Telas agrícolas como subcobertura no cultivo de alface hidropônica

Sales, Francisco Alexandre de Lima; Filho, José Antônio Delfino Barbosa; Barbosa, João Paulo Rodrigues Alves Delfino; Viana, Thales Vinícius de Araújo; Freitas, Cley Anderson Silva de

doi:10.1590/0103-8478cr20120633

Cited by 10 publications

(14 citation statements)

References 15 publications

(9 reference statements)

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“…Lettuce cultivated in tropical regions with silver, black and red mesh showed a net increase in the number of leaves and the leaf area index, and this effect was attributed to the lower temperature promoted by the three mesh (Sales, Barbosa Filho, Barbosa, Viana, & Freitas, 2014). The authors also verified a respective decrease of 4.7 °C and 3.6 °C in the average temperatures inside the environments when compared to the control environment (covered with transparent plastic), providing results that match those found in the present study.…”

Section: Resultsmentioning

confidence: 99%

Does Knitted Shade Provide Temperature Reduction and Increase Yield Kale?

Júnior¹,

Ponce²,

Toledo³

et al. 2019

JAS

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We aimed to evaluate whether the air temperature, soil temperature, and luminosity in a low tunnel covered with agricultural mesh screening affected the characteristics of kale production. The study was conducted on the cultivation of kale in six different growing environments. The experimental setup consisted of randomized block design (RBD) with factorial analysis (2 × 6) with four repetitions. The kale (Brassica oleracea L. var. acephala) hybrids Hi Crop and Kobe F1 were used as plant material. The growing environments were open field and protected environments consisting of low tunnels, each covered with a different mesh screen: red, thermo-reflective silver, black, tissue-non-tissue (TNT), and organza fabric. Sensors were installed within each environment to monitor air temperature and soil temperature. The TNT screen resulted in the highest air and soil temperatures and lower yield. The black mesh resulted in lower temperatures than other coverings. Organza fabric provided the best yield (22.8%) compared to open field and it was 9.89to42.19 % more productive compared to the other meshes. Organza fabric was the best environment for the cultivation of kale in tropical climates. These data confirm that kale biomass production was greatly affected by stress high temperature.

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Section: Resultsmentioning

confidence: 99%

Does Knitted Shade Provide Temperature Reduction and Increase Yield Kale?

Júnior¹,

Ponce²,

Toledo³

et al. 2019

JAS

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“…Under this condition, plants had the photosynthetic process compromised, producing less dry mass (He et al, 2016). However, shading favored the reduction in air and soil temperature (Table 4), which provided for a more suitable environment for plant growth and development, considering that in high temperatures, the vegetative development of the culture is affected, due to the juvenile phase acceleration, moving prematurely to the reproductive phase with low dry mass accumulation (Sales et al, 2014). According to Taiz et al (2017), the high temperature affects the speed of chemical reactions and internal process for solutes transportation and, consequently, the normal development of the plants.…”

Section: Resultsmentioning

confidence: 99%

“…The adaptation to different environments of cultivation varies according to the genetic potential of each group or cultivar, being essential knowledge about the different shading conditions (Guerra et al, 2017). A few researchers have reported the effect of shading screens in lettuce crops, such as Fu et al (2012), Sales et al (2014) and Gonçalves et al (2017), as well as the behavior of different cultivars, as demonstrated by Guimarães et al (2011), Souza et al (2013) and Blind and Silva Filho (2015). However, studies involving simultaneously different shading levels and lettuce cultivars are scarce, mainly those involving different groups.…”

Section: Introductionmentioning

confidence: 99%

Shading on Yield and Quality of Lettuce Cultivars in Semiarid Conditions

Júnior¹,

Queiroga²,

Sousa³

et al. 2019

JAS

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Lettuce is a crop originating from temperate climate, and for this reason, when cultivated in semiarid region, characterized by high luminosity and temperature, major losses in productivity and quality occur. The objective of this work was to evaluate the influence of different levels of shade on yield and quality of lettuce cultivars in semiarid conditions. The experiment was conducted under field conditions at the Human and Agricultural Sciences Center at State University of Paraiba, Brazil, in randomized blocks with parcels divided into 4 × 4 factorial space, and four repetitions. The parcels received different shading levels (0, 30, 50 and 70%) with black polypropylene screen and sub parcels by lettuce cultivars: ‘Americana Irene’, ‘White Boston’, ‘Regina de Verão’ and ‘Green Salad Bowl’. The shading promoted higher performance in height, stem diameter, root length, pH and dry mass of lettuce plants when compared to those grown in the open-air, being the shading of 70% the more efficient. The ‘Americana Irene’ cultivar was distinguished in terms of plant height, foliage area, leaves dry mass and soluble solids, independently from the cultivation environment. With the shading, this cultivar improved the aerial shoot-root ratio and root dry mass.

