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Journal Cover   Bangladesh Journal of Agricultural Research
  [4 followers]  Follow
    
  This is an Open Access Journal Open Access journal
   ISSN (Print) 0258-7122
   Published by Bangladesh Journals Online Homepage  [101 journals]
  • Effect of osmopriming on the emergence of Maize (Zea mays L.) seedling

    • Authors: KU Ahammad, MM Rahman, M Ahmed
      Abstract: The research work was carried out at the Seed Laboratory of Agronomy Department of Bangladesh Agricultural University, Mymensingh, Bangladesh during the period from March to November in 2008 to find out the effect of different osmopriming techniques on seedling emergence of maize. Seventeen osmopriming techniques viz., T1 = 1% Na2SO4, T2 = 3% Na2SO4, T3 = 5% Na2SO4, T4 = 1% K2HPO4, T5 = 3% K2HPO4, T6 = 5% K2HPO4, T7 = 1% ZnSO4, T8 = 3% ZnSO4, T9 = 5% ZnSO4, T10 = 1% Ca(H2PO4)2, T11 = 3% Ca(H2PO4)2, T12 = 5% Ca(H2PO4)2, T13 = 1% H2O2, T14 = 3% H2O2, T15 = 5% H2O2, T16 = Hydropriming, T17 = Non-priming (control) were used as experimental variables. Different osmopriming methods on seedling emergence performance of maize was evaluated at two moisture levels viz., 30 and 60% moisture of saturated sand in the experiment. Germination percentage, germination index and mean germination time were influenced significantly by osmopriming methods. Seed priming with 3% ZnSO4 showed the highest seedling emergence which was followed by 1% H2O2 and 3% Ca (H2PO4)2.
      DOI : http://dx.doi.org/10.3329/bjar.v39i3.21986 Bangladesh J. Agril. Res. 39(3): 427-435, September 2014
      PubDate: 2015-02-09
      Issue No: Vol. 39 (2015)
       
  • Leaching losses of Nitrogen, Phosphorus and Potassium from the sandy loam
           soil of old Brahmaputra floodplain (AEZ-9) under continuous standing water
           condition

    • Authors: MN Islam, MM Rahman, MJA Mian, MH Khan, R Barua
      Abstract: An experiment was conducted at the net house of the Department of Soil Science, Bangladesh Agricultural University (BAU), Mymensingh, Bangladesh during February to June (boro season) of 2009. The objective was to find out the leaching loss of N, P, and K in the Old Brahmaputra Floodplain Soil under continuous standing water (CSW) condition. The soil was sandy loam in texture having pH 6.6, total N 0.08%, available P 7.00 mg/kg, exchangeable K 0.07 me/100g soil, and available S 7.5 mg/kg. The experiment was laid out in completely randomized design with three replications. There were six treatments, such as T0 (control), T1 (N120 P25 K60 S20 recommended dose), T2 (N180 P37 K90 S30 kg/ha i.e., 150% of the recommended dose), T3 (75% N of T1 from chemical fertilizer and 25% N from cowdung 2.5 t/ha and PKS of recommended dose from chemical fertilizer on the basis of PKS content in cowdung), T4 (as T1 but N109 kg/ha from USG) and T5 (as T1 but N applied as foliar spray). The nutrients P, K, and S were applied as basal dose in the pots while urea was applied in three equal splits except T4 and T5. One USG per pot was placed after 7 days of transplanting in T4. In T5, urea was applied as foliar spray at 10 days interval. Leachates from individual pots were collected at 15 days intervals to determine the amount of loss of NPK. Results showed that leaching loss of NPK in the sandy loam soil under CSW condition varied widely due to different treatments over time. The total leaching loss of N, P, and K during the growing season varied from 22.23 to 91.21, 0.063 to 1.95, and 35.22 to 42.01 kg/ha, respectively. Application of chemical fertilizer at higher rates resulted in greater loss of nutrients. Integrated approach of fertilizer management could minimize such losses to a great extent. Application of N in the form of USG reduced the N loss significantly.
      DOI : http://dx.doi.org/10.3329/bjar.v39i3.21987 Bangladesh J. Agril. Res. 39(3): 437-446, September 2014
      PubDate: 2015-02-09
      Issue No: Vol. 39 (2015)
       
