Fórmulas DRIS para o diagnóstico nutricional de pomares de cupuaçueiros

Abstract

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 occur-rence of each nutrient in the different nutritional status and the multivariate analysis for discrimination the diagnostics be-tween 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.