Resumo

VENTURA ULLOA, Floricel et al. Interpretation methods of nutrient diagnosis in orange cv. Valencia (Citrus sinensis L. Osbeck). Terra Latinoam [online]. 2012, vol.30, n.2, pp.139-145. ISSN 2395-8030.

This study was conducted in Tabasco, Mexico, to compare accuracy, versatility and reliability of three methods of interpreting nutritional analysis for orange. The results of eighty-four sets of leaf analyses were interpreted under the Diagnostic and Recommendation Integrated System (DRIS), Deviation Optimum Percentage (DOP) and the conventional method or Sufficiency Ranges (RS) methods. Leaf samples for this study were collected under fixed criteria in cv. Valencia orange plantations, grown in Acrisols in the savanna of Huimanguillo, Tabasco. Each compound sample consisted of 80 healthy leaves, with which we determined concentration of N, P, K, Ca, Mg, Fe, Cu, Zn, Mn and B. The results of this study indicate that the DOP method detected the highest number of nutrients present at levels of deficiency. The DRIS method detected excess Fe, N and B, but the method DOP underestimated these elements, classifying them as deficient. The three methods of interpretation coincided in detecting deficient Mg in the plantations studied. It is concluded that interpreting nutritional diagnosis in Valencia oranges grown in Acrisol soils, at least two methods must be employed to obtain a reliable diagnosis.

Palavras-chave : nutrient balance; citrus; nutrient deficiency nutrimental; nutrient excess; nutriments.

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