  • Boll rot of cotton (Gossypium hirsutum L.) caused by Rhizopus 0ryzae went
           & prins. Geerl.- A new record in Bangladesh

    • Authors: Shamim Shamsi, Najmun Naher
      Abstract: not available
      DOI : http://dx.doi.org/10.3329/bjar.v39i3.21996 Bangladesh J. Agril. Res. 39(3): 547-551, September 2014
      PubDate: 2015-02-09
      Issue No: Vol. 39 (2015)
       
  • Influence of integrated organic-inorganic Nitrogen on growth and nutrient
           concentration of summer Onion (Allium cepa

    • Authors: Saima Sultana, Alok Kumar Paul, Deeder Sultana, Jharna Rani Sarker
      Abstract: An experiment was carried out to assess the effect of integrated organic and inorganic nitrogen on growth and nutrient concentration in summer onion (Allium cepa var. BARI Piaz-2). The study was done on a silty clay loam soil of Sher-e-Bangla Agricultural University Farm, Dhaka during kharif (March to October) season. The soil of the experimental site belongs to the Tejgaon series of AEZ No. 28, Madhupur Tract, classified as Shallow Red Brown Terrace Soils in Bangladesh soil classification system. Twelve treatments were used in the experiment and in each treatment, different combinations of urea, cowdung, and vermicompost were used to supply nitrogen (N) at the rate of 120 kg/ha. The treatments were arranged in a RCBD with three replications included- control or no fertilizer supplied (T1), 120 kg N/ha supplied from urea (T2), 100 kg N/ha supplied from urea with 20 kg from cowdung (T3), 100 kg N/ha supplied from urea with 20 kg from vermicompost (T4), 80 kg N/ha supplied from urea with 40 kg from cowdung (T5), 80 kg N/ha supplied from urea with 40 kg from vermicompost (T6), 60 kg N/ha supplied from urea with 60 kg from cowdung (T7), 60 kg N/ha supplied from urea with 60 kg from vermicompost (T8), 40 kg N/ha supplied from urea with 80 kg from cowdung (T9), 40 kg N/ha supplied from urea with 80 kg from vermicompost (T10), 120 kg N/ha supplied from cowdung (T11), 120 kg N/ha supplied from vermicompost (T12). Data on plant height, number of leaves, leaf length, bulb length, and bulb weight of onion were recorded. Samples of bulb and leaf were analyzed for determining the total nitrogen, phosphorous, potassium, and sulphur content. Height of plant ranged from 24.25 to 39.25 cm with lowest and highest value from T1 and T5, respectively. Like plant height, the longest leaf length (34.35 cm) and bulb length (2.79 cm) was observed in T5, whereas the shortest leaf length (21.20 cm) and bulb length (2.40 cm) was recorded in T1 treatment. Similarly treatment T5 showed the highest value for both bulb weight (30.40 g) and bulb yield (12.16 t/ha), whereas the lowest bulb weight (14.90 g) and bulb yield (5.96 t/ha) was obtained from T1 treatment. Statistically insignificant variations were recorded on number of leaves/plant. The highest nitrogen, phosphorous, potassium and sulphur content in bulb (2.30, 0.185, 1.71 and 0.96%, respectively) and in leaf (2.91, 0.183, 2.45, and 0.98%, respectively) were recorded in treatment T5. Whereas, the lowest nitrogen, phosphorous, potassium, and sulphur content in bulb (1.41, 0.055, 0.89, and 0.66%, respectively) and in leaf (2.15, 0.053, 1.71 and 0.63%, respectively) was found in T1. Therefore, the overall results suggest that treatment T5 which supplied 40 kg N/ha from cowdung and rest 80 kg from inorganic urea resulted in maximum plant growth and nutrient concentration and can be recommended for optimum production of summer onion
      DOI : http://dx.doi.org/10.3329/bjar.v39i3.21995 Bangladesh J. Agril. Res. 39(3): 529-545, September 2014
      PubDate: 2015-02-09
      Issue No: Vol. 39 (2015)
       
