%0 Journal Article
%T Carbohydrate levels in the leaves and production consistency of the Ponkan tangerine when thinned out with Ethephon Teores de carboidratos nas folhas e regularidade da produ  o de tangerineira 'Ponkan' raleadas com Ethephon
%A Rodrigo Amato Moreira
%A Jos¨¦ Darlan Ramos
%A Maria do C¨¦u Monteiro da Cruz
%A L¨ªlian de Ara¨²jo Pantoja
%J Revista Ci¨ºncia Agron£¿mica
%D 2013
%I Universidade Federal do Cear¨¢
%X Management practices that maintain carbohydrate reserves in tangerines are necessary in order to ensure good yields. This experiment was carried out with the object of evaluating the levels of carbohydrates in the leaves, and consistency in the production of the Ponkan tangerine (Citrus reticulata Blanco) when subjected to chemical thinning with five concentrations of Ethephon for three consecutive years. The Ponkan tangerine evaluated had been grafted onto Rangpur lime (Citrus limonia Osbeck), cultivated with a spacing of 6.0 x 3.0 m and were 12 years old. The Ethephon concentrations tested were: 0; 200; 400; 600 and 800 mg L-1, applied in January of 2009; 2010 and 2011, when the fruits were of 25 to 30mm in transverse diameter. The experimental design was of randomized blocks, with four blocks and four plants per plot. The levels of soluble leaf carbohydrate, starch and total carbohydrates were evaluated during flowering and harvesting. Fifteen days after application of the concentrations, the percentage of thinning was evaluated. Production, pending load and alternate bearing were evaluated when harvesting. Chemical thinning with Ethephon favors the maintaining of leaf carbohydrates in the Ponkan tangerine. The most effective concentration in reduncing the alternate bearing in the Ponkan tangerine is 600 mg L-1 of Ethephon. Pr¨¢ticas de manejo que proporcionem a manuten  o das reservas de carboidratos nas tangerineiras s o necess¨¢rias para garantir boas produtividades. O experimento foi conduzido com o objetivo de avaliar os teores de carboidratos foliares e a regularidade da produ  o de tangerineira 'Ponkan' (Citrus reticulata Blanco) submetida ao raleio qu¨ªmico com cinco concentra  es de Ethephon por tr¨ºs anos consecutivos. As tangerineiras 'Ponkan' avaliadas estavam enxertadas sobre limoeiro 'Cravo' (Citrus limonia Osbeck), cultivadas no espa amento 6,0 x 3,0 m e com 12 anos de idade. As concentra  es de Ethephon testadas foram: 0; 200; 400; 600 e 800 mg L-1, aplicadas quando as frutas estavam com 25 a 30 mm de diametro transversal, nos meses de janeiro de 2009, de 2010 e de 2011. O delineamento experimental utilizado foi em blocos casualizados, com quatro blocos e quatro plantas por parcela. Foram avaliados os teores foliares de carboidratos sol¨²veis, de amido e de carboidratos totais nos per¨ªodos de flora  o e de colheita. Ap¨®s 15 dias da aplica  o das concentra  es avaliou-se o percentual de raleio. Nas colheitas foram avaliadas a produ  o, a carga pendente e a alternancia de produ  o. O raleio qu¨ªmico com Ethephon favorece a manuten  o dos teor
%K Citrus reticulata Blanco
%K Raleio qu¨ªmico
%K Alternancia de produ  o
%K Etileno
%K Citrus reticulata Blanco
%K Chemical thinning
%K Alternate bearing
%K Ethylene
%U http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1806-66902013000300020