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Bangladesh Journal of Agricultural Research
   [3 followers]  Follow    
  This is an Open Access Journal Open Access journal
     ISSN (Print) 0258-7122
     Published by Bangladesh Journals Online Homepage  [85 journals]
  • Effect of seed rate and sowing method on foliage production of different
           genotypes of coriander (Coriandrum sativum L.)

    • Authors: M Moniruzzaman, MM Rahman, MM Hossain, AJM Sirajul Karim, QA Khaliq
      Abstract: A field experiment on coriander (Coriandrum sativum L.) was conducted at Bangabandhu Sheikh Mujibur Rahman Agricultural University, Gazipur during February 2009 to April 2009 to find out the optimum seed rate in relation to sowing methods for maximizing foliage yield of coriander. Four genotypes (CS001, CS002, CS003 and CS008) and three sowing methods (continuous line sowing spaced at 10 cm, 20 cm and broadcast method) and three levels of seed rate (30, 40 and 50 kg/ha) were used as treatment variables.. The result showed that genotype CS003 singly gave the maximum plant height, number of leaves/plant, single plant weight and plant weight/m2 and thus gave the highest foliage yield/ha. Line sowing (10 cm), broadcast method with seed rate @ 50 kg/ha independently produced the maximum foliage weight/m2 and foliage yield/ha. Line sowing (10 cm) with 50 kg/ha seed rate produced the highest foliage yield in case of CS001, CS002 and CS003 genotypes, which was closely followed by broadcast method and the same seed rate. But line sowing (10 cm) as well as broadcast method coupled with 40 kg/ha seed rate gave better foliage yield in genotype CS008.
      DOI : http://dx.doi.org/10.3329/bjar.v38i3.16970 Bangladesh J. Agril. Res. 38(3): 435-445, September 2013
      PubDate: 2013-11-11
      Issue No: Vol. 38 (2013)
       
  • Fertilizer management in hybrid maize (Zea mays l.)-mukhikachu (Colocasia
           esculenta) relay cropping system

    • Authors: MN Islam, M Akhteruzzaman, MS Alom, MAI Sarker, MA Mannaf
      Abstract: The experiment was conducted at the research field of Agronomy Division, BARI, Joydebpur, Gazipur and ARS, Burirhat, Rangpur during consecutive two years of 2009-10 and 2010-11 to find out optimum fertilizer dose for hybrid maize-mukhikachu relay cropping system. Five fertilizer combinations viz, Recommended fertilizer of hybrid maize (RFM) + 112 kg N/ha, RFM + 25% recommended fertilizer of mukhikachu (RFK), RFM + 50% RFK, RFM + 75% RFK and RFM + 100% RFK were tested on hybrid maize-mukhikachu relay cropping system. Sole crops of hybrid maize (cv. BARI Hybrid Maize-5) and mukhikachu (cv. Bilashi) with their respective recommended fertilizer dose (maize: 255-55-140-40-6-2 kg/ha NPKSZnB and mukhikachu: 112-32-95-22 kg/ha NPKS) were included for comparison. Grain yield of sole maize with recommended fertilizer practice was identical with other fertilizer combinations at both the locations. Yield and yield components of mukhikachu under different fertilizer management practices increased with the increase of fertilizer levels up to RFM + 50% RFK and then decreased at both the locations. Edible yield of sole kachu with recommended fertilizer practice was the highest but it was identical to RFM + 50% RFK at both the locations. The highest maize equivalent yield (Joy: 24.26 t/ha, Buri: 31.56 t/ha) and gross return (Joy: Tk 291120/ha, Buri: Tk 378720/ha) was recorded in RFM + 50% RFK. But the highest gross margin (Joy: Tk 207035/ha, Buri: Tk 291570/ha) was obtained from RFM + 25% RFK at Joydebpur and from RFM + 50% RFK at Burirhat. The highest benefit cost ratio (Joy: 3.69, Buri: 4.64) was found from RFM + 112 kg N/ha at both the locations. The results revealed that recommended fertilizer dose (255-55-140-40-6-2kg/ha NPKSZnB) of hybrid maize plus 112 kg N/ha (extra) might be economically profitable for hybrid maize mukhikachu relay cropping system at both the locations.
      DOI : http://dx.doi.org/10.3329/bjar.v38i3.16975 Bangladesh J. Agril. Res. 38(3): 481-489, September 2013
      PubDate: 2013-11-11
      Issue No: Vol. 38 (2013)
       
