Arranjos de semeadura e desempenho de híbridos de arroz

• Autor(a) principal: Goulart, Eduardo da Silveira
• Data de Publicação: 2012
• Tipo de documento: Dissertação
• Idioma: por
• Título da fonte: Repositório Institucional da UFPel - Guaiaca
• Texto Completo: http://repositorio.ufpel.edu.br/handle/ri/1385
• topic: Arroz irrigado; Oryza sativa L.; Densidade; Espaçamento entre linhas; Híbridos de arroz; Irrigated rice; Oryza sativa L.; Density; Row spacing; Hybrid rice; CNPQ::CIENCIAS AGRARIAS::AGRONOMIA::FITOTECNIA::PRODUCAO E BENEFICIAMENTO DE SEMENTES

The practices and techniques used in irrigated rice to obtain better performances include the optimal density and the best arrangement of plants in the area. This study aims to evaluate the behavior and plasticity in the yield and grain quality of three rice hybrids with different sowing arrangements in the density and row spacing. The experimental field was conducted in rice season 2010/2011 in Capão do Leão, Viamão and Uruguaiana at Rio Grande do Sul state. Three different sowing arrangements, involving row spacing with 17 cm, 34 cm and 17cm intercalated with 34 cm which corresponded respectively to densities of 40 kg.ha-1, 20 kg.ha-1 and 32 kg.ha-1. The experimental design used was randomized blocks with sub divided plots with three replications considering each location as a replication. Were evaluated the yield and grain quality. The results show that the grain yield and grain quality components of hybrid rice were not affected by sowing arrangement. The hybrids behavior demonstrates the plasticity to compensate lower densities and different distance between planting rows. This allow recommendations of seeding rates and row spacing for these hybrids reducing the amount of seed to be sown per area compared with what is currently recommended. It means cost reduction and can make the use of this technology more attractive and widely used in commercial rice fields.