Dris formulas for evaluation of nutritional status of cupuaçu trees.

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Author(s): DIAS, J. R. M.; WADT, P. G. S.; PEREZ, D. V.; SILVA, L. M. da; LEMOS, C. de O.

Summary: DRIS, anDiagnosis and Recommendation Integrated System, is a tool toevaluate the nutritional status of plants. Different DRIS formulas have beenproposed to improve the efficiency of the crop nutrition diagnoses. The objectiveof this study was to compare the nutritional diagnosis of the formulas of Beaufils(1973), of Jones (1981) and of Elwali and Gascho (1984), based on the degree ofagreement in commercial orchards of Theobrama grandiflorum trees. Leafsamples of 5 to 18 year-old cupuaçu trees were collected from 153 commercialorchards in agroforestry and monoculture systems in the state of Rondonia, Brazil.Bivariate relationships between nutrition concentrations in healthy trees wereused to calculate DRIS norms. DRIS indices were calculated based on the differentformulas and interpreted by the Potential Fertilizer Response method, in fivecategories. The DRIS norms, DRIS index calculations and their interpretationswere developed using the DRIS Cupuaçu computer program (http://www.dris.com.br).The different DRIS formulas resulted in similar diagnoses with a degree ofagreement of > 90% for the nutrients N, P, K, Ca, and Mg. O Sistema Integrado de Diagnose e Recomendação (DRIS) é uma ferramenta usadapara avaliação do estado nutricional de plantas. Diferentes fórmulas DRIS têm sido propostaspara melhorar a eficiência do diagnóstico nutricional de culturas. O objetivo deste trabalhofoi comparar o diagnóstico nutricional das fórmulas de Beaufils (1973), de Jones (1981) e deElwali & Gascho (1984), por meio do grau de concordância para pomares comerciais deárvores de Theobroma grandiflorum. Amostras foliares de árvores de cupuaçu foram coletadasde 153 pomares comerciais com idade variando entre 5 e 18anos, cultivados em sistemasagroflorestais ou monocultivos, no Estado de Rondônia. Relações bivariadas entre asconcentrações dos nutrientes de árvores sadias foram usadas para calcular as normas DRIS.Os índices DRIS foram calculados pelas diferentes fórmulas interpretadas pelo método doPotencial de Resposta à Adubação em cinco categorias. As normas DRIS, o cálculo dosíndices DRIS e sua interpretação foram feitos pelo aplicativo computacional Dris Cupuaçu(http://www.dris.com.br). As diferentes fórmulas DRIS resultaram em diagnósticos similares, comgrau de concordância maior que 90 % para os nutrientes N, P, K, Ca e Mg.

Publication year: 2011

Types of publication: Journal article

Unit: Embrapa Acre

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