  • Effect of Hydropriming and soil moisture regimes on yield and yield
           components of maize (Zea mays L.)

    • Authors: KU Ahammad, MM Rahman, MAM Molla, MG Azam
      Abstract: The experiment was conducted at the research field of Regional Agricultural Research Station, Jessore during two consecutive rabi seasons of 2008-2009 and 2009-2010 to find out the effect of hydropriming on the performance of maize seeds under variable soil moisture regimes. The treatments of the experiment were two priming methods viz., i) Hydropriming, ii) Non-priming and four moisture regimes viz., i) Wet condition, ii) Field capacity, iii) 75% of field capacity, and iv) 50% of field capacity. Results showed that yield and yield contributing characters (plant population/m2, number of cobs/m2, length of cob, diameter of cob, 100-grain weight) were influenced significantly by hydropriming. Yield and yield contributing characters were highest when hydroprimed seeds were sown at field capacity whereas it was the lowest at 75% of field capacity from non- primed seeds. Days to tasseling, days to silking, and days to maturity were reduced when hydroprimed seeds were sown at field capacity. At 50% of field capacity, no germination was occurred.
      DOI : http://dx.doi.org/10.3329/bjar.v39i3.21993 Bangladesh J. Agril. Res. 39(3): 505-513, September 2014
      PubDate: 2015-02-09
      Issue No: Vol. 39 (2015)
       
  • Nutrient management on leaf area index of potato-mungbean- T. aman rice
           cropping pattern

    • Authors: MAH S Jahan, MAR Sarkar, M Salim
      Abstract: A field experiment was conducted at Regional Wheat Research Centre of the Bangladesh Agricultural Research Institute, Joydebpur, Gazipur, Bangladesh for 2 consecutive years during 2006-07 and 2007-08. The objective was to find out the optimum nutrient management practice on leaf area index of each component crop of potato-mungbean-T. Aman rice cropping pattern. Twelve nutrient management treatments were tested in RCBD with 3 replications. Treatments combination based on cropping pattern were T1=HYG (0-198-44- 194-24-6-1.2 for potato; 0-24-40-48-24-3-1.2 for mungbean ; 0-80-16-44-12-2-0 for T.Aman rice ), T2=MYG (0-140-34-138-18-4.5-0.9 for potato; 0-20-36-40- 20-2-1 for mungbean ; 0-56-12-32-8-1.5-0 for T.Aman rice), T3=IPNS (10000- 168-38-170-18-6-1.2 for potato ; 5000-9-37-36-21-3-1.2 for mungbean ; 5000- 65-13-32-9-2-0 for T.Aman rice), T4=STB (0-171-40-164-22-5-1 for potato; 0- 20-36-40-22-2-1 for mungbean ; 0-68-15-37-11-2-0 for T.Aman rice), T5=FP (0- 97-16-91-0-0-0 for potato ; 0-6-5-4-0-0-0 for mungbean ; 0-39-37-12-0-0-0 for T.Aman rice), T6=CON (0-0-0-0-0-0-0 for potato, mungbean and T.Aman rice) kg/ha CDNPKSZnB, T7=HYG+CRI, T8=MYG+CRI, T9=IPNS+CRI, T10=STB+CRI, T11=FP+CRI, T12=CON+CRI for potato-mungbean T.Aman rice cropping pattern, respectively. Average of two years data showed that HYG+CRI treatment gave maximum LAI followed by HYG, IPNS+CRI, IPNS, STB+CRI, and STB treatments at 60 days after planting (DAP) for potato, at 50 days after sowing (DAS) for mungbean, at 60 days after transplanting (DAT) for T.Aman rice, respectively. For potato, there was a significant (p≤0.01) and positive linear relation between the LAI at 60 DAP and the tuber yield. While there was a significant (p≤0.01) and positive linear relationship between the LAI at 50 DAS and seed yield of mungbean. In case of T.Aman rice, there was a significant (p≤0.05) as well as positive linear relationship between the LAI at 60 DAT and the grain yield of rice.
      DOI : http://dx.doi.org/10.3329/bjar.v39i3.21994 Bangladesh J. Agril. Res. 39(3): 515-527, September 2014
      PubDate: 2015-02-09
      Issue No: Vol. 39 (2015)
       
