Nitrate concentration and nitrate/ammonium ratio on lettuce grown in hydroponics in Southern Amazon

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MetadadosDescriçãoIdioma
Autor(es): dc.creatorWenceslau, Daiane de Souza Lauton-
Autor(es): dc.creatorOliveira, Daniele Fátima de-
Autor(es): dc.creatorRabelo, Hudson de Oliveira-
Autor(es): dc.creatorFerbonink, Guilherme Ferreira-
Autor(es): dc.creatorGomes, Luiz Antônio Augusto-
Autor(es): dc.creatorLeonel, Érica Carina Aparecida-
Autor(es): dc.creatorCaione, Gustavo-
Data de aceite: dc.date.accessioned2026-02-09T12:42:46Z-
Data de disponibilização: dc.date.available2026-02-09T12:42:46Z-
Data de envio: dc.date.issued2022-06-09-
Data de envio: dc.date.issued2022-06-09-
Data de envio: dc.date.issued2021-06-30-
Fonte completa do material: dc.identifierhttps://repositorio.ufla.br/handle/1/50155-
Fonte: dc.identifier.urihttp://educapes.capes.gov.br/handle/capes/1166776-
Descrição: dc.descriptionLettuce has a predisposition to nitrate accumulation and has led many researchers to develop research to reduce this accumulation. The objective of this study was to evaluate the effect of nitrate concentration (NO3-) and nitrate/ammonium ratio (NO3-:NH4+) on growth, production and accumulation of these nitrogen compounds in lettuce grown in a hydroponic system in southern Amazon. There were performed two experiments with Iceberg lettuce type, in a floating-hydroponic system under protected cultivation. In the first experiment, five nitrate concentrations (2.5, 5.0, 7.5, 10.0 and 15.0 mmol L-1) were evaluated. In the second experiment, the best NO3- : NH4+ ratio was evaluated with five proportions 0:100, 25:75, 50:50, 75:25 and 100:0 in the nutrient solution. At 35 days after transplanting, the evaluations were performed. The nutrient solution containing nitrogen (N) as nitrate source in the concentration of 15.0 mmol L-1 contributed to higher lettuce productivity, being the concentration recommended for hydroponic grown system in southern Amazon. It is recommended to use about 23% of the N in nutrient solution in ammonium form, where higher N-ammonium concentrations are not indicated for Icebeg lettuce type because it reduces the productivity of this green leaf vegetable, causing toxicity symptoms.-
Formato: dc.formatapplication/pdf-
Idioma: dc.languageen-
Publicador: dc.publisherAcademic Journals (AJ)-
Direitos: dc.rightsAttribution 4.0 International-
Direitos: dc.rightsAttribution 4.0 International-
Direitos: dc.rightsacesso aberto-
Direitos: dc.rightshttp://creativecommons.org/licenses/by/4.0/-
Direitos: dc.rightshttp://creativecommons.org/licenses/by/4.0/-
???dc.source???: dc.sourceAfrican Journal of Agricultural Research (AJAR)-
Palavras-chave: dc.subjectNitrogen-
Palavras-chave: dc.subjectVegetable-
Palavras-chave: dc.subjectNutrient solution-
Palavras-chave: dc.subjectFood security-
Título: dc.titleNitrate concentration and nitrate/ammonium ratio on lettuce grown in hydroponics in Southern Amazon-
Tipo de arquivo: dc.typeArtigo-
Aparece nas coleções:Repositório Institucional da Universidade Federal de Lavras (RIUFLA)

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