http://localhost:8080/handle/123456789/2100 2026-04-18T16:15:27Z http://localhost:8080/handle/123456789/2115 GENETIC VARIABILITY, CORRELATION AND PATH ANALYSIS IN TOSSA JUTE (Corchorus olitorius L.) GERMPLASM Islam, M. M.; Ali, N. M.; Bhuiyan, M.. S. R.; Rahman, M. M.; Yahiya, A. S. M. Genetic variability, correlation and path coefficient analysis for yield and yield attributing traits in 41 indigenous genotypes and three commercially cultivated varieties of tossa jute were studied at the Central .lute Agricultural Experiment Station, Manikganj of Bangladesh Jute Research Institute (B.1RI) during April to September 2007. Considering genetic parameters, high genotypic coefficient of variation and high heritability coupled with high genetic advance over mean were recorded for the characters- number of nodes per plant, green weight with leaves per plant, green weight without leaves per plant, stick weight per plant and fibre weight per plant suggesting better opportunity for selecting high valued genotypes based on these characters. Fibre yield per plant was significantly and positively correlated with green weight without leaves per plant and stick weight per plant at both genotypic and phenotypic levels. Path coefficient analysis indicated maximum direct contribution of stick weight per plant towards fibre yield followed by internode length, green weight without leaves per plant, plant height and green weight with leaves per plant. 2008-07-01T00:00:00Z http://localhost:8080/handle/123456789/2114 THE EFFECT OF SALINITY ON SEEDLING GROWTH OF DIFFERENT RICE GENOTYPES Razzaque, M. A.; Talukder, N. M.; Bhadra, A. K.; Islam, M. S. The effect of salinity-stress on seedling morphology of different rice genotypes along with one standard check salt tolerant rice cultivar Pokkali were assessed in two factors [30 rice genotypes in combination with 5 levels of salinity (0, 4, 8, 12 and 16 dS m")] Completely Randomized Design with three replications in pot culture. The results of this study indicated that the seedling height, root dry weight (RDW), shoot dry weight (SDW) and consequently the total dry mailer (TDM) significantly decreased with increasing salinity level irrespective of genotypes. The genotypes PYSB 19, Pokkali, PYSB9, PNR519, PNR381 produced higher relative-seedling height, RDW, SDW and TDM under different salinity levels. On the other hand, genotypes RD21, DM25 and NSI5 showed lower performance in relative-seedling height, RDW, SOW and TDM. Based on the effect of different salinity levels on seedling morphology, the genotypes PYSB9, PYSB 19, PNR519, PNR381 including the check Pokkali were designated as salt tolerant and RD21, DM25, NS 15 as salt susceptible. 2008-07-01T00:00:00Z http://localhost:8080/handle/123456789/2113 In Vitro PLANT REGENERATION FROM MESTA (Hibiscus sabdariffa L.) Roy, T. K.; Khatun, A.; Hossain, M. S.; Mondal, R. An experiment was conducted in the Genetic Engineering Laboratory of the Cytogenetics Department. Bangladesh .lute Research Institute (B.lRI), Dhaka. Cotyledons (with attached petioles) of mesta (Hibiscus snbdnrifJa L.) were used as explant to investigate its in vitro regeneration potentiality. Seed germination percentage was found to be better on clinical cotton supported MS liquid medium (90%) compared to agarsupported MS solidified medium (81.33%). Among the combinations, MS medium supplemented by BAP (2.0 mgll) and IAA (0.5 mgl1) showed the highest (58.33%) shoot regeneration. Shoot regeneration was not observed in MS media without hormone (MSO) and also when more than 4mglL BAP with 0.5 rng/l IAA combination was used. MS medium without hormone (MSO) showed good response for root formation from regenerated shoots of mesta and root development occurred very nicely. The regenerated plantlets of mesta subsequently survived in soil. 2008-07-01T00:00:00Z http://localhost:8080/handle/123456789/2112 ECONOMIC CULTIVATION OF TRANSPLANT AMAN RICE UNDER DIFFERENT WEED MANAGEMENT TECHNIQUES AND PLANT SPACING Ali, M.; Sardar, M. S. A.; Biswas, P. K. An experiment was carried out at the Agronomy field. Sher-e-Bangia Agricultural University. Dhaka during the period from July to December. 2006 to evaluate the economic cultivation of transplant arnan rice under different weed management techniques and plant spacing. The experiment comprised six weeding treatments viz, no weeding. two hand weeding at IS and 40 days after transplanting (DAT). one weeding with BRRI push weeder at IS DAT + one hand weeding at 40 DAT. pre-emergence application of M.Chlor 5G (Butachlor) at 5 DAT + one hand weeding at 40 DAT, pre-emergence application of Oxastar 25 EC (Oxadiazon) at 5 DAT + one hand weeding at 40 DAT. pre- emergence application of Rifit 500EC (Pretilachlor) at 5 DAT + one hand weeding at 40 DAT and three plant spacings viz. 20cm x l Ocrn, 25cm x 15cm and 30cm x 20cm. Twelve weed species belonging to seven families were found in the experimental field of which Sphenoc/ea zeylanica. Eclipta alba and Ludwigia octovalvis were the most dominating weed species in transplanted aman rice. The overall performance of use of Pretilachlor at the spacing of 25cm x 15cm was found to be the best and it produced the highest grain yield (3.87 t ha"), highest net profit (23847.00 Tk ha") and highest BCR (1.79) that followed by BRRI push weeder + one hand weeding at the spacing of 30cm x 20cm. 2008-07-01T00:00:00Z