Chlorophyll meter-based leaf nitrogen status to manage nitrogen in tropical potato production

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MetadadosDescriçãoIdioma
Autor(es): dc.contributorUniversidade Estadual Paulista (Unesp)-
Autor(es): dc.contributorUniversity of Minnesota-
Autor(es): dc.creatorFernandes, Fabiana M. [UNESP]-
Autor(es): dc.creatorSoratto, Rogério P. [UNESP]-
Autor(es): dc.creatorFernandes, Adalton M. [UNESP]-
Autor(es): dc.creatorSouza, Emerson F. C.-
Data de aceite: dc.date.accessioned2022-02-22T00:50:06Z-
Data de disponibilização: dc.date.available2022-02-22T00:50:06Z-
Data de envio: dc.date.issued2021-06-25-
Data de envio: dc.date.issued2021-06-25-
Data de envio: dc.date.issued2020-12-31-
Fonte completa do material: dc.identifierhttp://dx.doi.org/10.1002/agj2.20589-
Fonte completa do material: dc.identifierhttp://hdl.handle.net/11449/207385-
Fonte: dc.identifier.urihttp://educapes.capes.gov.br/handle/11449/207385-
Descrição: dc.descriptionPotato (Solanum tuberosum L.) is a N intensive crop, and meeting its requirements with N fertilization is the primary practice to improve N recovery and achieve suitable tuber yield. A 3-site-year (SY) study was conducted to assess soil plant analysis development (SPAD)-502 chlorophyll meter efficacy for providing potato leaf real-time N status to adjust N timing and rate using nitrogen sufficiency index (NSI) thresholds of 90 or 95%. We evaluated effects of in-season SPAD-based N managements, as well as a reference with non-limiting N application, a fixed-timing (planting and hilling) conventional N fertilization, and a zero-N control on crop N uptake, tuber yield, and N-use efficiency of potato cultivar Agata grown in tropical clay soils. Tuber yields were similar in both SPAD-based managements. Under no intensive rainfall events after N applications, SPAD-based managements reduced N applications by 38–63% and resulted in comparable tuber set, bulking, and yield relative to conventional N fertilization. Additionally, SPAD-based management at a NSI threshold of 90% resulted in greater potato N-uptake efficiency and tuber yield per unit of N applied. SPAD-502 sensor was efficient for detecting plant N status when environmental conditions were more conducive for potato production and optimized N management by reducing application rates. However, with less favorable temperature and solar radiation for potato cultivation, and with intensive rainfall events following N application, SPAD readings did not guide to a proper N fertilization and resulted in reduced tuber yield. Therefore, under such conditions, a more accurate method for detecting plant N status should be used.-
Descrição: dc.descriptionDep. of Crop Science College of Agricultural Sciences São Paulo State Univesity (UNESP)-
Descrição: dc.descriptionCenter for Tropical Roots and Starches São Paulo State University (UNESP)-
Descrição: dc.descriptionDep. of Soil Water and Climate University of Minnesota-
Descrição: dc.descriptionDep. of Crop Science College of Agricultural Sciences São Paulo State Univesity (UNESP)-
Descrição: dc.descriptionCenter for Tropical Roots and Starches São Paulo State University (UNESP)-
Idioma: dc.languageen-
Relação: dc.relationAgronomy Journal-
???dc.source???: dc.sourceScopus-
Título: dc.titleChlorophyll meter-based leaf nitrogen status to manage nitrogen in tropical potato production-
Tipo de arquivo: dc.typelivro digital-
Aparece nas coleções:Repositório Institucional - Unesp

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