Photo-Selective Netting for Improved Performance of Horticultural Crops. A Review of Ornamental and Vegetable Studies Carried Out in Israel

Shahak, Yosepha

doi:10.17660/actahortic.2008.770.18

Cited by 96 publications

(80 citation statements)

References 10 publications

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“…According to Shahak (2008), black shading screen reduces the amount of light transmitted to the plants, but it does not affect the quality of the light, which means that the spectral composition remains the same. In this study it was possible to confirm this by the relationship PAR/ Qg of the T1, which was very similar to that obtained for T5 (Table 1).…”

Section: Resultsmentioning

confidence: 99%

“…These screens combine inside reduction of solar radiation with the stimulation of specific morphological and physiological reactions in plants, improving production efficiency and quality (Shahak, 2008). For Nomura et al (2009, the colorful screens have the ability to change the solar radiation intensity and its spectrum, becoming an alternative to the use of plant regulators.…”

Section: Palavrasmentioning

confidence: 99%

“…mainly in sunny and hot regions (AlHelal & Abdel-Ghany, 2010). Because of their physical structure, shading screens promote a mixture of direct and diffuse radiation, which is issued by the photo-selective threads (Shahak, 2008). However, not all microclimatic changes are beneficial for plants (Sentelhas & Santos, 1995).…”

Section: Introductionmentioning

confidence: 99%

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Bromeliads production in greenhouses associated to different shading screens

Holcman

Sentelhas

2013

Hortic. Bras.

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Bromeliads production in greenhouses is highly influenced by microclimate, which affects plants growth and development. Based on that, this study aimed to evaluate the influence of shading screens of different colors on microclimatic variables and Aechmea fasciata bromeliad growth in a greenhouse covered by transparent low-density polyethylene. The experiment had five treatments, with screens of different colors, inside a plastic greenhouse: thermo-reflective (T1); control without screen (T2); red (T3); blue (T4); and black (T5) screens, all of them with 70% of shading. From the 60 plants arranged in each one of the treatments 24 were evaluated, which were obtained randomly. The statistical design was completely randomized for the biometric variables. An automatic micrometeorological station was installed in each treatment, recording temperature, relative humidity and solar radiation. The plant parameters evaluated weekly were plant diameter and height, leaf width and length, and number of leaves per plant. The rosette diameter and leaf length were the parameters that presented the highest differences among treatments, which was basically a function of changes in solar radiation caused by the shading screens. The red screen provided the best conditions for A. fasciata bromeliad production.

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Section: Resultsmentioning

confidence: 99%

Section: Palavrasmentioning

confidence: 99%

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Bromeliads production in greenhouses associated to different shading screens

Holcman

Sentelhas

2013

Hortic. Bras.

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“…The colour of a net influences the spectral distribution of the radiation passing through the net absorbing their complementary colour. Shahak (2008) and Shahak et al (2009) e.g., describe the effect of different colours on different crop processes. For example, replacing traditional black shading net by either a red, yellow or pearl net with comparable shading factors resulted in 15-40% higher fruit production of different pepper cultivars.…”

Section: Light Spectrummentioning

confidence: 99%

Use of Natural and Artificial Light in Horticulture - Interaction of Plant and Technology

Hemming¹

2011

Acta Hortic.

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In intensive horticultural cultivation natural light levels often limit crop production during several periods. For an optimum plant production and product quality light intensity, spectrum and photoperiod have to be adapted to the needs of the crops at every moment. Light has to be optimised together with all other growth factors like temperature, humidity and CO 2 . For a sustainable greenhouse production the use of freely available sunlight has to be preferred. New transparent greenhouse covering materials, like ETFE, glass with new anti-reflection coatings or materials with micro-surface structures, transmit a very high amount of light into the greenhouse. Other new materials are able to scatter the incoming light and make it diffuse. Diffuse light penetrates deeper into the canopy, increases light interception by the crop, influences micro-climate and increases crop production by 6.5-9.2% in The Netherlands, the potential in lower latitudes is even higher. Other materials manipulate light spectrum. Photoselective nettings have been developed in different colours influencing morphogenesis and crop production. Fluorescent plastic films combine effects on morphogenesis with high light transmission, especially important for higher latitudes. When sunlight is optimized it can still be necessary to add artificial light to ensure a year-round supply of horticultural products. There is still room for improving the crop energy efficiency under artificial lighting by changing duration and intensity of lighting, different growing systems and plant densities. Since artificial lighting requires a high amount of energy, new artificial lighting systems have been developed, such as interlighting and light emitting diodes (LED). LED give the possibility for true light spectrum control in the future. The (partial) replacement of HPS lamps by LED systems is currently under investigation in Dutch greenhouses. Integration in current growing systems has full attention. In order to reach a high sustainable and economic beneficial production the factor light has to be integrated and optimized within the total horticultural system.

