Soil and leaf phosphorus thresholds for modern potato production systems in tropical Oxisols

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dc.contributor.authorSoratto, Rogério P. [UNESP]
dc.contributor.authorSandaña, Patricio
dc.contributor.authorFernandes, Adalton M. [UNESP]
dc.contributor.authorCalles, Tassiane S. [UNESP]
dc.contributor.authorYagi, Renato
dc.contributor.authorSouza, Emerson F.C.
dc.contributor.authorJob, André L.G.
dc.contributor.authorMartins, Jéssyca D.L. [UNESP]
dc.contributor.institutionUniversidade Estadual Paulista (UNESP)
dc.contributor.institutionUniversidad Austral de Chile
dc.contributor.institutionRural Development Institute of Paraná - IAPAR-EMATER (IDR-Paraná)
dc.contributor.institutionUniversity of Minnesota
dc.contributor.institutionMcCain Brasil
dc.date.accessioned2023-07-29T13:56:34Z
dc.date.available2023-07-29T13:56:34Z
dc.date.issued2023-08-01
dc.description.abstractPrecise diagnosis and prognosis of phosphorus (P) nutrition are essentials to improve P use efficiency and sustainability in potato cropping systems. Here, variable potato crop responses of 13 field experiments (2011–2022) were assessed to determine critical soil P-resin (SPresin) and potato leaf P (LP) concentrations to achieve maximum tuber yield in tropical Oxisols. The study comprised four experiments with the factorial design of potato cultivars in response to P fertilization rates and nine experiments with P fertilization rates as fixed effects. Relationships between initial SPresin test, LP measured at the third or fourth expanded leaf stage (i.e., 29–37 days after emergence, DAE), and relative total fresh tuber yield (RY) (yield of control/yield at highest P rate) were analyzed using linear-plateau, Mitscherlich, and quadratic-plateau regression models. A wide range of total fresh tuber yield (3.2–59 Mg ha-1) and LP (1.3–5.7 g P kg-1) were observed across experiments. The LP values in control plots was positively related with initial SPresin, reaching a maximum LP of 3.8 g P kg-1 at an initial SPresin of 80 mg P dm-3 (averaged across models). The relationship between RY and initial SPresin was significant in the three regression models (p < 0.05; R2 = 0.71–0.74). Maximum tuber yield was reached with the SPresin value of 93 mg P dm-3 (averaged across models). Across experiments and P fertilization rates, relationships between RY and LP were significantly described in the three regression models (p < 0.05; R2 = 0.55–0.67). The critical LP of 4.5 g P kg-1, obtained from the average across models, is proposed as the optimum indicator of potato P nutritional status to achieve maximum tuber yields in tropical Oxisols. These are the first critical P thresholds on a soil and environmental-specific conditions base available for tropical conditions in Brazil, timely informative in terms of optimization of P management to maximize tuber yield and P use efficiency, and minimize the risk of environmental P contamination.en
dc.description.affiliationDepartment of Crop Science College of Agricultural Sciences São Paulo State University (UNESP), SP
dc.description.affiliationCenter of Tropical Roots and Starches São Paulo State University (UNESP), SP
dc.description.affiliationInstitute of Plant Production and Protection Faculty of Agricultural and Food Sciences Universidad Austral de Chile Campus Isla Teja
dc.description.affiliationRural Development Institute of Paraná - IAPAR-EMATER (IDR-Paraná), PR
dc.description.affiliationDepartment of Soil Water and Climate University of Minnesota
dc.description.affiliationMcCain Brasil, MG
dc.description.affiliationUnespDepartment of Crop Science College of Agricultural Sciences São Paulo State University (UNESP), SP
dc.description.affiliationUnespCenter of Tropical Roots and Starches São Paulo State University (UNESP), SP
dc.description.sponsorshipFundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP)
dc.description.sponsorshipConselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq)
dc.description.sponsorshipIdFAPESP: 2010/04987-6
dc.description.sponsorshipIdFAPESP: 2013/04682-9
dc.description.sponsorshipIdCNPq: 456122/2014-1
dc.description.sponsorshipIdCNPq: 480757/2010-0
dc.identifierhttp://dx.doi.org/10.1016/j.eja.2023.126880
dc.identifier.citationEuropean Journal of Agronomy, v. 148.
dc.identifier.doi10.1016/j.eja.2023.126880
dc.identifier.issn1161-0301
dc.identifier.scopus2-s2.0-85160335857
dc.identifier.urihttp://hdl.handle.net/11449/248891
dc.language.isoeng
dc.relation.ispartofEuropean Journal of Agronomy
dc.sourceScopus
dc.subjectCritical threshold
dc.subjectFertilization efficiency
dc.subjectPhosphorus nutrition
dc.subjectSolanum tuberosum
dc.titleSoil and leaf phosphorus thresholds for modern potato production systems in tropical Oxisolsen
dc.typeArtigo
unesp.author.orcid0000-0002-8610-1229[2]
unesp.author.orcid0000-0002-1111-0040[5]

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Botucatu - CERAT - Centro de Raízes e Amidos Tropicais