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  • About
  • The Global ETD Search service is a free service for researchers to find electronic theses and dissertations. This service is provided by the Networked Digital Library of Theses and Dissertations.
    Our metadata is collected from universities around the world. If you manage a university/consortium/country archive and want to be added, details can be found on the NDLTD website.
1

Porta-enxertos para a cultura da pereira tipo européia / Rootstocks for the culture of the European pear tree type

Giacobbo, Clevison Luiz 03 March 2008 (has links)
Made available in DSpace on 2014-08-20T13:25:40Z (GMT). No. of bitstreams: 1 TESE_Clevison_Luiz_Giacobbo.pdf: 474996 bytes, checksum: 586f90f29fc5d4023559b48cfd345ae9 (MD5) Previous issue date: 2008-03-03 / This study was developed with the objectives of evaluating different rootstocks grafted on european pear, cultivars Conference, William's Bon Chrétien and Packham's Triumph; the development of cv. Doyenné Du Comice under different hydric conditions; and the grafting compatibility of the cvs. Cascatense, Carrick and Seleta. In a total of four separated experiments, two of them were carried out in the Pisa University, in Italy, at the experimental orchard of the Facoltà di Agraria, during the 2003 growth season. The experiment 1 was done with the objective to evaluate different rootstocks cultivars for the culture of the pear tree, grafted with the cv. Conference. The aim of the second experiment was to evaluate the effect of the rootstock and different soil hydric conditions on the vegetate-productive behavior of pear tree. The remaining experiments were carried out in the Federal University of Pelotas, Brazil, at the Agricultural Center of Palma. The experiment 3 aimed in verifying the compatibility degree among the rootstock of quince cv. EMC and the Cascatense, Carrick and Seleta cultivars. The experiments 4 evaluated, agronomical the effect of several quince rootstocks and Pyrus calleryana on the growth and development of pear trees. Regarding the vegetative development and productivity, it was verified that the clonal pear rootstocks were normally greater than quince rootstocks. In general, pear and quince rootstocks have provided a good fruit production. When grafted on Carrick e Seleta cultivars, the quince rootstock EMC induced a reduced plant xvi size and smaller production accumulated, besides promoted a larger productive efficiency and good initial compatibility. The most significant fruit enlargement was verified in the final period of fruit development and was greater in irrigated rootstocks. The irrigation also provided larger fluctuation of the plant trunk diameter. Quince rootstocks have presented more sensitivity to hydric stress than the rootstock of Pyrus spp. Plants grafted on irrigated quince presented the highest gaseous changes and estimated productivity. / Este trabalho foi realizado com o objetivo de avaliar diferentes porta-enxertos para pereiras tipo européias, cultivares Conference, William's Bon Chrétien e Packham s Triumph; diferentes condições hídricas para a cv. Doyenné Du Comice; compatibilidade de enxertia do marmeleiro EMC com as cvs. Cascatense, Carrick e Seleta. Foram realizados quatro experimentos, sendo dois na Università degli Studi di Pisa, Itália, no campo experimental da facoltà di Agrária, safra de 2003 e dois realizados na Universidade Federal de Pelotas, Brasil, no Centro Agropecuário da Palma da Faculdade de Agronomia Eliseu Maciel, Capão do Leão/RS, período de 2002-2005. O experimento 1; realizado na Itália, constou de diferentes cultivares porta-enxertos com a cv. Conference. O experimento 2; também realizado na Itália, observou-se o comportamento vegeto-produtivo de pereira cv. Doyenné Du Comice sobre diferentes portaenxertos e regime hídrico. No Brasil objetivou-se no experimento 3: verificar o grau de compatibilidade entre o porta-enxerto de marmeleiro cv. EMC e as cvs. de pereira Cascatense, Carrick e Seleta e experimento 4; avaliar agronomicamente diferentes porta-enxertos de marmeleiro e Pyrus calleryana, no crescimento e desenvolvimento de plantas de pereira. Verificou-se com relação ao desenvolvimento vegetativo que, os porta-enxertos originários de pereira (clonal) foram, em geral, superiores em relação aos marmeleiros e com xiv relação ao aspecto produtivo, observou-se que tanto porta-enxertos oriundos de pereira como de marmeleiro, possibilitam boa produção às plantas. O portaenxerto cv. EMC propiciou, além de, plantas mais baixas e menor produção acumulada, maior eficiência produtiva e boa compatibilidade inicial com as cvs. Carrick e Seleta. Na comparação entre os porta-enxertos de marmeleiro e pereira, relacionado a regime hídrico, verificou-se que houve maior crescimento de frutas no período final, nos porta-enxertos irrigados, os quais apresentaram ainda, maior flutuação do diâmetro do tronco. Plantas enxertadas sobre marmeleiro irrigado, apresentaram maiores trocas gasosas e produtividade estimada, porém porta-enxertos de marmeleiro apresentaram-se mais sensíveis a estresse hídrico do que porta-enxertos de Pyrus spp..

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