thidiazuron effects on shoot growth, return bloom, fruit set and nutrition of apples efeito do thidiazuron no crescimento, no florescimento, na frutificação e na nutrição em macieiras

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ID: 147283
2002
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Ranked #55 of 193 articles by views in proc - the fourth ieee workshop on software technol for future embedded and ubiquitous syst, seus 2006 andthe second int workshop on collaborative comput, integr, and assur, wccia 2006

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Abstract
Apple (Malus domestica Borkh.) trees, cultivars Gala and Fuji, were sprayed at full bloom with thidiazuron (TDZ) at doses of 0, 5, 10, or 20 g ha-1 of a.i. in order to evaluate its effects on plant growth and development, return bloom, fruit set, nutrition, and fruit yield. Fruit set increased with TDZ dose in 'Gala' but not in 'Fuji'. TDZ did not affect fruit yield in any cultivar. In 'Gala', the return bloom was reduced in about 50% at TDZ doses of 10 or 20 g ha-1. TDZ increased shoot growth in both cultivars. In leaves, TDZ decreased the concentration of Ca and Mg in 'Gala' and of Mg in 'Fuji', but did not affect the chlorophyll content, leaf area, length, width, and dry mass per cm² regardless of cultivar. In fruits, the effect of TDZ varied according to the portion evaluated. Highest doses of TDZ decreased the concentration of Ca and K in 'Gala' and of K in 'Fuji' in the entire fruits (flesh + skin); in the skin, highest doses of TDZ reduced the levels of N, Ca, and Mg in both cultivars, in addition to the level of K in 'Fuji'.
Macieiras (Malus domestica Borkh.), cultivares Gala e Fuji, foram pulverizadas na plena floração com thidiazuron (TDZ) nas doses de 0, 5, 10 e 20 g ha-1 de ingrediente ativo com o objetivo de serem avaliadas quanto ao crescimento, florescimento, nutrição, frutificação e rendimento de frutos. A frutificação efetiva aumentou com a dose de TDZ na cultivar Gala, mas não na cultivar Fuji. Os tratamentos não afetaram o rendimento de frutos em nenhuma cultivar. Na cultivar Gala o florescimento no ano posterior ao da aplicação de TDZ foi reduzido em cerca de 50% nas doses de 10 e 20 g ha-1. O TDZ promoveu aumento no crescimento dos ramos do ano em ambas as cultivares. Nas folhas, o aumento nas doses de TDZ reduziu os teores de Ca e Mg na cultivar Gala, e de Mg na cultivar Fuji mas não afetou o conteúdo de clorofila, área, comprimento, diâmetro e massa seca cm-2 da folha, em ambas as cultivares. Em frutos inteiros (polpa + casca), o aumento nas doses de TDZ reduziu os teores de Ca e K na cultivar Gala, e os teores de K na cultivar Fuji. Na casca dos frutos, o aumento dos níveis de TDZ reduziu a concentração de N, Ca e Mg nas duas cultivares, além de K na cultivar Fuji.
Reference Key
amarante2002pesquisathidiazuron Use this key to autocite in the manuscript while using SciMatic Manuscript Manager or Thesis Manager
Authors ;Cassandro Vidal Talamini do Amarante;Paulo Roberto Ernani;Luiz Eduardo Bassay Blum;Clarice Aparecida Megguer
Journal proc - the fourth ieee workshop on software technol for future embedded and ubiquitous syst, seus 2006 andthe second int workshop on collaborative comput, integr, and assur, wccia 2006
Year 2002
DOI
10.1590/S0100-204X2002001000003
URL
http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-204X2002001000003
Keywords
pollination calcium malus domestica plant developmentagriculture (general)

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