http://localhost:8080/handle/123456789/2781 2026-04-18T14:14:32Z http://localhost:8080/handle/123456789/379 INFLUENCE OF WATER SUBMERGENCE STRESS AT EARLY STAGE ON THE GROWTH PATTERN & YIELD OF SOME INBRED AND HYBRID RICE VARIETIES NAHAR, RAFIUN 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). A Thesis Subinined to the Department oJ'.4gricu/tuml Botany S/icr-c-Bang/a Agricultural University.. D/iaka, in partial full/Intent oft/ic require/vents for the degree of MASTER OF SCIENCE IN AGRICULTURAL BOTANY SEMESTER: JANUARY-JUNE/2012 2012-06-01T00:00:00Z http://localhost:8080/handle/123456789/378 PERFORMANCE OF FIVE SELECTED HYBRID RICE VARIETIES IN BORO SEASON UDDIN, MD. SALAH The experiment was carried out at the research farm of the Sher-e-Bangla Agricultural University (SAU), Dhalca- 1207, during December 2011 to May 2012 to evaluate the performance of five hybrid rice varieties namely Moyna, Sonarbangla-3, IIeera4, Jagoron and Panna-!. The experiment was laid out in Randomized Complete Block design with four replications. Inbred BRRI dhan45 was used as a check variety. Growth characters yield and yield attributes were significantly different among the studied varieties. All the studied hybrid varieties exhibited superiority in respect of growth characters viz, tillers hill", leaves hilt'. TDM hilr1, leaf area hill", LA!, CUR, RGR and NAR over the inbred BRRI dhan45. Additionally, these hybrids also showed better performance in yield related characters viz, effective tillers hill", paniele length, 1000-grain weight, biological yield, harvest index (HI) over the same inbred. Consequently, the tested hybrid varieties produced the higher grain yield compared to BRRI dhan45. Higher grain yield of the tested hybrids also related with higher dry matter production and partitioning. However, Heera4 showed the best performance closely followed by Moyna. The hybrid varieties Heera-4 and Moyna had maximum CUR. RGR and NAR particularly in the reproductive stage (90 DAT) possibly for high sink demand and thus, these two varieties produced 43.5% higher yield over the inbred BRRI dhan45. Yield components, effective tillers hill" and 1000 grain weight mainly contributed to the higher grain yield of hybrid varieties over the inbred BRRI dhan-45. These results suggested that the tested hybrid rice varieties had yield advantage over the inbred BRRI dhan45 due to production and partitioning of more dry matter to the grain. )t rIhesis .S'ubmitted to the 'Faculty qfflgncuü ure, Sfier-e-'Bang&i4gricuftura(7)niversity, Dfialg, in partialfidfilment of the requirements for the agree of MASTER OF SCIENCE IN AGRICULTURAL BOTANY 2012-12-01T00:00:00Z