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dc.creatorWenceslau, Daiane de Souza Lauton-
dc.creatorOliveira, Daniele Fátima de-
dc.creatorRabelo, Hudson de Oliveira-
dc.creatorFerbonink, Guilherme Ferreira-
dc.creatorGomes, Luiz Antônio Augusto-
dc.creatorLeonel, Érica Carina Aparecida-
dc.creatorCaione, Gustavo-
dc.date.accessioned2022-06-09T16:50:03Z-
dc.date.available2022-06-09T16:50:03Z-
dc.date.issued2021-06-30-
dc.identifier.citationWENCESLAU, D. de S. L. et al. Nitrate concentration and nitrate/ammonium ratio on lettuce grown in hydroponics in Southern Amazon. African Journal of Agricultural Research , [S.l.], v. 17, n. 6, p. 862-868, June 2021. DOI: 10.5897/AJAR2020.15087.pt_BR
dc.identifier.urihttp://repositorio.ufla.br/jspui/handle/1/50155-
dc.description.abstractLettuce 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.pt_BR
dc.languageen_USpt_BR
dc.publisherAcademic Journals (AJ)pt_BR
dc.rightsAttribution 4.0 International*
dc.rightsacesso abertopt_BR
dc.rights.urihttp://creativecommons.org/licenses/by/4.0/*
dc.sourceAfrican Journal of Agricultural Research (AJAR)pt_BR
dc.subjectNitrogenpt_BR
dc.subjectVegetablept_BR
dc.subjectNutrient solutionpt_BR
dc.subjectFood securitypt_BR
dc.titleNitrate concentration and nitrate/ammonium ratio on lettuce grown in hydroponics in Southern Amazonpt_BR
dc.typeArtigopt_BR
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