  • Micropropagation of Strawberry (Fragaria ananassa) through runner culture

    • Authors: M Ashrafuzzaman, SM Faisal, D Yadav, D Khanam, F Raihan
      Abstract: In vitro propagation of strawberry was conducted at the Biotechnology Lab. of BARI, Joydebpur, Gazipur. For shoot induction, five BAP concentrations viz., 0.0 (Control), 0.5, 1.0, 1.5, and 2.0 mg/l and for root induction four IBA concentrations viz., 0.0 (Control), 0.5, 1.0, and 1.5 mg/l were used. The highest average number of shoots (7) and the highest average length (3.34 cm) of shoot was observed at the concentration of 0.5 mg/l BAP. The highest average number of leaves (5) was also observed at the same concentration. Among the five rooting concentrations, IBA @ 0.5 mg/l showed the best performance in all the parameters studied. The highest number (6) of roots/culture and the longest (3.05 cm) roots were also obtained from this concentration. Half strength MS media without IBA concentration did not show any response regarding root induction.
      DOI : http://dx.doi.org/10.3329/bjar.v38i3.16973 Bangladesh J. Agril. Res. 38(3): 467-472, September 2013
      PubDate: 2013-11-11
      Issue No: Vol. 38 (2013)
       
  • Effect of rate of arbuscular mycorrhiza inoculum on Tomato (Solanum
           lycopersicum) seedlings

    • Authors: MAH Bhuiyan
      Abstract: An experiment on the effect of rate of Arbuscular mycorrhiza (AM) inoculum on tomato seedlings was conducted at Bangladesh Agricultural Research Institute, Joydebpur, Gazipur, Bangladesh for two consecutive years. Seven rates of AM inoculum viz., 0, 0.5, 1.0, 1.5, 2.0, 2.5, and 3.0 kg/m2 were tested. Cowdung was used at a rate of 5 kg/m2. Seeds were sown in 10 cm apart lines on 13 November 2007 and 11 November 2008, and the seedlings were thinned out to about 3 cm from seedling to seedling within a week of germination. Roma VF was used as a variety of tomato. Biomass yield, root colonization, spore number, and nutrient uptake by tomato seedlings increased remarkably with the rates of AM inoculum. The biomass yield followed a quadratic trend with the increase of AM inoculum rate from 0 to 2.0 kg/m2 in 2007-08 and 0 to 1.5 kg/m2 in 2008-09.
      DOI : http://dx.doi.org/10.3329/bjar.v38i3.16974 Bangladesh J. Agril. Res. 38(3): 473-480, September 2013
      PubDate: 2013-11-11
      Issue No: Vol. 38 (2013)
       
  • Farm level potato (Solanum tuberosum l.) Cultivation in some selected
           sites of Bangladesh

    • Authors: SM Shahriar, M Kamrul Hasan, M Kamruzzaman
      Abstract: The study was carried out in two intensive potato growing areas (Rangpur and Munshigonj) to estimate the technical efficiency of potato producers and to describe the level of variation in potato productivity due to differences in input use. Data were collected from 60 farmers (30 farmers from each district) using simple random sampling technique. Average technical efficiency was 86% implying that on average 14% inefficiency remained at producers’ level. The application of human labour, MoP, and weedicides would increase potato yield significantly. On the other hand, the coefficient of urea and pesticide cost was found negative and significant which advarsely effect the yield of potato. Moreover, the coefficient of operated land and extension linkage were found negative and significant implying that with further increase in operated land and extension linkage, technical efficiency would increase. Munshigonj was found to be more suitable area for potato production. The performance of selfproduced and stored potato seeds are poor compared to the seeds from BADC. Supply of quality seeds to the farmers should be ensured by strengthening seed production and distribution system both in public and private sectors.
      DOI : http://dx.doi.org/10.3329/bjar.v38i3.16972 Bangladesh J. Agril. Res. 38(3): 455-466, September 2013
      PubDate: 2013-11-11
      Issue No: Vol. 38 (2013)
       
