2008, July (Vol. 2, No. 2)
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Item GENETIC VARIABILITY, CORRELATION AND PATH ANALYSIS IN TOSSA JUTE (Corchorus olitorius L.) GERMPLASM(Sher-e-Bangla Agricultural University Research System (SAURES), Dhaka, Bangladesh, 2008-07) 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.Item THE EFFECT OF SALINITY ON SEEDLING GROWTH OF DIFFERENT RICE GENOTYPES(Sher-e-Bangla Agricultural University Research System (SAURES), Dhaka, Bangladesh, 2008-07) 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.Item In Vitro PLANT REGENERATION FROM MESTA (Hibiscus sabdariffa L.)(Sher-e-Bangla Agricultural University Research System (SAURES), Dhaka, Bangladesh, 2008-07) 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.Item ECONOMIC CULTIVATION OF TRANSPLANT AMAN RICE UNDER DIFFERENT WEED MANAGEMENT TECHNIQUES AND PLANT SPACING(Sher-e-Bangla Agricultural University Research System (SAURES), Dhaka, Bangladesh, 2008-07) 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.Item EFFECT OF PHOSPHORUS ON GROWTH, YIELD AND SHELF LIFE OF BROCCOLI (Brassica oleracea var. botrytis) CUL TIV AR(Sher-e-Bangla Agricultural University Research System (SAURES), Dhaka, Bangladesh, 2008-07) Uddain, J.; Rahman, M. J.; Uddin, A. K. M. M.The field and laboratory experiments were conducted at Horticultural farm of Sher-e-Bangia Agricultural University. Dhaka during the period trorn October 2005 to February 2006 to study the effect of phosphorus on growth, yield and shelf lite of broccoli cultivars. Four levels of phosphorus fertilizers viz. Po=O kg Plha, P, = 30 kg Plha, P2 = 40 kg Plha and PJ =50 kg Plha were used in the field experiment. The tield experiment was laid out in Randomized Complete Block Design with three replications. Considering the yield and yield atributes of broccoli the highest plant height (55.85 ern), stem diameter (5.69 cm), number of leaves (13.78), leaf length (45.97 ern) at 60 DAT, shoot length (39.93 ern), root length (30.8Icm), fresh shoot weight (793.9 g), fresh root weight (83.42 g) and main curd weight (264.3 g) and curd yield (13.81 tlha) were recorded from P,. But the highest curd diameter (17.44 em), number of secondary curd (4.25). weight of secondary curd (155.3 g) was found in P,. The laboratory experiment was laid out in two factors Completely Randomized Design with four levels of phosphorus fertilizers viz. Po=0 kg Plha, P, = 30 kg Plha, P, = 40 kg Plha and P, =50 kg Plha and three storage conditions. The storage conditions were as follows: i. stored in open condition at room temperature (24°('), ii. stored in perforated polythene bags at room temperature (24°C) and iii. stored in perforated polythene bags at 4°(' in refrigerator. The maximum shelf life of broccoli in open at room temperature (2.62), polyethylene bag at room temperature (6.02) and polyethylene bag at refrigerator (17.0 I) were found in Po.Item EF.FECT OF SALINITY ON MINERAL CONTENT IN DIFFERENT PLANT PARTS OF RICE GENOTYPES(Sher-e-Bangla Agricultural University Research System (SAURES), Dhaka, Bangladesh, 2008-07) Razzaquc, M. A.; Talukder, N. M.; Islam, M. S.; Bhadra, A. K.The effect of salinity on mineral content in stem, leaf sheath, leaf blade and grain of rice genotypes differing in salt tolerant (The genotypes PVSBI9, PVSB9. PNR519. PNR381. Iratom24 and Pokkali representing salt tolerant and NS 15 representing salt-sensitive) were studied in an experiment conducted in two factors Completely Randomized Design. The susceptible genotype NS 15 showed higher concentration of Na', Cl, Ca" and Mg ' and lower amount of K' in stem, leaf sheath and leaf blade of rice compared to tolerant ones. The concentration of Na', Ca". Mg" and Cl followed an increasing pattern in different plant parts of all the selected rice genotypes due to increasing salinity levels except Cal+ and Mgl' in grain, where these two ions decreased with increasing salinity levels. But the concentration of K' showed decreasing pattern in stem, leaf sheath, leaf blade and grain with increasing salinity levels. In different plant parts, the Na+ and cr content increased very sharply and K' decreased very rapidly in susceptible genotype as compared to other genotypes. The highest amount of Na+ and K' were obtained in stem followed by leaf sheath, leaf blade and grain at different salinity levels. But the content of Cal+, MgH and CT were high in leaf blade followed by leaf sheath and stem at different levels of salinity.Item EFFECT OF DU'FERENT SOURCES OF JUTE (Corchorus capsularis L.) SEEDS ON GERMINATION, VIGOUR AND EMERGENCE ATTRIBUTES(Sher-e-Bangla Agricultural University Research System (SAURES), Dhaka, Bangladesh, 2008-07) Islam, M. M.; Sarkar, M. A. R.; Akter, N.; Moniruzzaman, S. M.; Alamglr, M. A.A series of experiments were conducted to assess the germination, vigour and emergence of jute seeds collected from live different sources of Bangladesh. The seed germination and vigour estimation experiments were laid out at the Agronomy laboratory, Bangladesh Jute Research Institute (BJRI), Dhaka in completely randomized design with four replications and the emergence experiments were conducted at greenhouse of B.JRI, Dhaka and field of Jute Agriculture Experimental Station (.IAES), Manikganj in randomized complete block design with four replications during March to .June 2004. The treatments consisted of five different seed sources viz., i) Bangladesh Jute Research Institute (B.lRI), ii) Bangladesh Agricultural Development Corporation (BADC), iii) Farmers of Manikgonj. iv) Farmers of Kishoregonj and v) Local market. The variety CVL- I of the Corchorus capsularis L. was used as study material. The results revealed that the germination. vigour index and coefficient of germination of CVL-I varied significantly due to seed sources. Germination, vigour, co-efficient of germination observed better in B.lRI seeds toll owed by BADe. Emergence, survivability and relative field emergence varied significantly for seed sources. BJRI seeds performed better in these respects while grown under greenhouse and field conditions. Significantly positive correlations were observed among germination, vigour index and emergence.Item VARIABILITY STUDY IN F2 PROGENIES OF THE INTER-VARIETAL CROSSES OF Brassica rapa(Sher-e-Bangla Agricultural University Research System (SAURES), Dhaka, Bangladesh, 2008-07) Parveen, S.; Bhuiyan, M. S. R.; Hossain, M. S.; Rashid, M. H.An experiment was carried out by using the F, population of 12 inter-varietal crosses. including reciprocals, of the species Brassica rapa for estimating the magnitude of variations in characters. heritability and genetic advance. There were significant variations among different F, materials used in the experiment. Genetic parameters viz. number of primary branches/plant, number of secondary branches/plant. length of siliqua, number of seeds/siliqua. days to 50% flowering, 1000 seed weight and yield/plant showed least difference between genotypic and phenotypic variance. Plant height, length of siliqua, number of seeds/siliqua and days to 50% tlowering showed low genotypic and phenotypic co-efficient of variation. Number of primary branches/plant and secondary branches/plant showed high heritability coupled with high genetic advance and very high genetic advance in percentage of mean. However, the yield/plant, days to maturity and length of siliqua showed low heritability. Based on the variability study, some promising F, plants showing high heritability for yield contributing characters were selected from some of the cross combinations of the inter-varietal crosses of Brassica rapa for advancing the generations.Item EFFECT OF SEED TREATMENT WITH SOME BOTANICALS ON SEEDLING GROWTH AND SEVERITY OF BIPOLARIS LEAF BLIGHT (Bipolaris sorokiniana) OF WHEAT(Sher-e-Bangla Agricultural University Research System (SAURES), Dhaka, Bangladesh, 2008-07) Rahmani, M. M.; Islam, M. A.; Aminuzzaman, F. M.; Islam, M. R.An experiment was conducted to find out the effect of 13 botanicals on seedling growth and severity of Bipolaris leaf blight (Bipolaris sorokinianov of wheat in a net house of Sher-e-Bangia Agricultural University, Dhaka, Bangladesh during November 2006 to March 2007. It was found that seed treatment with Allium cepa, A. sativum, Curcuma longa, Aegle marmelos, Lawsonia alba. Allamanda cathanica extracts caused considerable increase in germination and seedling growth. Pre-sowing treatment of seeds with all of the plant extracts caused significant reduction in disease severity over control. The severity index values under control were 1.55.2.00.3.22.4.55,4.66 and 4.66, respectively at flag leaf. booting, panicle initiation, !lowering, milk and hard dough stages of wheat plants. Seed treatment with the materials reduced disease severity within the range of 0.33-1.22,0.99-1.77. 1.11-2.00. 1.22-2.22. 1.66- 3.00 and 200-3.83. respectively for the above mentioned growth stronges of the crop.Item EFFECT OF WATE RING INTERVALS ON THE YIELD AND YIELD CONTRIBUTING CHARACTERS OF OYSTER MUSHROOM (Pleurotus florida)(Sher-e-Bangla Agricultural University Research System (SAURES), Dhaka, Bangladesh, 2008-07) Bhuyan, M. H. M. B.; Nuruddin, M. M.; Ahmed, K. U.; Panna, R.The study was conducted to determine the effect of watering intervals on the yield and yield contributing characters of oyster mushroom (Pleura/lis florida) during March to June 2007 at Mushroom culture house, SAU. Water was sprayed on spawn packet at 24, 12,8 and 6 hours interval with a control (no watering). The lowest duration (8.020 days) from stimulation to harvest was recorded in watering at 6 hours interval. The highest number of fruiting body (57.54 per packet) was obtained from watering at (, hours interval. Fresh weight of fruiting body (4.53g) was also the highest under watering at (, hours interval. The lowest length (2.25 ern) and highest diameter (0.90 ern) of stalk; the highest diameter (589 ern) and thickness (0.79 ern) of pileus were obtained from watering at 8 hours interval. The highest biological yield (265.4g), economic yield (254.5g) and dry yield (25.51 g) were counted under watering at 6 hours interval. The highest biological efficiency of 91.52% was recorded in watering at 6 hours interval. A significant positive correlation among watering interval and dry yield, and watering interval and biological efficiency were observed. It was found that 62.21 % of dry yield and 63'% of biolouical efficiencv were attributed to the watering interval.,