Effects of depth of water on the behavior of lowland rice

Abstract

The objective of the present study was to determine the effects of six irrigation regimes on the behaviour of three cultivars and one selection of rice (Oryza sativa L.). Thus, tree cultivars (SML-5/65, IR-665-4-5-5, SUVALE-1-70 and Seleção-10) were submitted to water depths of 0,5, 10, 15, 20 and 25 cm. The parameters used to evaluate the responsive behavior of the rice cultivars above mentioned were the plant height number of tillers and panicles per hill, tillers fertility, number of spikelet and filled grains per panicle, spikelets perfility, weight of 1,000 grains and grain yield. The water depth did not produce any effect on the behavior of the rice, with exception of the number of filled grains, wieght of 1,000 grains and the fertility of spikelets.