  • Effect of plant spacing and nitrogen levels on nutritional quality of
           Broccoli (Brassica oleracea L.)

    • Authors: MS Roni, M Zakaria, MM Hossain, MN Siddiqui
      Abstract: The study was carried out in the research field and laboratory of the Department of Horticulture, Bangabandhu Sheikh Mujibur Rahman Agricultural University (BSMRAU), Gazipur-1706 during October 2011 to April 2012 to determine optimum level of nitrogen and spacing for improving the nutritional quality of broccoli. There were 15 treatments in the experiment comprising five levels of N viz., 0, 80, 120,160, and 200 kg/ha and three plant spacings viz., 60cm x 60cm, 60cm × 45cm, and 60cm × 30cm. The results revealed that the highest ascorbic acid content (50.38 mg/100g) was obtained from S60X30N0 and the highest b-carotene content (50.67 IU/100g) was found in S60X60N0. Maximum Ca (0.556%) was found in S60X60N0 whereas maximum Fe (159.002 ppm) was in S60X60N200. The maximum P content (0.081%) was observed in S60X60N160 and maximum K content (0.854%) was found in S60X45N160.
      DOI : http://dx.doi.org/10.3329/bjar.v39i3.21992 Bangladesh J. Agril. Res. 39(3): 491-504, September 2014
      PubDate: 2015-02-09
      Issue No: Vol. 39 (2015)
       
  • Production potentials and economics of chickpea-rice based cropping system
           in Sylhet area (AEZ 20)

    • Authors: Md Rayhan Shaheb, Mahmudul Islam Nazrul, MJU Sarker
      Abstract: Global food and feed demands have been projected to double in the 21st century, which will further increase the pressure on the use of land, water and nutrients. To increase food productivity, production potential and economic returns, improvement of cropping system may play a vital role in this regards. A study was conducted to determine the economic consequences of two cropping patterns viz., ICP: Improved Cropping Pattern (Chickpea-T.Aus-T.Aman) and FECP: Farmer’s Existing Cropping Pattern (Fallow-T. Aus-T. Aman) through incorporation of modern high yielding varieties and improved management practices for crop production at farmers' fields of Sylhet during three consecutive years 2009-10, 2010-11, and 2011-12, respectively. The experiment was laid out in randomized complete block design with six dispersed replications. The pooled data showed that the improved management practices for the pattern provided higher yield in T.Aus and T.Aman rice, respectively. The gross return and gross margin of ICP were higher compared to that of FECP with only 21% extra cost. The higher benefit cost ratio (2.20), rice equivalent yield (10.29 t/ha), production efficiency (27.36 kg/ha/day), land-use efficiency (91.32%) and sustainable yield index (0.41) indicated the superiority of the ICP over the FECP. Higher rice equivalent yield indicate that ICP is suitable in Sylhet region for increasing crop productivity and cropping intensity.
      DOI : http://dx.doi.org/10.3329/bjar.v39i3.21991 Bangladesh J. Agril. Res. 39(3): 479-490, September 2014
      PubDate: 2015-02-09
      Issue No: Vol. 39 (2015)
       
