INFLUENCE OF WATER SUBMERGENCE STRESS AT EARLY STAGE ON THE GROWTH PATTERN & YIELD OF SOME INBRED AND HYBRID RICE VARIETIES

Abstract

The experiment was conducted during the period from June to December. 2012 in T. amczn season to find out the influence of water submergence stress on the growth pattern & yield of some hybrid rice varieties. Four submergence duration, viz.. Control (no submergence). Six days submergence. len days submergence and Fourteen days submergence and six varieties, viz.. BRRI dhan 51. BRRI dhan 46, BRRI dhan 34. I3RRJ hybrid 4, Patina- I . Taj - I were used to conduct this experiment. The experiment was laid out in Randomized Complete Block Design (RCI31)) having two factors and replicated three times. All parameter were signilieantly aflèeted by the interaction between submergence and variety. The tallest plant was recorded from lourteen days submergence trcatment.The highest number of leaves, number of tillers hill''. number ofelleetive tillers hill', and number of tilled grains paniele'. weight of 1000 grains were recorded from no submergence treatment. The highest grain vieW was ihund ti'oni control (110 submergence) treatments. 'the Patina- I variety produced the tallest plant and highest number of leaves. The I3RRI dhan 51 achieved the highest number oltillers hill". number of eiketive tillers lull'. highest iituiiber of grains panic Ic'' and I 000-grai ii weight. 'I he BR It I I nbrid dhan 4 produced the highest 7.1$ t ha" grain yield. Signiiieantly the highest (8.00 t ha") grain yield was found from the treatment combination of no submergence with 13RR!hybrid dhan 4 and the lowest (1.10 t ha' ) troll) fourteen days submergence with BRRI dhan 34. Among the varieties RRRI dhan 51 is treated as submergence tolerant. in comparison to this Panna I and BRRI dhan 34 was found to he susceptible. BRRI dhan 46 and Tuj I was sonic what tolerant and BRRI hybrid 4 provided some what good yield in submergence conditon. The tested genotypes showed wide variation in yield with I3RRI dhan 51 (tolerant)> 'l'aj-1 > 13RR1 dhan 46> 131ZR1 hybrid cllian 4-> -  Panna - I> 131(1(1 Jhztn 34(susccptihle).