Data/hora: 12/06/2024 15:06:22

Provedor de dados: | 90
País: | Brazil
Título: | DRIS formulas for evaluation of nutritional status of cupuaçu trees
Autores: | Dias,Jairo Rafael Machado; Wadt,Paulo Guilherme Salvador; Perez,Daniel Vidal; Silva,Lucielio Manoel da; Lemos,Cleigiane de Oliveira.
Data: | 2011-12-01
Ano: | 2011
Palavras-chave: | Theobroma grandiflorum; Foliar diagnosis; Fruit; Nutritional status.
Resumo: | DRIS, an Diagnosis and Recommendation Integrated System, is a tool to evaluate the nutritional status of plants. Different DRIS formulas have been proposed to improve the efficiency of the crop nutrition diagnoses. The objective of 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 of agreement in commercial orchards of Theobrama grandiflorum trees. Leaf samples of 5 to 18 year-old cupuaçu trees were collected from 153 commercial orchards in agroforestry and monoculture systems in the state of Rondonia, Brazil. Bivariate relationships between nutrition concentrations in healthy trees were used to calculate DRIS norms. DRIS indices were calculated based on the different formulas and interpreted by the Potential Fertilizer Response method, in five categories. The DRIS norms, DRIS index calculations and their interpretations were developed using the DRIS Cupuaçu computer program (www.dris.com.br). The different DRIS formulas resulted in similar diagnoses with a degree of agreement of &gt; 90% for the nutrients N, P, K, Ca, and Mg.
Tipo: | Info:eu-repo/semantics/article
Idioma: | Inglês
Identificador: | http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-06832011000600023
Editor: | Sociedade Brasileira de Ciência do Solo
Relação: | 10.1590/S0100-06832011000600023
Formato: | text/html
Fonte: | Revista Brasileira de Ciência do Solo  v.35 n.6 2011
Fonte: | info:eu-repo/semantics/openAccess