  • Determination of fertilizer dose for maize in Potatomaize- T. Aman rice
           cropping pattern

    • Authors: MJU Sarker, M Ali, AK Choudhury, MZH Prodhan, Mst A Akhter
      Abstract: A field experiment was conducted at the Multilocation Testing Site (MLT) Sherpur, Bogra (AEZ 4) during November 2007-08 to October 2008-09 to find out a suitable fertilizer dose for maize as a succeeding crop following potato under Potato-Maize- T.Aman rice cropping pattern. The treatments were, T1: Soil test based (STB) fertilizer dose of NPKS following FRG, 2005, T2: STB of 75% recommended dose of PKS + full N, T3: STB of 50% recommended dose of PKS + full N and T4: Farmers practice. From the two years' results, it was found that the most profitable grain yield of maize (7.54 t/ha) was obtained from the treatment T2 and the lowest (6.16 t/ha) was in T4 (Farmer’s practice). Economic analysis showed that the treatment T2 gave the highest net return, benefit cost ratio was also higher in maize. Fertilizer dose could be reduced by 25% for N. Considering all the issues, maize was best fitted crop under Potato- Maize-T. Aman cropping sequence in AEZ 4 at MLT site Sherpur, Bogra.
      DOI : http://dx.doi.org/10.3329/bjar.v39i3.21990 Bangladesh J. Agril. Res. 39(3): 471-477, September 2014
      PubDate: 2015-02-09
      Issue No: Vol. 39 (2015)
       
  • Effect of relative humidity, initial seed moisture content and storage
           container on soybean (Glycine max L. Meril.) seed quality

    • Authors: MR Ali, MM Rahman, KU Ahammad
      Abstract: To find out the effect of storage relative humidity, seed moisture content and type of storage container on soybean seed quality, an experiment was conducted at the Seed Laboratory, Department of Agronomy, Bangladesh Agricultural University Mymensingh in 2008 and 2009. In 2008, soybean seed has 96% initial germination and in 2009 seed having 98% initial germination was stored at 8% and 12% initial moisture levels in two types of storage containers viz., cloth bag and polythene bag (0.06mm thickness). The final seed moisture content, germination percentage, germination index, and seedling dry matter of the seed under different treatments were measured at 60,120, and 180 days after storage (DAS). The experiment was arranged in a completely randomized design with three replications. In 2008, highest germination percentage (89.33%) of soybean seed was retained at 180 days after storage (DAS) for those stored at 8% initial seed moisture content (SMC) in polythene bag at 50% relative humidity. Germination index and seedling dry matter decreased with increased initial seed moisture content irrespective of storage containers used. In 2009, highest germination percentage (92.67%) of soybean seed was retained at 180 DAS for those stored in polythene bag at 8% initial SMC at 50% of the relative humidity. Those stored in cloth bag at 12% SMC showed rapid germination loss and the value went down to 0.00 in both the years. Vigour index and seedling dry matter decreased with increased initial seed moisture content irrespective of storage containers used.
      DOI : http://dx.doi.org/10.3329/bjar.v39i3.21989 Bangladesh J. Agril. Res. 39(3): 461-469, September 2014
      PubDate: 2015-02-09
      Issue No: Vol. 39 (2015)
       
  • Profitability of crop cultivation under different land tenurial
           arrangements in some selected sites of Bangladesh

