Electric conductivity and space between plants on baby leaf production in NFT hydroponic system inside greenhouse

Calori, Alex Humberto; Moraes, Lívia As; Purquerio, Luís Felipe Villani; Factor, Thiago Leandro; Júnior, Sebastião Lima; Tivelli, Sebastião Wilson

doi:10.17660/actahortic.2015.1107.42

Cited by 2 publications

(1 citation statement)

References 4 publications

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“…Rocket plants are generally harvested when they reach a height of about 15 cm [29]. Therefore, the experimental time adopted in the present work encompassed the typical growing cycle of commercial production, and the plants had already achieved a marketable size after one week from transplanting in perlite.…”

Section: Discussionmentioning

confidence: 99%

Copper and Zinc Accumulation in Young Leaves of Eruca sativa (L.) Grown in Soilless Culture

Chrysargyris,

Maggini,

Incrocci

et al. 2023

Horticulturae

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Heavy metals are environmental pollutants that cause toxicity in plants and represent a risk for human health, linked to bioaccumulation through the food chain. However, excess accumulation may not occur in young plants in the early stages of exposure to the toxic element. In the present work, rocket (Eruca sativa L.) plants grown in hydroponics were exposed for three weeks to excess concentrations (25, 50, or 100 µM) of Cu or Zn in the nutrient solution and were more sensitive to Cu than Zn toxicity. However, a significant decrease in the leaf biomass production as compared with the control was observed only after two or three weeks, and only minor signals of metal-induced adverse effects were evidenced concerning photosynthesis, oxidative stress indicators, antioxidant metabolites, and macronutrients. After two or three weeks, the leaf level of Cu occasionally approached the upper value associated with the recommended limits of dietary intake for human adults. However, as rocket leaves are commercialized when they achieve a 10–15 cm length, after one week of cultivation in perlite, the plants had an adequate size without metal contamination and could be considered suitable for the food market, even after exposure to Cu or Zn concentrations up to 100 µM.

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Section: Discussionmentioning

confidence: 99%

Copper and Zinc Accumulation in Young Leaves of Eruca sativa (L.) Grown in Soilless Culture

Chrysargyris,

Maggini,

Incrocci

et al. 2023

Horticulturae

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Baby leaf lettuce production in trays with reused and solarized substrate

et al. 2016

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Concerning the baby leaf production in trays, substrate can be reused for a certain number of times depending on its chemical and physical characteristics, but populations of pathogens such as Pythium aphanidermatum and Rhizoctonia solani that can cause damping off of lettuce, can build up during the reuse of this substrate. Solar treatment in a solar collector can be an alternative for the disinfestation of these substrates. Thus, the objective of this research was to study the reuse of coconut fiber substrate and its solar treatment in solar collector on baby leaf lettuce production. The experimental design was randomized blocks, in a factorial scheme 4 (first-use substrate, reused once, reused twice and reused three times) x 2 (with and without solar treatment), with four replications. The substrate reused 3 times provided the highest yield, 7.4 kg/m2, 14.8 cm plant height, 7.8 leaves, length and width of the largest leaf 13.9 and 4.8 cm, respectively; 3.4 and 0.21 g/plant fresh and dry mass, respectively; pH 6.8, 0.34 and 0.35 dS/m electrical conductivity, 25.1 and 30.2 mg/L NH4 + and 16.8 and 14.6 mg/L NO3 -, dry density 169 and 177 kg/m3 and water holding capacity 53 and 57% for substrates with and without solar treatment, respectively. There was an increase in the population of P. aphanidermatum, but the solar treatment was effective to eliminate this pathogen, and R. solani was not detected in the substrates. This study showed that the reuse of a coconut fiber substrate for one to three times could enhance the yield of lettuce baby leaf and promote the chemical and physical characteristics of the substrate.

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Electric conductivity and space between plants on baby leaf production in NFT hydroponic system inside greenhouse

Cited by 2 publications

References 4 publications

Copper and Zinc Accumulation in Young Leaves of Eruca sativa (L.) Grown in Soilless Culture

Copper and Zinc Accumulation in Young Leaves of Eruca sativa (L.) Grown in Soilless Culture

Baby leaf lettuce production in trays with reused and solarized substrate

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