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In order to use nutritional-composition diagnosis or the diagnosis and integrated recommendation system of multivariate relationships (DRIS) when assessing the nutritional status of the orange, it becomes necessary to define reference values that are suitable for indicating nutritional conditions. This study aimed to establish multivariate DRIS standards, and to evaluate their comparative performance in assessing the nutritional status of the Pera orange in the state of Amazonas against nutritional standards as defined in the literature. We evaluated the nutritional status of 120 commercial plots of a hybrid of the Pera orange and Rangpur lime, the reference values being defined from the group of plots. DRIS standards for nitrogen (N), phosphorus (P), potassium (K), calcium (Ca), magnesium (Mg), sulfur (S), boron (B), copper (Cu), iron (Fe), manganese (Mn) and zinc (Zn) were established and nutritional diagnosis by DRIS, combined with the comparative use of generic standards to those proposed in the literature, showed a low level of agreement when assessing the nutritional status of the Pera orange in the state of Amazonas.

Normas DRIS multivariadas para avaliação do estado nutricional de laranjeira 'Pera' no estado do Amazonas