    • Authors: MA Islam, KL Maharjan
      Abstract: Proper land tenurial arrangements perceived as an important strategy for input use and agricultural production in utilization of land resource. Government of Bangladesh initiated due measures in this respect by formulating and declaring the land reform ordinance 1984.The main quest of this study is to identify the profitability of crop cultivation and factors influencing gross revenues in the variousl and tenurial arrangements under this land reform ordinance 1984. In search of this research question, a case study was conducted in two Upazilas (sub districts) of Bangladesh based on cross section data. This data were collected by purposive stratified sampling technique in the year 2013. Benefit cost ratio (BCR) was used to identify the profitability of crop cultivation under different land tenurial arrangements. Ordinary least square (OLS) regression method was used to identify the factors influencing gross revenues of the share cropped land of owner cum tenant farmers. This study reveals that the aspects of land reform ordinance have been implemented in output sharing aspect but not in input cost sharing aspect. Again BCR in leased land was higher than share cropped land. Moreover, regression analysis indicates that farm size had significant positive impact on gross revenues. The study holistically reveals that lease arrangements could be judged as a vital player to increase gross revenue as well as profit inshare cropped lands.
      DOI : http://dx.doi.org/10.3329/bjar.v39i3.21988 Bangladesh J. Agril. Res. 39(3): 447-460, September 2014
      PubDate: 2015-02-09
      Issue No: Vol. 39 (2015)
       
  • Genetic variability of yield and its contributing characters on CIMMYT
           maize inbreds under drought stress

    • Authors: Md Golam Azam, Umakanta Sarker, - Maniruzzam, Bhagya Rani Banik
      Abstract: This experiment was conducted in a randomized block design with three replications at Bangladesh Agricultural Research Institute, Gazipur-1701 during the rabi season of 2010 with 25 maize inbred lines. Correlation and path coefficient analysis were done for yield and some other traits. Genotypic variations were observed for ear height and grains/row. The highest broad sense heritability (h2b) was observed for yield/plant followed by ear height and 1000- grain weight. Maximum genetic advance in percentage of mean (GA) was recorded for yield/plant (92.652) and ear height (75.87). The yield/plant showed significant positive genotypic correlation (rg) with cob diameter (0.440) and grains/row (0.265). Significant negative correlation was observed between ear height and yield and also for days to 50% tasseling. The highest direct positive effect was obtained for rows/cob. These studies suggest that cob diameter, row per cob, grains/row and ear height were the most important yield contributing factors and an attempt should, therefore, be made for an effective selection of these traits.
      DOI : http://dx.doi.org/10.3329/bjar.v39i3.21985 Bangladesh J. Agril. Res. 39(3): 419-426, September 2014
      PubDate: 2015-02-08
      Issue No: Vol. 39 (2015)
       
  • Agricultural adaptation strategies to climate change impacts in Africa: a
           review

    • Authors: OM Akinnagbe, IJ Irohibe
      Abstract: Climate change is expected to intensify existing problems and create new combinations of risks, particularly in Africa. The situation is made worst due to factor such as widespread poverty, over dependence on rain fed agriculture, inequitable land distribution, limited access to capital and technology, inadequate public infrastructure, such as roads, long term weather forecasts and inadequate research and extension. By lessening the severity of key damages to the agricultural sector, adaptation is the key defensive measure. Adaptation to climate change involves changes in agricultural management practices in response to changes in climate conditions. This paper reviews agricultural adaptation strategies employed by farmers in various countries in Africa in cushioning the effects of climate change. The common agricultural adaptation strategies used by farmers were the use of drought resistant varieties of crops, crop diversification, changes in cropping pattern and calendar of planting, conserving soil moisture through appropriate tillage methods, improving irrigation efficiency, and afforestation and agro-forestry. The paper concluded that improving and strengthening human capital through education, outreach programmes, extension services at all levels will improve capacity to adapt to climate change impact.
      DOI : http://dx.doi.org/10.3329/bjar.v39i3.21984 Bangladesh J. Agril. Res. 39(3): 407-418, September 2014
      PubDate: 2015-02-08
      Issue No: Vol. 39 (2015)
       
  • Effect of ga and naa on physio-morphological characters, yield and yield
           components of Brinjal (Solanum melongena L.)

