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WADT, Paulo Guilherme Salvador; DIAS, Jairo Rafael Machado; PEREZ, Daniel Vidal  and  LEMOS, Cleigiane de Oliveira. DRIS functions for nutritional evaluation of cupuaçu trees. Bragantia [online]. 2011, vol.70, n.3, pp.649-656. ISSN 0006-8705.

The objective was to evaluate the DRIS formulas performance for diagnosis of the nutritional status of cupuaçu trees. Foliar analysis of 153 commercial orchards located in the district of Nova California, Porto Velho, Brazil, were used to compare  nutritional status by Beaufils formulas, using bivariate log-transformed relations and the concept of Potential Response to Fertilization for interpreting DRIS indices. The coincidence between the diagnosis by each formula, the frequency of occurrence of each nutrient in the different nutritional status and the multivariate analysis for discrimination the diagnostics between the formulas were evaluated.  The results show that Beaufils and Jones formulas were similar; however, differing from Wadt et al. formula. Currently, the results do not allow the choice of one formula as the best option for adoption in fertilizer recommendation programs.

Keywords : nutritional state; foliar diagnosis; tropical fruit trees; Amazon; Theobroma grandiflorum.

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