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

Abstract

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...

Productivity and growth in cowpea inoculated with rhizobia under different light environments

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Plant biometric characterization and leaf micromorphometry of Talinum triangulare (Jacq.) Willd cultivated under shade

“…It is crucial to understand the physiology of plant development, as well as the impacts of abiotic and biotic factors, so that management practices can be adopted to improve plant productivity (Goenaga, 1995). Several studies have reported the benefit of using shade for the cultivation of different plant species, such as leaf cactus (Queiroz et al, 2015), taro (Oliveira et al, 2011), rocket salad (Grangeiro et al, 2011), coriander (Grangeiro et al, 2011), and watercress (Hirata & Hirata, 2015), among others.…”

Production of Cherry Tomato Chips in Different Types of Protected Environment

“…In general, photosynthesis decreases as respiration and photorespiration processes increase, affecting the biomass of the plant as a whole (WAHID et al, 2007;LAMBERS et al, 2008). Hirata and Hirata (2015), when evaluating the productive performance of watercress cultivated in soil under shade screens, concluded that in the fresh matter mass of the aerial part, the black shade screen responded better than the red photoconverter screen and in full sun. However, the data differ from this tested experiment in that there was no difference between treatments.…”