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dc.contributor.authorMELO, F. de B.
dc.contributor.authorSOUZA, H. A. de
dc.contributor.authorBASTOS, E. A.
dc.contributor.authorCARDOSO, M. J.
dc.date.accessioned2020-09-26T09:11:34Z-
dc.date.available2020-09-26T09:11:34Z-
dc.date.created2020-09-25
dc.date.issued2020
dc.identifier.citationRevista Ciência Agronômica, v. 51, n. 4, e20196954, 2020.
dc.identifier.issn1806-6690
dc.identifier.urihttp://www.alice.cnptia.embrapa.br/alice/handle/doc/1125123-
dc.descriptionProposing sufficiency ranges and critical levels is an important technique for correct evaluation of leaf nutrient diagnosis. In this study, the objective was to propose critical levels and sufficiency ranges of macro- and micronutrients for the diagnostic leaf of cowpea, collected at flowering, with the results of macro- and micronutrients and productivity in the Northeast of Brazil. The critical level was calculated by the reduced normal distribution and by the boundary line method, which was also used to generate sufficiency ranges. For the critical level by reduced normal distribution, the relationship of the nutrients with 90% of maximum productivity was adopted. For the boundary line, the relationship of the nutrients that are in the upper line of a dispersion diagram was considered. The critical levels by reduced normal distribution for nitrogen (N), phosphorus (P), potassium (K), calcium (Ca), magnesium (Mg), copper (Cu), iron (Fe), manganese (Mn) and zinc (Zn) are: 35.3 g kg-1, 1.8 g kg-1, 20.5 g kg-1, 11.1 g kg-1, 2.6 g kg-1, 3.2 mg kg-1, 105 mg kg-1, 89 mg kg-1and 22 mg kg-1, respectively. However, the critical levels generated by the boundary line for N, P, K, Ca, Mg, Cu, Fe, Mn and Zn are 39.5 g kg-1, 2.3 g kg-1, 21.2 g kg-1, 11.3 g kg-1, 2.9 g kg-1, 4.2mg kg-1, 142 mg kg-1, 143mg kg-1 and 24 mg kg-1, respectively. The sufficiency ranges by the boundary line method, to achieve 95% of maximum productivity, are equivalent to 34.4-44.7g kg-1, 1.7-2.9 g kg-1,18.6-23.6 g kg-1,8.8-13.7 g kg-1,2.3-3.5 g kg-1,3.1-5.4 mg kg-1,73-210 mg kg-1,104-181 mg kg-1 and 22-27 mg kg-1 for N, P, K, Ca, Mg, Cu, Fe, Mn and Zn, respectively.
dc.language.isoeng
dc.rightsopenAccesseng
dc.titleCritical levels and sufficiency ranges for leaf nutrient diagnosis in cowpea grown in the Northeast region of Brazil.
dc.typeArtigo de periódico
dc.subject.thesagroFeijão de Corda
dc.subject.thesagroFolha
dc.subject.thesagroNutriente Mineral
dc.subject.thesagroNutrição Vegetal
dc.subject.thesagroVigna Unguiculata
dc.subject.nalthesaurusPlant micronutrients
dc.subject.nalthesaurusPlant nutrition
dc.subject.nalthesaurusCowpeas
dc.subject.nalthesaurusVigna
riaa.ainfo.id1125123
riaa.ainfo.lastupdate2021-02-12 -02:00:00
dc.identifier.doi10.5935/1806-6690.20200071
dc.contributor.institutionFRANCISCO DE BRITO MELO, CPAMN; HENRIQUE ANTUNES DE SOUZA, CPAMN; EDSON ALVES BASTOS, CPAMN; MILTON JOSE CARDOSO, CPAMN.
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