Compositional nutrient diagnosis of corn using the Mahalanobis distance as nutrient imbalance index

dc.contributor.authorParent, Leon Etienne
dc.contributor.authorNatale, William [UNESP]
dc.contributor.authorZiadi, Noura
dc.contributor.institutionUniv Laval
dc.contributor.institutionUniversidade Estadual Paulista (Unesp)
dc.contributor.institutionAgr & Agri Food Canada
dc.date.accessioned2014-05-20T13:17:15Z
dc.date.available2014-05-20T13:17:15Z
dc.date.issued2009-08-01
dc.description.abstractParent, L. E., Natale, W. and Ziadi, N. 2009. Compositional nutrient diagnosis of corn using the Mahalanobis distance as nutrient imbalance index. Can. J. Soil Sci. 89: 383-390. Compositional nutrient diagnosis (CND) provides a plant nutrient imbalance index (CND - r(2)) with assumed chi(2) distribution. The Mahalanobis distance D(2), which detects outliers in compositional data sets, also has a chi(2) distribution. The objective of this paper was to compare D(2) and CND - r(2) nutrient imbalance indexes in corn (Zea mays L.). We measured grain yield as well as N, P, K, Ca, Mg, Cu, Fe, Mn, and Zn concentrations in the ear leaf at silk stage for 210 calibration sites in the St. Lawrence Lowlands [2300-2700 corn thermal units (CTU)] as well as 30 phosphorus (2300-2700 CTU; 10 sites) and 10 nitrogen (1900-2100 CTU; one site) replicated fertilizer treatments for validation. We derived CND norms as mean, standard deviation, and the inverse covariance matrix of centred log ratios (clr) for high yielding specimens (>= 9.0 Mg grain ha(-1) at 150 g H(2)O kg(-1) moisture content) in the 2300-2700 CTU zone. Using chi(2) = 17 (P < 0.05) with nine degrees of freedom (i.e., nine nutrients) as a rejection criterion for outliers and a yield threshold of 8.6 Mg ha(-1) after Cate-Nelson partitioning between low- and high-yielders in the P validation data set, D(2) misclassified two specimens compared with nine for CND -r(2). The D(2) classification was not significantly different from a chi(2) classification (P > 0.05), but the CND - r(2) classification differed significantly from chi(2) or D(2) (P < 0.001). A threshold value for nutrient imbalance could thus be derived probabilistically for conducting D(2) diagnosis, while the CND - r(2) nutrient imbalance threshold must be calibrated using fertilizer trials. In the proposed CND - D(2) procedure, D(2) is first computed to classify the specimen as possible outlier. Thereafter, nutrient indices are ranked in their order of limitation. The D(2) norms appeared less effective in the 1900-2100 CTU zone.en
dc.description.affiliationUniv Laval, Dept Soils & Agrifood Engn, Quebec City, PQ G1K 7P4, Canada
dc.description.affiliationSão Paulo State Univ, UNESP, Dept Soils & Fertilizers, São Paulo, Brazil
dc.description.affiliationAgr & Agri Food Canada, Soils & Crops Res & Dev Ctr, Quebec City, PQ G1V 2J3, Canada
dc.description.affiliationUnespSão Paulo State Univ, UNESP, Dept Soils & Fertilizers, São Paulo, Brazil
dc.description.sponsorshipNatural Sciences and Engineering Research Council of Canada (NSERC)
dc.description.sponsorshipIdNSERC: NSERC-DG 2254-04
dc.format.extent383-390
dc.identifier.citationCanadian Journal of Soil Science. Ottawa: Agricultural Inst Canada, v. 89, n. 4, p. 383-390, 2009.
dc.identifier.issn0008-4271
dc.identifier.lattes0618605154638494
dc.identifier.urihttp://hdl.handle.net/11449/3786
dc.identifier.wosWOS:000270489000002
dc.language.isoeng
dc.publisherAgricultural Inst Canada
dc.relation.ispartofCanadian Journal of Soil Science
dc.relation.ispartofjcr1.085
dc.relation.ispartofsjr0,520
dc.rights.accessRightsAcesso restrito
dc.sourceWeb of Science
dc.subjectNutrient balanceen
dc.subjectsimplex closureen
dc.subjectvariance-covariance matrixen
dc.subjectchi(2) distributionen
dc.subjectgrain cornen
dc.subjectnitrogen and phosphorus fertilizationen
dc.titleCompositional nutrient diagnosis of corn using the Mahalanobis distance as nutrient imbalance indexen
dc.typeArtigo
dcterms.licensehttp://www.aic.ca/journals/cjss_instructions.cfm
dcterms.rightsHolderAgricultural Inst Canada
unesp.author.lattes0618605154638494
unesp.campusUniversidade Estadual Paulista (Unesp), Faculdade de Ciências Agrárias e Veterinárias, Jaboticabalpt
unesp.departmentSolos e Adubos - FCAVpt

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