"Componentes do rendimento de grãos e potencial produtivo de genótipos de trigo (Triticum aestivum L.) em diferentes épocas de cultivo"

• Ano de defesa: 2017
• Autor(a) principal: Dalla Rosa, Danimar
• Orientador(a): Costa, Antonio Carlos Torres da
• Banca de defesa: Costa, Antonio Carlos Torres da, Oliveira, Paulo Sérgio Rabello de, Franco, Francisco de Assis
• Tipo de documento: Dissertação
• Tipo de acesso: Acesso aberto
• Idioma: por
• Instituição de defesa: Universidade Estadual do Oeste do Paraná; Marechal Cândido Rondon
• Programa de Pós-Graduação: Programa de Pós-Graduação em Agronomia
• País: Brasil
• Palavras-chave em Português: Produtividade; ganho genético; desempenho agronômico; fenótipo
• Palavras-chave em Inglês: Productivity; genetic gain; agronomic performance; phenotype
• Área do conhecimento CNPq: CIENCIAS AGRARIAS::AGRONOMIA
• Link de acesso: http://tede.unioeste.br:8080/tede/handle/tede/615

The objective of this work was to evaluate the components of grain yield and the productive potential of wheat genotypes at different growing seasons. The experimental design used was in radomized blocks with three replicates. Four identical experiments were implemented, referring to four sowing dates (31/03, 13/04, 27/04 e 08/05) in the year 2015, with 25 treatments (genotypes). It was evaluated the time in days of sowing to the gleaning and of the gleaning to physiological maturity, as well as the amount of day degrees accumulated for both periods, beyond plant height, number of spikes per square meter, spike size, number of spikelets per spike, number of grains per spike, grain quality and productivity. The data collected were evaluated by the joint analysis model of experiments. Sowing times of the last decennial of april (04/27) and first decennial of may (05/08), associated with low temperatures during the vegetative phase and high temperatures during the reproductive phase tend to lengthen and shorten these respective phases of development, reflecting higher yields. The genotypes 19 and 21 stood out for the longer period comprised of sowing to the gleaning and smaller period comprised of the gleaning to the physiological maturity. Genotype 5 shows low plant height, being able to be compared to the genotypes indicated for cultivation CD 150 and Toruk. The genotypes 8 and 13, although they do not show higher yields, stand out in front of the others because they have larger spikes and larger number of grains and spikelets per spike, deserving attention in future works. The genotype 17 stands out for the higher yield, being able to be equated to the indicated genotypes for cultive CD 150 and Toruk in some growing seasons and surpassing these in others. Grain quality is strongly influenced by the climatic conditions during the reproductive phase of the crop and has a high relation with grain yield.