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“…Sendo assim, a luz vermelha atua no desenvolvimento da estrutura fotossintética, favorecendo o crescimento das plantas (SHAHAK et al, 2008). A luz vermelha atua no desenvolvimento da estrutura fotossintética das plantas, o que pode aumentar o acúmulo de amido em algumas espécies, pela inibição da translocação de assimilados para fora das folhas (SAEBO;MORTENSEN, 1996).…”

Section: Introductionunclassified

Produção de fitomassa de Sálvia officinalis L. cultivada sob malhas coloridas e doses de esterco avícola

et al. 2017

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Resumo: Objetivou-se avaliar o efeito da qualidade de luz na produção de fitomassa de plantas de Sálvia Oficcinalis L. cultivada sob malhas coloridas e doses de esterco avícola. O experimento foi conduzido em área experimental da Universidade Federal do Recôncavo da Bahia, onde as plantas foram dispostas em diferentes ambientes de luz e cinco doses de esterco avícola (0; 60; 120; 180 e 240 Kg ha -1 ). Aos 90 dias foram aferidas medidas não lineares: área foliar e peso de matéria seca e medidas lineares: número de folhas e altura das plantas. Houve uma interação significativa entre os ambientes de luz e as doses de esterco utilizadas para as variáveis área foliar (AF) e razão de massa foliar (RMF), encontrando os maiores valores de RMF com incremento de 72% e AF com 66% nas plantas submetidas as maiores doses de esterco. Analisando o efeito isolado dos ambientes de luz a malha vermelha teve destaque em todas as variáveis com exceção do número de folhas que não foram significativos. O uso de malhas coloridas em interação com doses de esterco avícola proporcionam expressivas respostas ao crescimento e desenvolvimento da Salvia officinalis.Palavras-chave: Ambientes de luz; Cama de frango; Fertilização Orgânica; Planta medicinal. Abstract:Objective to evaluate the effect of light quality on production of phytomass of Sálvia Oficcinalis L. cultivated under colored fabrics and doses of poultry manure. The experiment was conducted in an experimental area of the Federal University of Recôncavo of Bahia, where the plants were arranged in different light environments and five doses of poultry manure (0; 60; 120; 180 and 240 Kg ha -1 ). To 90 days were measured non-linear measures: leaf area and dry matter weight and linear measures: number of leaves and the height of the plants. There was a significant interaction between light environments and the doses of manure used for variables leaf area (AF) and foliar mass ratio (RMF), finding the highest values of RMF with 72% increment and AF with 66% in plants submitted the largest doses of manure. Analyzing the isolated effect of light red mesh environments had featured in all the variables with the exception of the number of sheets that were not significant. It is concluded that the use of colored meshes in interaction with doses of poultry manure provide significant responses to the growth and development of Salvia officinalis.

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Photo-Selective Netting for Improved Performance of Horticultural Crops. A Review of Ornamental and Vegetable Studies Carried Out in Israel

Cited by 96 publications

References 10 publications

Bromeliads production in greenhouses associated to different shading screens

Bromeliads production in greenhouses associated to different shading screens

Use of Natural and Artificial Light in Horticulture - Interaction of Plant and Technology

Produção de fitomassa de Sálvia officinalis L. cultivada sob malhas coloridas e doses de esterco avícola

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