Application of a Portable Chlorophyll Meter to Assess the Nitrogen Sufficiency Index and Nitrogen Requirements in Sweet Potatoes

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Autor(es): dc.contributorUniversidade Estadual Paulista (UNESP)-
Autor(es): dc.contributorSt. Paul Campus-
Autor(es): dc.creatorRodrigues, Fabrício E.-
Autor(es): dc.creatorFernandes, Adalton M.-
Autor(es): dc.creatorOliveira, Arthur V.-
Autor(es): dc.creatorVargas, Pablo F.-
Autor(es): dc.creatorSouza, Emerson F. C.-
Autor(es): dc.creatorGuedes, Politon T. P.-
Autor(es): dc.creatorFigueiredo, Ricardo T.-
Autor(es): dc.creatorGuimarães, Ítala T.-
Data de aceite: dc.date.accessioned2025-08-21T15:21:00Z-
Data de disponibilização: dc.date.available2025-08-21T15:21:00Z-
Data de envio: dc.date.issued2025-04-29-
Data de envio: dc.date.issued2024-11-30-
Fonte completa do material: dc.identifierhttp://dx.doi.org/10.3390/agriculture14122167-
Fonte completa do material: dc.identifierhttps://hdl.handle.net/11449/299807-
Fonte: dc.identifier.urihttp://educapes.capes.gov.br/handle/11449/299807-
Descrição: dc.descriptionBalanced nitrogen (N) supply is essential for high root yield in sweet potatoes (Ipomoea potatoes [L.] Lam.). A portable chlorophyll meter can support N fertilization management. Here, we determined the appropriate N sufficiency index (NSI) for sweet potato leaves to achieve the best leaf N status, plant growth, N uptake and removal, and storage root yield and quality. Experiments were conducted at three sites (Braúna, São Manuel, and Regente Feijó) in São Paulo, Brazil, using a randomized block design with four replicates. Treatments included a control (without N application), conventional N fertilization (50 kg ha−1), reference N fertilization (150 kg ha−1), and NSI-based N fertilization (NSI: 90% or 95%, based on the chlorophyll meter readings). Plant response to N fertilization was low, with no N deficiency observed in the conventional and chlorophyll meter-managed treatments. NSI < 90% was better than NSI < 95% for N top-dressing management, reducing N application rates by 44–66%, depending on the site. In contrast, NSI < 95% increased the N application rate without any yield benefit. Thus, monitoring N fertilization using a portable chlorophyll meter with 90% NSI can reduce N fertilization rates without negatively impacting the sweet potato root yield.-
Descrição: dc.descriptionFundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP)-
Descrição: dc.descriptionCollege of Agricultural Sciences São Paulo State University (UNESP), São Paulo-
Descrição: dc.descriptionCenter for Tropical Roots and Starches (CERAT) São Paulo State University (UNESP), São Paulo-
Descrição: dc.descriptionFaculty of Agricultural Sciences of Vale do Ribeira (FCAVR) São Paulo State University (UNESP), São Paulo-
Descrição: dc.descriptionDepartment of Soil Water and Climate University of Minnesota St. Paul Campus, Falcon Heights-
Descrição: dc.descriptionCollege of Agricultural Sciences São Paulo State University (UNESP), São Paulo-
Descrição: dc.descriptionCenter for Tropical Roots and Starches (CERAT) São Paulo State University (UNESP), São Paulo-
Descrição: dc.descriptionFaculty of Agricultural Sciences of Vale do Ribeira (FCAVR) São Paulo State University (UNESP), São Paulo-
Descrição: dc.descriptionFAPESP: 2021/05039-9-
Descrição: dc.descriptionFAPESP: 2021/12973–0-
Idioma: dc.languageen-
Relação: dc.relationAgriculture (Switzerland)-
???dc.source???: dc.sourceScopus-
Palavras-chave: dc.subjectIpomoea batatas-
Palavras-chave: dc.subjectleaf N status-
Palavras-chave: dc.subjectN top-dressing fertilization-
Palavras-chave: dc.subjectSPAD index-
Título: dc.titleApplication of a Portable Chlorophyll Meter to Assess the Nitrogen Sufficiency Index and Nitrogen Requirements in Sweet Potatoes-
Tipo de arquivo: dc.typelivro digital-
Aparece nas coleções:Repositório Institucional - Unesp

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