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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

Uso de piraclostrobina em híbridos simples de milho no cerrado / Use of pyraclostrobin in simple hybrid of cornin cerrado

Schumacher, Pedro Vitor 05 February 2015 (has links)
Submitted by Cláudia Bueno (claudiamoura18@gmail.com) on 2016-03-28T19:14:35Z No. of bitstreams: 2 Dissertação - Pedro Vitor Schumacher - 2015.pdf: 575346 bytes, checksum: 2fab7b48cdd75f80b00067b7ea63792b (MD5) license_rdf: 23148 bytes, checksum: 9da0b6dfac957114c6a7714714b86306 (MD5) / Approved for entry into archive by Luciana Ferreira (lucgeral@gmail.com) on 2016-03-29T15:03:00Z (GMT) No. of bitstreams: 2 Dissertação - Pedro Vitor Schumacher - 2015.pdf: 575346 bytes, checksum: 2fab7b48cdd75f80b00067b7ea63792b (MD5) license_rdf: 23148 bytes, checksum: 9da0b6dfac957114c6a7714714b86306 (MD5) / Made available in DSpace on 2016-03-29T15:03:00Z (GMT). No. of bitstreams: 2 Dissertação - Pedro Vitor Schumacher - 2015.pdf: 575346 bytes, checksum: 2fab7b48cdd75f80b00067b7ea63792b (MD5) license_rdf: 23148 bytes, checksum: 9da0b6dfac957114c6a7714714b86306 (MD5) Previous issue date: 2015-02-05 / Coordenação de Aperfeiçoamento de Pessoal de Nível Superior - CAPES / Two experiments were undertaken aiming to evaluate the effects of the pyraclostrobin fungicide applied at different times and combinations on two simple corn hybrids in the first and second harvests at the Cerrado. The first experiment was undertaken during the 2013/14 harvest adopting a randomized block design in a factorial 2 x 9 (hybrid x pyraclostrobin applications), having four replications. The applications were performed in different combinations: presence or absence of pyraclostrobin + thiophanate methyl + fipronil (100g a.i. 100kg seed-1) in seed treatment (V0) combined with pyraclostrobin (150g a.i. ha-1) application before or after topdressing (V4 or V6) combined or not with pyraclostrobin + cyproconazole (137.25g a.i. ha-1) application in pre-bolting (VT) and a control (on which pyraclostrobin wasn’t used). The second experiment was undertaken during the second harvest of the year 2014, adopting a randomized block design in a factorial 2 x 8 (hybrid x pyraclostrobin applications), having four replications. The applications were performed as doses of 0, 150, 300 and 600g i.a. ha-1 in V6, combined or not with the application of pyraclostrobin + cyproconazole as a dose of 137.25g i.a. ha-1 in pre-bolting (VT). An F test was performed over the collected data to analyze the significance and a Tukey test was performed to compare the means, both tests being run at a 5% probability. No effects of the application of pyraclostrobinwere observed in the first experiment, as well as no interactions among the analyzed factors. In the second experiment the application of pyraclostrobin affected the chlorophyll content positively during the reproductive stage and also affected positively the leaf senescence. In spite of the beneficial effects of the usage of pyraclostrobin on some characters there was no production increase in any of the two simple corn hybrids in the first and second harvests at the Cerrado. / Objetivando-se avaliar o efeito do fungicida piraclostrobina aplicado em diferentes épocas e combinações sobre dois híbridos simples de milho cultivados em primeira e segunda safra no Cerrado conduziu-se dois experimentos. O primeiro durante a safra 2013/14 empregando-se o delineamento de blocos ao acaso no esquema fatorial 2 x 9 (híbridos x aplicações de piraclostrobina), com quatro repetições.As aplicações foram realizadas em diferentes combinações: presença ou ausência de piraclostrobina + tiofanato metílico + fipronil (100 g i.a. 100 kg semente-1) no tratamento de sementes (V0), combinado com a aplicação de piraclostrobina (150 g i.a.ha-1) antes ou após a adubação de cobertura (V4 ou V6), combinado ou não com a aplicação de piraclostrobina + ciproconazole (137,25 g i.a.ha-1) em pré-pendoamento (VT) e uma testemunha (sem uso de piraclostrobina). O segundo experimento foi conduzido durante a segunda safra no ano de 2014, empregando-se o delineamento de blocos ao acaso no esquema fatorial 2 x 8 (híbridos x aplicações de piraclostrobina), com quatro repetições. As aplicações foram realizadas nas doses de 0, 150, 300 e 600 g i.a. ha-1 em V6, combinadas ou não com a aplicação de piraclostrobina + ciproconazole na dose 137,25 g i.a. ha-1 em pré-pendoamento (VT).Os dados coletados foram submetidos ao teste F para verificação de significância eas médias comparadas pelo teste de Tukey, ambos a 5% de probabilidade. No primeiro experimento não foi observado efeito das aplicações de piraclostrobina e nem interação entre os fatores analisados. No segundo experimento a aplicação de piraclostrobina afetou o índice de clorofila de forma positiva no estádio reprodutivo e a senescência foliar de forma positiva. Apesar do efeito benéficodo uso de piraclostrobina sobre alguns caracteresnão houve incremento de produtividade de grãos dos dois híbridos simples de milho cultivados em primeira e segunda safra no Cerrado.

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