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LIMA, Eduardo do Valle; CRUSCIOL, Carlos Alexandre Costa  and  MATEUS, Gustavo Pavan. Participation of main stem and tillers in irrigated rice yield at different seeding densities. Bragantia [online]. 2010, vol.69, n.2, pp.387-393. ISSN 0006-8705.

This study aimed to evaluate the participation of the main stem and tillers of cv. IAC 102 rice in grain productivity, under flood irrigation, as a function of seeding density. The experiment was conducted under a plastic tunnel at FCA/UNESP-Botucatu, São Paulo State, Brazil, in 500-L capacity asbestos cement-water tanks containing a 30 cm layer of a Typic Udifluvent soil. The experimental design was a completely randomized setup, with four replicates. Seeding densities were 100, 200, 300, 400, 500, and 600 viable seeds per m2, in four 1m-long rows per tank, spaced at 20 cm. Tillering decreased as seeding density increased, with greater participation of the main stems; however, this did not result in increased yield, due to the plasticity shown by rice plants, which yield components to adjust accordingly.

Keywords : Oryza sativa; yield components; flood-irrigated rice; physiology of production.

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