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“…As telas vermelha 35% e branca/prata 20% apresentaram valores intermediários de temperatura do solo (Tabela 1). Sales et al (2014) verificaram que a tela vermelha, como subcobertura de uma estufa coberta com filme plástico, não reduziu a temperatura máxima média do ambiente, enquanto a tela prata reduziu, em 4,0ºC, a temperatura do interior da estufa.…”

Section: Resultsunclassified

“…No segundo ciclo de desenvolvimento, também foi observada a mesma tendência no tamanho das folhas. Isso porque plantas cultivadas sob telas de sombreamento apresentam aumento da área foliar para maior interceptação da luz (Espindola Junior et al, 2009;Oliveira et al, 2011;Otoni et al, 2012;Sales et al, 2014), enquanto plantas expostas ao sol apresentam menores áreas foliares, como defesa à transpiração e à elevação da temperatura (Niinemets & Fleck, 2002). Além disso, Ribeiro et al (2012) apontam que a qualidade e a intensidade da radiação que incide sobre as folhas das plantas também promovem modificações na espessura do mesófilo, dos tecidos vasculares, da epiderme, da cutícula, da densidade e das demais características estomáticas, para tolerância a essas condições.…”

Section: Resultsunclassified

Desempenho produtivo do agrião d'água cultivado em solo sob telas de sombreamento

Hirata

2015

Pesq. agropec. bras.

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Resumo -O objetivo deste trabalho foi avaliar o desempenho produtivo do agrião d'água (Rorippa nasturtium-aquaticum) cultivado em solo sob diferentes telas de sombreamento e a pleno sol, em dois ciclos consecutivos (muda e rebrota). Os tratamentos consistiram do cultivo do agrião d'água sob telas de sombreamento preta 35%, prata 35%, vermelha 35%, branca/prata 20% e a pleno sol (controle), em delineamento de blocos ao acaso com quatro repetições. No primeiro ciclo de desenvolvimento do agrião d'água, houve incremento de até 59% na produção de massa fresca sob sombreamento. A massa fresca proveniente da rebrota do agrião d'água variou de 419 g m -2 , a pleno sol, a 3.027,7 g m -2 sob a tela prata 35%. Houve incremento do tamanho das folhas e da altura do dossel sob sombreamento. A temperatura do solo na profundidade de 4,0 cm foi reduzida em até 3ºC pelas telas de sombreamento, em comparação ao tratamento a pleno sol. Telas de sombreamento promovem aumento na produtividade, no tamanho das folhas e na altura do dossel do agrião d'água cultivado em solo, nos ciclos de muda e rebrota, com maior produtividade sob as telas preta 35% e prata 35%.Termos para indexação: Nasturtium officinale, Rorippa nasturtium-aquaticum, ciclos de cultivo, cultivo em solo, sombreamento artificial. Agronomic performance of watercress grown in soil under shade clothAbstract -The objective of this work was to evaluate the agronomic performance of watercress (Rorippa nasturtium-aquaticum) grown in soil under different shade clothes and full sun in two development cycles (seedling and regrowth). The treatments consisted of watercress grown under 35% black, 35% silver, 35% red, 20% white/silver shade clothes, and under full sun (control), in a randomized complete block design with four replicates. In the first watercress development cycle, there was an increase in fresh weight of up to 59% under shade. The fresh matter from watercress regrowth ranged from 419 g m -2 , under full sun, to 3,027.7 g m -2under the 35% silver shade cloth. Leaf size and canopy height increased under shade. Soil temperature at the 4.0-cm depth was reduced up to 3°C with the shade clothes, when compared to the full sun treatment. Shade clothes promote greater yield, leaf size, and canopy height in watercress grown in soil, during the seedling and regrowth cycles, with higher yield for the 35% black and 35% silver shade screens.Index terms: Nasturtium officinale, Rorippa nasturtium-aquaticum, crop cycles, growing in soil, artificial shading. IntroduçãoO agrião d'água [Rorippa nasturtium-aquaticum (L.) Hayek] é uma brassicácea semiperene, adaptada a clima ameno e cultivada no outono-inverno, na maioria das regiões. A cultivar tradicional Folha Larga produz plantas vigorosas, de alta capacidade de perfilhamento, com folhas tenras e arredondadas. O caule é rastejante, do qual se desenvolvem finas raízes aquáticas, que retiram nutrientes do meio líquido, e raízes pivotantes, que fixam a planta ao solo. Por se tratar de uma planta semiaquática, a espécie se desenvolve adeq...

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Telas agrícolas como subcobertura no cultivo de alface hidropônica

Abstract: RESUMO Este trabalho teve como objetivo avaliar o efeito de diferentes tipos de telas de sombreamento utilizadas como subcobertura no cultivo hidropônico de alface. Para isso, foi

Cited by 10 publications

References 15 publications

Does Knitted Shade Provide Temperature Reduction and Increase Yield Kale?

Does Knitted Shade Provide Temperature Reduction and Increase Yield Kale?

Shading on Yield and Quality of Lettuce Cultivars in Semiarid Conditions

Desempenho produtivo do agrião d'água cultivado em solo sob telas de sombreamento

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