    • Authors: M Moniruzzaman, R Khatoon, MFB Hossain, MK Jamil, MN Islam
      Abstract: The experiment on brinjal (Solanum melongena L.) having seven growth regulators viz., control, 30 ppm GA3 , 40 ppm GA3, 50 ppm GA , 20 ppm NAA, 40 ppm NAA, and 60 ppm NAA and two varieties viz., BARI Begun-5 and BARI Begun -10 was conducted at the field of Plant Physiology Section of HRC during the rabi season (November 2011 to May 2013) to find out the suitable variety responsive to growth regulators and to determine the suitable dose of growth regulator for brinjal production. The GA3 (Gibberellic acid) and NAA (Naphthalene acetic acid) had no significant effect on plant height and stem diameter at the end of the crop period and days to 100% flowering. NAA 40 ppm produced highest percentage of long and medium styled-flower, leaf photosynthesis and Fv/Fm (efficiency of photosystem II), number of fruits /plant and fruit yield (45.50 t/ha). The variety BARI Begun-5 was earlier to 100% flowering which took 44 days after transplanting which outyielded BARI Begun-10. NAA 40 ppm coupled with BARI Begun-5 gave the maximum Fv/Fm, long-styled flower percent, number of fruits/plant, and the highest fruit yield (49.73 t/ha).
      DOI : http://dx.doi.org/10.3329/bjar.v39i3.21983 Bangladesh J. Agril. Res. 39(3): 397-405, September 2014
      PubDate: 2015-02-08
      Issue No: Vol. 39 (2015)
       
  • Divergence analysis of drought tolerant Genotypes of Wheat (Triticum
           astivum L.)

    • Authors: MA Zaman, MNA Siddquie, M Mahbubur Rahman, MY Abida, MJ Islam
      Abstract: Thirty genotypes of wheat were grown in an Alpha Lattice Design with three replications for evaluation and divergence analysis. Seeds were sown on 24 November 2011 at Regional Wheat Research Centre, Bangladesh Agricultural Research Institute, Shyampur, Rajshahi. Significant variation was observed among the genotypes and these are grouped into six clusters. Clusters III and VI were comprised of maximum number of genotypes (6) followed by clusters I, IV, and V with 5 genotypes and the minimum genotypes (3) were in cluster II. The maximum inter-cluster distance was recorded between the Cluster VI and Cluster II followed by cluster III and Cluster II, which indicates that genotypes belonging to these distant clusters could be used in hybridization programme for getting a wide spectrum of variation among the segregates. The minimum intercluster distance was found between the Cluster IV and Cluster I followed by that of Cluster V and Cluster IV. The maximum intra-cluster distance was recorded in Cluster II, consisted of three genotypes of diverse origin followed by Cluster V consisting of five genotypes which indicated that the genotypes of these clusters might have considerable diversity among themselves. While the minimum distance was computed in Cluster I composed of five genotypes which indicated that these genotypes were genetically very close to each other. Considering the eigenvalues of all principal component analysis the PC1, PC2, PC3, PC4, and PC5 with values contributed 30.78%, 20.11%, 17.75%, 10.93%, and 7.63%, respectively, of the total variation. The results revealed from the present study that the first principal component had high positive component loading from grains/spike and high negative loading from grain yield. Considering the clusters mean value, the genotype of Cluster II and VI are most divergent and maximum heterosis and wide variability in genetic architecture may be expected from the crosses between the genotypes belonged to these clusters. More specifically the cluster II could be selected for dwarf in nature, early heading and maturity and bold grain size. The genotypes from the cluster IV could be selected for maximum spikes/m2 and maximum grain yield. The positive value of both vectors for days to heading and spikes/m2 indicated that these traits had the highest contribution towards divergence among the 30 drought tolerant wheat genotypes.
      DOI : http://dx.doi.org/10.3329/bjar.v39i3.21982 Bangladesh J. Agril. Res. 39(3): 385-396, September 2014
      PubDate: 2015-02-08
      Issue No: Vol. 39 (2015)
       
 
 
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