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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

Perdas de rendimento do girassol devidas ao ataque de pássaros / Loss of sunflower yield due to birds attack

Siqueira, Patricia Liany de Oliveira Fernandes 07 March 2017 (has links)
Submitted by Socorro Pontes (socorrop@ufersa.edu.br) on 2017-12-18T14:51:21Z No. of bitstreams: 1 PatriciaLOFS_TESE.pdf: 911916 bytes, checksum: 22ea6690bfd6603de358c9ad1e11add3 (MD5) / Rejected by Socorro Pontes (socorrop@ufersa.edu.br), reason: corrigir referencia on 2017-12-22T13:46:40Z (GMT) / Submitted by Socorro Pontes (socorrop@ufersa.edu.br) on 2017-12-22T13:47:23Z No. of bitstreams: 1 PatriciaLOFS_TESE.pdf: 911916 bytes, checksum: 22ea6690bfd6603de358c9ad1e11add3 (MD5) / Approved for entry into archive by Vanessa Christiane (referencia@ufersa.edu.br) on 2018-02-20T14:29:45Z (GMT) No. of bitstreams: 1 PatriciaLOFS_TESE.pdf: 911916 bytes, checksum: 22ea6690bfd6603de358c9ad1e11add3 (MD5) / Made available in DSpace on 2018-02-20T14:29:56Z (GMT). No. of bitstreams: 1 PatriciaLOFS_TESE.pdf: 911916 bytes, checksum: 22ea6690bfd6603de358c9ad1e11add3 (MD5) Previous issue date: 2017-03-07 / Fundação de Apoio à Pesquisa do RN / Sunflower damage caused by bird attacks occur in the major producing regions of the world, making birds important pest of the sunflower crop.The objective of the present work was to estimate yield, yield losses due to bird attack and phenotypic correlations between characters of sunflower cultivars and to estimate the direct and indirect effects of the main character yield and percentage of yield loss with the other characteristics. The experimental design was a randomized block design with five replicates. Grain yield, number of grains and the 1000 seeds were assessed in subdivided parcels where the cultivars were assigned parcels and the protection of capitulum to the attack of birds (with and without cover) were assigned to subplots. The other evaluated characteristics were analyzed in a simple DBC. There was interaction cultivar x bird attack. The cultivars Neon 15 and Olisun showed higher grain yields in the covered plots and Neon 15 cultivars and aguará 05 had higher yield in the plots without coverage. The cultivars Aguará 05 and CF 101 were less attacked and probably more resistant to bird attack. The reduction caused by bird attack was approximately 631.6 kg ha-1, estimating a 25% loss in grain yield. The most affected cultivars with the highest loss percentage were Hélio 253 and Hélio 358. The characteristics stem diameter, plant height, capitulum diameter, number of grains per capitulum, initial and full flowering showed a positive direct effect on the yield of grains (with cover) and the characteristic mass of 1000 grains presented positive correlation with% loss. The cock of the meadow was the bird species that occurred as a pest in the experimental area / Danos a girassol causados por ataque de pássaros ocorrem nas principais regiões produtoras do mundo, tornando as aves importantes pragas-chave da cultura do girassol. O objetivo do presente trabalho foi estimar o rendimento, as perdas de rendimento devidas ao ataque de pássaros e as correlações fenotípicas entre caracteres dos cultivares de girassol e estimar os efeitos diretos e indiretos sobre o caráter principal rendimento e % perda de rendimento de outras características avaliadas. O delineamento experimental usado foi de blocos ao acaso com cinco repetições. O rendimento de grãos, o número de grãos e a massa de 1000 grãos foram avaliadaos em parcelas subdividas, onde os cultivares foram atribuídos às parcelas e a proteção dos capítulos ao ataque dos pássaros (com e sem cobertura) foram atribuídas às subparcelas. As demais características avaliadas foram analisadas em um DBC simples. Houve interação cultivar x ataque de pássaros. Os cultivares Neon 15 e Olisun apresentaram maiores rendimentos de grãos nas parcelas com cobertura e os cultivares Neon 15 e aguará 05 apresentaram maiores rendimentos nas parcelas sem cobertura. Os cultivares Aguará 05 e CF 101 foram menos atacados e provavelmente mais resistentes ao ataque de pássaros. A redução causada pelo ataque de pássaros foi de aproximadamente 631,6 kg ha-1, estimando perda de 25% no rendimento de grãos. Os cultivares mais atacados e com maior porcentagem de perda foram Hélio 253 e Hélio 358. As características diâmetro da haste, altura de planta, diâmetro do capítulo, número de grãos por capítulo, floração incial e plena apresentaram efeito direto positivo sobre o rendimento de grãos (com cobertura) e a massa de 1000 grãos apresentou correlação positiva com % de perda. O galo da campina foi a espécie de pássaro ocorrente como praga na área experimental / 2017-12-04

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