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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

Interferência de plantas daninhas na cultura do milho cultivado em segunda safra com dois espaçamentos / Weed interference in corn crop grown in short season on two spacings

Silva, Janaína de Assis 14 July 2017 (has links)
Submitted by Luciana Ferreira (lucgeral@gmail.com) on 2017-08-15T12:16:42Z No. of bitstreams: 2 Dissertação - Janaína de Assis Silva - 2017.pdf: 1125529 bytes, checksum: db2bd96979a55f5960d44d645ef02e20 (MD5) license_rdf: 0 bytes, checksum: d41d8cd98f00b204e9800998ecf8427e (MD5) / Approved for entry into archive by Luciana Ferreira (lucgeral@gmail.com) on 2017-08-15T12:17:12Z (GMT) No. of bitstreams: 2 Dissertação - Janaína de Assis Silva - 2017.pdf: 1125529 bytes, checksum: db2bd96979a55f5960d44d645ef02e20 (MD5) license_rdf: 0 bytes, checksum: d41d8cd98f00b204e9800998ecf8427e (MD5) / Made available in DSpace on 2017-08-15T12:17:12Z (GMT). No. of bitstreams: 2 Dissertação - Janaína de Assis Silva - 2017.pdf: 1125529 bytes, checksum: db2bd96979a55f5960d44d645ef02e20 (MD5) license_rdf: 0 bytes, checksum: d41d8cd98f00b204e9800998ecf8427e (MD5) Previous issue date: 2017-07-14 / The objective of this study was to evaluate the interference of weeds in corn crop, cultivated on two spacings, under no-tillage system, in order to determine the periods of infesting community interference. The trial was conducted at Federal University of Goiás, Regional Jataí. The experimental design was randomized blocks in a split-split plot design with three replications. The row spacings of plots were (0.45 and 0.90 m). The subplots were coexistence groups (with and without bush) and the split-split plots were seven periods of coexistence or control of the weed community (0, 10, 20, 30, 40, 60 and 120 DAE). Weed control was performed by manual weeding. The weed community was evaluated by density and floristic composition. Plant height, cob insertion height, cob diameter, cob length, number of rows per cob, number of grains per row and grain yield were evaluated. In corn plants, it was verified that there coexistence with weeds was significant difference for cob insertion height, cob length and number of rows per cob. The 0.90 m row spacing provided a longer cob length. Interference periods (PAI, PCPI, PTPI) were not possibel determined for Feroz Vip at short season under two spacings / Objetivou-se avaliar a interferência das plantas daninhas na cultura do milho, cultivado em segunda safra com dois espaçamentos, sob sistema de plantio direto, a fim de determinar os períodos de interferência da comunidade infestante sobre a cultura. A pesquisa foi conduzida na Universidade Federal de Goiás, Regional Jataí. O delineamento experimental adotado foi o de blocos ao acaso em esquema de parcelas subsubdivididas com três repetições. As parcelas foram compostas pelos espaçamentos (0,45 e 0,90 m). As subparcelas pelos grupos de convivência (Com e Sem Mato) e as subsubparcelas por sete períodos de capina manual da comunidade infestante (0, 10, 20, 30, 40, 60 e 120 DAE). A comunidade infestante foi avaliada por meio da densidade e composição florística. Avaliou-se altura de plantas, altura de inserção de espiga, diâmetro de espiga, comprimento de espiga, número de fileiras de grãos por espiga, número de grãos por fileira e produtividade de grãos. Na pesquisa foi verificado que a convivência com as plantas daninhas interferiu de forma negativa a altura de inserção de espiga e o número de fileiras por espiga. O espaçamento 0,90 m proporcionou maior comprimento de espiga. Não foi possível determinar os períodos de interferência (PAI, PTPI, PCPI) para o híbrido Feroz Vip cultivado no período de segunda safra sob dois espaçamentos.

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