Abstract:Nos sistemas de cultivo hidropônicos ou que utilizam a fertirrigação, a quantidade total de sais dissolvidos na solução nutritiva tem grande impacto na produtividade da cultura. A concentração adequada ao crescimento e desenvolvimento da cultura sofre variações marcantes ao longo do seu ciclo, podendo ser avaliada indiretamente por meio do monitoramento da condutividade elétrica da solução nutritiva. O objetivo deste trabalho foi avaliar um circuito eletrônico de baixo custo para a medição da condutividade elé… Show more
“…This behavior is due to the increase of nutrient solution temperature, which results in increased electrical conductivity thereof. A higher electrical conductivity favors increased nitrate content in lettuce leaves, because the conductivity of the nutritive solution does not only influence the absorption of water, but also the absorption of nutrients, both of which are closely linked (Steidle et al, 2005;Genuncio et al, 2012;Cometti et al, 2013). Tr -Root temperature, Ts -Stem temperature, Tm -Temperature of the middle of the plant, Tex -Temperature of the extremity of the plant.…”
The temperature of the nutrient solution in hydroponic crops of lettuce is a determinant of biomass yield and affects several physiological mechanisms of the plant. The aim of this study is to evaluate the influence of nutrient solution temperature on the levels of nitrate and pigments in leaves, as well as green mass yield and thermal flow in lettuce crop hydroponically. The experiment was conducted in a greenhouse at the Federal Technological University of Paraná. The nutrient solution was maintained at three temperatures (15 and 25°C and environmental temperature). The accumulated nitrate in leaf and photosynthetic pigment level were evaluated five times (28, 35, 42, 49 and 56 days after sowing). The total green mass yield and thermal flow behavior in the plants were assessed through thermographic analysis. The temperature of the solution influenced the levels of nitrate, chlorophyll and carotenoids in lettuce leaves, and green mass, which were larger at 25°C treatment. The root and stem had thermal equilibrium with the nutrient solution, while the temperature at the middle and upper part of the plant is similar to that of the environment.
“…This behavior is due to the increase of nutrient solution temperature, which results in increased electrical conductivity thereof. A higher electrical conductivity favors increased nitrate content in lettuce leaves, because the conductivity of the nutritive solution does not only influence the absorption of water, but also the absorption of nutrients, both of which are closely linked (Steidle et al, 2005;Genuncio et al, 2012;Cometti et al, 2013). Tr -Root temperature, Ts -Stem temperature, Tm -Temperature of the middle of the plant, Tex -Temperature of the extremity of the plant.…”
The temperature of the nutrient solution in hydroponic crops of lettuce is a determinant of biomass yield and affects several physiological mechanisms of the plant. The aim of this study is to evaluate the influence of nutrient solution temperature on the levels of nitrate and pigments in leaves, as well as green mass yield and thermal flow in lettuce crop hydroponically. The experiment was conducted in a greenhouse at the Federal Technological University of Paraná. The nutrient solution was maintained at three temperatures (15 and 25°C and environmental temperature). The accumulated nitrate in leaf and photosynthetic pigment level were evaluated five times (28, 35, 42, 49 and 56 days after sowing). The total green mass yield and thermal flow behavior in the plants were assessed through thermographic analysis. The temperature of the solution influenced the levels of nitrate, chlorophyll and carotenoids in lettuce leaves, and green mass, which were larger at 25°C treatment. The root and stem had thermal equilibrium with the nutrient solution, while the temperature at the middle and upper part of the plant is similar to that of the environment.
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