Effect of Different Greenhouse Covering Materials on Inside Climate and on the Development of Tomato Plants

Baytorun, Nafi; Abak, K.; Tokgöz, Haluk; Altuntas, Ozlem

doi:10.17660/actahortic.1994.366.14

Cited by 12 publications

(11 citation statements)

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“…Previous work indicates that, depending on the characteristics of the polyethylene covering, the minimum air temperature may drop to lower values than outside the high tunnel. This is the result of the transparency of the film to IR radiation and has been documented by several investigators (Baytown et al, 1994;Maia et al, 1990;Montero et al, 1985) and modeled by Albright et al (1989) and Montero et al (2005). In that situation, one would expect minimum air temperatures at the edges of high tunnels on cold nights to be higher than in the center of the tunnel, but no one has so far documented this.…”

Section: Resultsmentioning

confidence: 85%

Microenvironmental Variations within the High Tunnel

Wien¹

2009

horts

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Simple unheated greenhouses covered with clear polyethylene, also known as high tunnels, in which plants are typically grown in the ground have become popular for extending the growing season for high-value horticultural crops. Although they are used principally to produce annual crops such as vegetables and cut flowers, increasing interest has focused on their use for perennial crops such as raspberries, blackberries, and ornamentals. Studies of temperature variation within the tunnel during the growing season have emphasized the rapid rise in air day temperature above ambient during the day and an equally rapid decrease at night. Spatial variation in temperature within the tunnel were much less marked, however, with air temperatures at the edge of a 10-m wide tunnel only ≈2 °C lower than in the center. For perennial crops, tunnel conditions during the off-season are also an important factor. In winter, air temperatures in the tunnel during sunny days rose above freezing even when ambient air temperatures stayed below freezing. Soil temperatures during the day and night fluctuated much less both inside and outside the tunnel and were significantly higher in the tunnel. Studies with nursery plants overwintered in similar structures indicate that spatial variation is again dwarfed by the overall air temperature fluctuation in these structures.

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Section: Resultsmentioning

confidence: 85%

Microenvironmental Variations within the High Tunnel

Wien¹

2009

horts

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“…In our work, this was occasionally observed at more moderate temperatures, but not at extremely low winter temperature events. The relatively high daytime ventilation temperatures used in this study ensured that significant heat accumulation did occur during the day, and greater nighttime heat retention has been shown for infrafed greenhouse coverings like that we used (Baytorun et al, 1994;Maia et al, 1990). Together, these may explain the high temperatures that we observed in unheated but protected environments, as compared with outdoors.…”

Section: Discussionmentioning

confidence: 79%

“…In our experiments, the minimum winter temperatures reached within the unheated high tunnel and inside the low tunnel within the high tunnel were considerably higher than outdoor temperatures. Several researchers have shown that tunnel temperatures equalize with, and briefly drop below, outdoor temperatures on cold nights (Baytorun et al, 1994;Montero et al, 1985;Wien 2009). In our work, this was occasionally observed at more moderate temperatures, but not at extremely low winter temperature events.…”

Section: Discussionmentioning

confidence: 99%

Survival and Yields of Fall-planted Winter Sprouting Broccoli Grown in High Tunnels for Spring Harvest in the Northeastern United States

Martin

Sideman

2012

hortte

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Winter sprouting broccoli [WSB (Brassica oleracea var. italica)] is a biennial crop that is typically planted in the fall and harvested in the spring in the United Kingdom. To evaluate their suitability as an early spring crop in the northeastern United States, 10 cultivars of WSB were grown in replicated experiments inside an unheated high tunnel over 2 years in Durham, NH. Results showed that the use of a secondary low tunnel covered with heavy rowcover (1.25 oz/yard2) significantly increased winter survival, yields, and earliness of all WSB cultivars. Cultivars differed in terms of days to maturity, yields, and shoot quality. For September planting dates, broccoli shoots were harvested from March to early May. Across cultivars, days to harvest range from 190 to 216 days in 2008–09, and from 209 to 238 days in 2009–10. Season-long yields ranged from 150 to 238 g/plant. The cultivars, Santee, Red Spear, White Sprouting Early, and Late White Star, were among the highest yielding cultivars that produced attractive and tender shoots, spanning the entire harvest season. Our experiments established that fall plantings of WSB may be overwintered in an unheated high tunnel for a spring harvest in USDA Hardiness Zone 5 sites.

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“…Compared to single layer PE, double layer PE covering material reduce fuel consumption by 40% (Nelson, 2003). Whether normal PE or covering materials with durable UV and IR should be used is one of the main issues in plastic greenhouses (Baytorun et al, 1994). Materials with high light conduction and low IR transmittance are preferred in order to keep thermal energy in a greenhouse (Hemming, 2005).…”

Section: Introductionmentioning

confidence: 99%

The Experimental Determination of The Impact of Overall Heat Consumption Coefficient and Thermal Screens on Heat Saving in Plastic Greenhouses

Çayli

Akyüz

2019

Kahramanmaraş Sütçü İmam Üniversitesi Tarım Ve Doğa Dergisi

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This study was conducted to experimentally determine the effect of thermal screens used for heat saving and overall heat consumption coefficient on heat loss in greenhouses. The trial was established in three different lettuce greenhouses with 150 m 2 in floor size using different plastic covering materials between January and April. Hot air vent heaters were used for heating. The heaters were positioned 30 cm above ground level. The heating was done between 08.00 p.m. and 05.00 a.m. Plant level and roof level as well as external temperature and relative humidity were measured with data loggers. These measurements were used to statistically calculate overall heat consumption coefficient based on wind speed. The results demonstrate that thermal screens created a resistance against heat loss, thus reducing heat losses. The effect of thermal screens on heat loss depending on the wind speed was also determined. It was found out that heat saving ratios in greenhouses varied between 8% to 22% under very low wind speeds and between 17%-36% under a wind speed of 4 m s-1 .

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Effect of Different Greenhouse Covering Materials on Inside Climate and on the Development of Tomato Plants

Cited by 12 publications

References 0 publications

Microenvironmental Variations within the High Tunnel

Microenvironmental Variations within the High Tunnel

Survival and Yields of Fall-planted Winter Sprouting Broccoli Grown in High Tunnels for Spring Harvest in the Northeastern United States

The Experimental Determination of The Impact of Overall Heat Consumption Coefficient and Thermal Screens on Heat Saving in Plastic Greenhouses

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