EFFECT OF SUBMERGENCE AT VEGETATIVE PHASE ON MORPHOLOGICAL ATTRIBUTES AND YIELD OF SOME RICE VARIETIES

Abstract

ilie experiment was conducted during June to December, 2011 in T. Aman season to observe etièct of submergence at vegetative phase on the morphological attributes and yield of some rice varieties. Four submergence duration, viz., Control (no submergence), Six days submergence. Ten days submergence and Fourteen days submergence and six varieties, viz.. BRRI dhan5l. BRRI dhan46. BRRI dhan34. BRRI hybrid dhanl, BRRI hybrid dhan2. ACI tiybridl were used for this experiment. The experiment was laid out in Split Plot Design with three replications. All parameters were significantly affected by the submergence duration and variety. The tallest plant was recorded from fourteen days submergence treatment. The highest number of leaves, number of tillers hilr'. and number of grains panicle", weight of 1000 grains were recorded from no submergence. The highest grain yield was found from no submergence (control). The tallest plant was observed in BRRI hybrid dhan2. The highest number of leaves, number of tiller hill", number grains panicle" and 1000-grain weight were achieved in BRRI dhan5l. The BRRI hybrid dhanl produced the highest (7.83 t ha") grain yield. The highest (8.50 t ha") grain yield was found from BRRI hybrid dhanl with no submergence (control) and the lowest (1.20 t ha") from BRRI dhan34 with fourteen days submergence. The test genotypes showed wide variation in yield reduction at different submergence duration. BRRI dhan5 I followed by BRRI hybrid dhanl showed lower grain yield reduction % in submerged conditions compare to control by attaining good yield contributing characters and thus proved as tolerant varieties. On the other hand, BRRI dhan34 and AC1 hybridl were susceptible to submergence.