern parts of the province have the longest planting window for all the growing lengths from mid-October to mid-January. The eastern, northeastern, southern, and southeastern parts of Free State have the highest frost risk with shortened planting window mostly from the first dekad of November to the second dekad of December. Thus, careful consideration of frost incidences is important for successful crop production in this area.

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Shading screens for frost protection

Cited by 40 publications

References 5 publications

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

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

Shading screens for the improvement of the night time climate of unheated greenhouses

Spatiotemporal Variation of Frost within Growing Periods

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