%0 Journal Article
%T Concentra  o foliar de mangan那s e zinco em laranjeiras adubadas com 車xidos e carbonatos via foliar Leaf concentrations of manganese and zinc in the orange fertilized via foliar application with oxides and carbonates
%A Leandro Jos谷 Grava de Godoy
%A Roberto Lyra Villas Bˋas
%A Rodrigo Seigi Yanagiwara
%A Clarice Backes
%J Revista Ci那ncia Agronˋmica
%D 2013
%I Universidade Federal do Cear芍
%X Dentre os micronutrientes, o Zn e o Mn limitam a produ  o dos citros, no Brasil. A aplica  o foliar tem sido a forma tradicional de fornecimento, contudo, a efici那ncia desta aduba  o depende de uma s谷rie de fatores, entre eles o tipo de fertilizante. Foram realizados dois experimentos em pomar com laranjeiras P那ra, enxertadas em lim o cravo, com sete anos de idade, em Botucatu, SP. No primeiro experimento foram avaliadas tr那s fontes de Mn via foliar: carbonato de mangan那s A, carbonato de mangan那s B e sulfato manganoso, em duas doses para cada fertilizante, correspondente a 250 e 500 g ha-1 de Mn, mais o controle, pulverizado somente com 芍gua. No segundo experimento foram testadas tr那s fontes de Zn para aplica  o foliar: 車xido de zinco A, 車xido de zinco B e sulfato de zinco, em duas doses para cada fertilizante, correspondente a 375 e 750 g ha-1 de Zn, mais o controle. As amostragens de folhas foram realizadas mensalmente, iniciando aos 30 dias ap車s aplica  o dos tratamentos. A aplica  o foliar com carbonato de mangan那s B, na dose de 500 g ha-1 Mn, e com 車xido de zinco B, na dose de 750 g ha-1, proporcionaram, respectivamente, n赤veis nutricionais adequados de Mn e Zn nas folhas de laranjeira. Na aus那ncia de chuvas, os teores adequados de Mn e Zn no solo, n o permitem suprir satisfatoriamente as laranjeiras P那ra enxertadas em limoeiro cravo. Among micronutrients, Zn and Mn limit the production of citrus in Brazil. Foliar application has been the traditional form of supply, however the efficiency of this type of fertilization depends on a number of factors, including the type of fertilizer used. Two experiments were conducted in an orchard of seven year old P那ra orange, grafted onto Rangpur lime, in Botucatu, S o Paulo. In the first experiment three sources of Mn, applied via foliar application, were evaluated: manganese carbonate A, manganese carbonate B and manganese sulphate, at two rates per fertilizer, corresponding to 250 and and 500g ha-1 of Mn, plus a control sprayed with water only. In the second experiment three sources of Zn were tested for foliar application: zinc oxide A, zinc oxide B and zinc sulphate at two rates per fertilizer, corresponding to 375 and 750g ha-1 of Zn, plus the control. Samples of leaves were collected monthly, beginning 30 days after application of the treatments. The foliar application of manganese carbonate B at a rate of 500g ha-1 Mn, and zinc oxide B at a rate of 750g ha-1, each provided adequate nutritional levels of Mn and Zn in the leaves of the orange. With the absence of rain, the appropriate levels of Mn and Zn i
%K Citrus sinensis L.
%K Aduba  o Foliar
%K Micronutrientes
%K Laranja
%K Citrus sinensis L.
%K Foliar fertilization
%K Micronutrients
%K Orange
%U http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1806-66902013000300004