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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

Tecnologia de aplicação aérea de fungicidas na cultura do arroz irrigado / Technology aerial application of fungicides in irrigated rice

Silva, Tânia Maria Bayer da 16 March 2012 (has links)
Submitted by Gabriela Lopes (gmachadolopesufpel@gmail.com) on 2017-06-20T16:09:52Z No. of bitstreams: 2 license_rdf: 0 bytes, checksum: d41d8cd98f00b204e9800998ecf8427e (MD5) Tese Tânia Bayer.pdf: 909967 bytes, checksum: bb98b5908d8b1ee07585fe26d173015e (MD5) / Approved for entry into archive by Aline Batista (alinehb.ufpel@gmail.com) on 2017-06-21T18:55:52Z (GMT) No. of bitstreams: 2 Tese Tânia Bayer.pdf: 909967 bytes, checksum: bb98b5908d8b1ee07585fe26d173015e (MD5) license_rdf: 0 bytes, checksum: d41d8cd98f00b204e9800998ecf8427e (MD5) / Made available in DSpace on 2017-06-21T18:55:53Z (GMT). No. of bitstreams: 2 Tese Tânia Bayer.pdf: 909967 bytes, checksum: bb98b5908d8b1ee07585fe26d173015e (MD5) license_rdf: 0 bytes, checksum: d41d8cd98f00b204e9800998ecf8427e (MD5) Previous issue date: 2012-03-16 / Conselho Nacional de Pesquisa e Desenvolvimento Científico e Tecnológico - CNPq / Este trabalho teve por objetivo avaliar o efeito de equipamentos e taxas de aplicação, via aérea, no controle de doenças foliares e patógenos de grãos do arroz irrigado da cultivar Puitá Inta CL, com o fungicida Azoxistrobina 250g + Difenoconazol 250, além de verificar a densidade e penetração de gotas no dossel das plantas através de cartões hidrosensíveis. Avaliou-se a quantidade de fungicida depositado nos estratos superior e inferior através de análise cromatográfica e determinou-se a relação entre a área foliar e o peso dos estratos inferior e superior das plantas. As pulverizações foram realizadas com bico defletor Stol, bico hidráulico Travicar e atomizador rotativo de discos Turboaero, com volumes variando entre 10 e 30 L.ha-1 . A utilização de cartões hidronsensiveis possibilitou verificar que taxas de aplicação maiores proporcionaram maior densidade de gotas no estrato superior do dossel foliar e que todos os equipamentos, assim como as taxas de aplicação promovem similar penetração de gotas no dossel. Conclui-se que para estudar a distribuição de produtos químicos nos estratos inferior e superior das plantas via cromatografia, devem ser feitas extrações de porções vegetais com área foliar equivalente e não por quantidades com pesos iguais. Mesmo com pouca severidade de doença, a aplicação de fungicida mostrou-se importante no controle de fungos presentes nos grãos em pós-colheita, a exemplo de Fusarium sp. e Gerlachia sp.e dos patógenos Bipolaris sp. e Gerlachia sp. em condições de campo. / This study aimed to evaluate the effect of equipment and application rates, for the control of foliar diseases and pathogens of grains of rice cultivar Puitá CL Inta, with the fungicide azoxystrobin + difenoconazole, and check the density and penetration of drops in the canopy of plants with water sensitive papers. We evaluated the amount of fungicide deposited in the canopy by chromatographic analysis and determined the relationship between the leaf area and the weight of upper and lower layers of the plants. The products were sprayed with Stol deflector nozzle, Travicar hydraulic nozzle and rotative atomizer Turboaero, with volumes between 10 and 30 L.ha-1 . The use of water sensitive papers allowed to verify that higher application rates provided a higher density of droplets in the upper stratum of the canopy of leaves and that all equipment, as well as application rates similar to promote penetration of droplets into the canopy. It follows that to study the distribution of chemicals in the lower and upper layers of the plants via chromatography, can be made with the extraction of plant leaf area portions and not by amounts equivalent weight equal. Even with low disease severity, fungicide application was shown to be important in controlling fungi present in grain post-harvest, such as Fusarium sp. and Gerlachia sp., and the pathogens Bipolaris sp. and Gerlachia sp. at field conditions.

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