Qualidade de sementes de arroz irrigado, no colmo principal e perfilhos, em função de diferentes práticas agrícolas

Abstract

The irrigated rice (Oryza sativa L.) farming success it is directly related to the high quality seed production. The seed is an extremely important input, because the maximum potential of agricultural productivity is defined by its genetic pattern, so that all the other resources are explored and handled in function of that. The objective of this research was to evaluate the physiologic and physical quality of the seed produced in the main stems and in the irrigated rice tillers in different cultivatars and submitted to different agricultural practices. The experiment was accomplished in 2008/2009, at Experimental Station of Terras Baixas, Embrapa, located in Capão do Leão County RS.Itt was evaluated the cultivars: BRS Querência, BRS Firmeza, BRS Pelota and BRS Atalanta. The physiological quality was evaluated through the germination and vigor tests, besides, it was measured the weight of a thousand seeds and the whole grains income. It was tested the effects caused by the irrigation handling, chemical products treatments and plant structure factors where it were picked the seeds. The data were analyzed by the SAS statistical program (2001). In the seeds physiological quality it was verified that the germination was smaller in seeds produced by tillers in BRS Pelota cultivate. Otherwise, the hydric and chemist handle factors influenced this variable in BRS Atalanta and BRS Firmeza cultivars. Regarding the vigor just the hydric and chemist handlings influenced it in BRS Querência and BRS Atalanta cultivates. The main stem and affiliates seeds were different for the variable of a thousand seeds weight just to BRS Querência cultivar in chemicals absence and water laminates suppression. In BRS Firmeza cultivar this variable was influenced by the agricultural practices, while in BRS Atalanta and BRS Pelota cultivars they were only influenced by the chemical handling. The whole grains income was different between main stem and its tillers in BRS Atalanta in chemical absence and water laminates suppression. In BRS Querência and BRS Firmeza cultivars this variable was influenced by the agricultural practices, while to BRS Pelota cultivar it was only influenced by the chemical handling.