The influence of shading on yield of glasshouse tomatoes

Cockshull, K. E.; Graves, C. J.; Cave, Carol R. J.

doi:10.1080/00221589.1992.11516215

Cited by 196 publications

(104 citation statements)

References 24 publications

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“…The photosynthetically active radiation (PAR) in EII was, on average, 92.8% higher than PAR observed under EI (Figure 1). Such results agree with the relationship obtained by COCKSHULL et al (1992), which considered that an increase of 1% in the PAR provided approximately an increase of 1% on tomato yield. Besides, the diffusive radiation promoted by EII reduced shading between plants, improving the SR absorption efficiency by them (SINCLAIR et al, 1992).…”

Section: Resultssupporting

confidence: 82%

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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Section: Resultssupporting

confidence: 82%

Cherry tomato yield in greenhouses with different plastic covers

2017

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“…Differences between the treatments were seen in terms of mean fruit mass and maximum diameter, with the physically largest fruits obtained in the T0 treatment, in which the EC was actually the highest (Table 4). Thus, the latter results may have been more the outcome of the lack of shading than any effect of EC (Cockshull et al, 1992;Papadopoulos and Parajasingham, 1997;Marcelis et al, 2006). The lower EC in T2 might be explained by differences between the treatments in the depth of the different growth substrate layers (Figure 2) plus possible differences in the speed of mineralisation of the manure layer.…”

Section: Discussionmentioning

confidence: 89%

“…Crop yield is linearly related to the amount of solar radiation reaching the plants, although fruit mass falls linearly with increasing temperature after the optimum temperature (18 ºC) is surpassed (Newton et al, 1999). Yields are also affected, since the fruits produced are smaller (Cockshull et al, 1992). Commercial production of tomatoes (Solanum lycopersycum L.) in shaded greenhouses may also be affected by a higher incidence of blossom end rot due to the maintenance of a higher relative humidity.…”

Section: Introductionmentioning

confidence: 99%

Greenhouse tomato production with electricity generation by roof-mounted flexible solar panels

Ureña-Sánchez

Callejón-Ferre

Pérez-Alonso

et al. 2012

Sci. agric. (Piracicaba, Braz.)

118

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The integration of renewable energy sources into greenhouse crop production in southeastern Spain could provide extra income for growers. Wind energy could be captured by small to medium-sized wind turbines, gas could be produced from biomass, and solar energy could be gathered by solar panels. The aim of this study was to examine the effect of flexible solar panels, mounted on top of a greenhouse for electricity production, on yield and fruit quality of tomatoes (Solanum lycopersycum L., cv Daniela). This study was undertaken in a commercial raspa y amagado greenhouse, typical of the Almería region (Spain). Tomato plantlets were planted at a density of 0.75 plants m −2 . The flexible solar panels were mounted on two parts of the roof in different arrangements (T1 and T2), each blacking out 9.8 % of its surface area. A control area (T0 arrangement) was fitted with no panels. No difference was found in terms of total or marketable production under these three arrangements, although fruit mean mass and maximum diameter of T0 were significantly greater than T1 and T2. Fruit in T0 matured earlier with more intense color compared with those in T1 and T2. However, these differences had no effect on price as the tomatoes produced under three conditions fell into the same commercial class (G class; diameter 67-81 mm). Solar panels covering 9.8 % roof area of the greenhouse did not affect yield and price of tomatoes despite of their negative effect on fruit size and color.

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“…The main disadvantages of whitewashing include a lack of uniformity of the layer of whitewash applied (Garzoli, 1989), which is difficult to remedy (see Fernández-Rodríguez et al, 1999). Too much whitewash may reduce the solar radiation entering a greenhouse too strongly, affecting growth (Cockshull et al, 1992;Challa and Bakker, 1998). Further, whitewash may not last very long since the coat applied is easily damaged by rainfall, dew and exterior condensation.…”

Section: Introductionmentioning

confidence: 99%

Effect of shading with aluminised screens on fruit production and quality in tomato (Solanum lycopersicum L.) under greenhouse conditions

Callejón-Ferre¹,

Manzano-Agugliaro

Díaz-Pérez

et al. 2009

Span. j. agric. res.

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The purpose of this study was to identify the effects of using aluminised screens offering different degrees of shading on the production and quality of tomato cv Atlético crops grown under greenhouse conditions. The study was performed in an Almería-type "raspa and amagado" commercial greenhouse with an area of 10,000 m 2 . The covering material was heat-insulating polyethylene (200 µm thick). The passive ventilation area of the greenhouse was 14%. Transplantation of the plantlets into the sandy mulch soil of the greenhouse was performed to leave a density of 1.78 plants m -2 . Plants were grown under extendable aluminised screens offering 40% (T40), 50% (T50) and 60% (T60) shading, as well as under traditional whitewashing conditions (control). The screens were used during the middle hours of the day in summer with a view to reducing radiation, and at night in autumn and winter to prevent the loss of heat via outgoing long-wave infrared radiation. Only the T60 treatment returned significantly different results compared to the control: the T60 fruit had a lower ºBrix but were firmer in both growing seasons.Additional key words: Brix degrees, climate control, firmness, fruit weight, pH, whitewashing. ResumenEfecto del sombreo mediante pantallas aluminizadas sobre la producción y calidad de fruto en tomate (Solanum lycopersicum L.) bajo invernaderoEl propósito del presente trabajo fue evaluar la posible ventaja del uso de las pantallas aluminizadas con diferentes proporciones de sombreo, sobre los principales atributos de producción y calidad en cultivo de tomate cv Atlético bajo invernadero. El estudio se realizó en un invernadero comercial tipo Almería de "raspa y amagado" de 10,000 m 2 . El material de la cubierta fue polietileno termoaislante de 200 µm de grosor y con un 14% de ventilación pasiva. El transplante se realizó en suelo arenado a una densidad de 1,78 plantas m -2 . El estudio comparó el uso de pantallas aluminizadas extensibles del 40% (T40), 50% (T50) y 60% (T60) de sombreo frente al testigo (encalado tradicional). Se utilizaron en los meses de verano durante las horas centrales del día con el objetivo de reducir la radiación y, en otoño e invierno, durante la noche para evitar la pérdida de temperatura por radiación infrarroja de onda larga. Tan sólo con T60 se obtuvieron diferencias significativas respecto del testigo, en ambas campañas, en cuanto a menor ºBrix y mayor firmeza del fruto. Un mayor sombreo produjo mayor firmeza y menor cantidad de sólidos solubles (ºBrix) en frutos.

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The influence of shading on yield of glasshouse tomatoes

Cited by 196 publications

References 24 publications

Cherry tomato yield in greenhouses with different plastic covers

Cherry tomato yield in greenhouses with different plastic covers

Greenhouse tomato production with electricity generation by roof-mounted flexible solar panels

Effect of shading with aluminised screens on fruit production and quality in tomato (Solanum lycopersicum L.) under greenhouse conditions

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