  • Split application of inorganic fertilizers in potato (Solanum tuberosum
           L.)-hybrid maize (Zea mays L.) Intercropping system

    • Authors: MN Islam, M Akhteruzzaman, MS Alom
      Abstract: The experiment was conducted at the research field of Agronomy Division, BARI, Joydebpur, Gazipur during the rabi season of 2009-10 and 2010-11 to find out economic fertilizer dose along with time of split application of fertilizers to potato-hybrid maize intercropping system for higher productivity. Six treatment combinations were derived through combining two fertilizer doses F1= 255-55-140-40-6-2 and F2=320-73-170-50-6-2 kg/ha NPKSZnB and three levels of split applications viz., S1= 1/3 N and full of PKSZnB (basal as broadcast) + 1/3 N top dressed at 30 DAP (days after planting) of potato + 1/3 N top dressed after potato harvest, S2= 1/3 N & ½ of PKSZnB (basal in potato rows) + ½ of PKSZnB (basal for maize) + 1/3 N top dressed at 30 DAP of potato + 1/3 N top dressed after potato harvest and S3= ¼ N & ½ of PKSZnB (basal in potato rows) + ½ of PKSZnB (basal for maize) + ¼ N top dressed at 30 DAP of potato + ¼ N top dressed at 60 DAP of potato to maize rows only + ¼ N top dressed after potato harvest. Sole crops of hybrid maize and potato with recommended fertilizer dose of 255-55-140-40-6-2 and 135-30-135-15-4-0.5 kg/ha NPKSZnB were included for comparison. The highest tuber yield of potato (24.24 t/ha) and grain yield of maize (9.48 t/ha) were obtained from respective sole crops with recommended fertilizer management. The highest potato equivalent yield (30.26 t/ha), gross return (Tk. 363120/ha), gross margin (Tk. 258620/ha), and benefit cost ratio (3.47) were obtained from F1S3. The results revealed that fertilizer dose of 255-55-140-40-6-2 kg/ha NPKSZnB along with its split application, ¼ N and ½ of PKSZnB (basal in potato rows) + ½ of PKSZnB (basal for maize) + ¼ N top dressed at 30 DAP of potato + ¼ N top dressed at 60 DAP of potato to maize rows only + ¼ N top dressed after potato harvest, might be economically profitable for potato hybrid maize intercropping system.
      DOI : http://dx.doi.org/10.3329/bjar.v38i3.16971 Bangladesh J. Agril. Res. 38(3): 447-453, September 2013
      PubDate: 2013-11-11
      Issue No: Vol. 38 (2013)
       
  • Effect of N, P, K, and Mg application on yield and fruit Quality of
           mandarin (Citrus reticulata)

    • Authors: Shamima Nasreen, R Ahmed, MA Ullah, MA Hoque
      Abstract: The study was carried out at the farmer's field of Juri Upazilla, Maulavibazar District during 2008-2009, 2009-2010, and 2011-2012 to find out the proper combination of fertilizer nutrients that promotes better fruit yield and quality of mandarin (cv. Khashi Kamla). The treatments were Native nutrient i.e., control (TI), N150P50K150Mg30 (T2), N200P75K175Mg40 (T3), N250P100 K200Mg50 (T4), N300P125K225Mg60 (T5), and N200P75K175Mg0 (T6) g/plant/year. In addition, 20 kg cowdung/plant was used as blanket dose. Yield components, yield, and TSS content (%) of mandarin varied significantly due to variation of nutrients in all the test years. Fruit yield/plant was improved significantly with increase in NPK and Mg dose irrespective of years. Application of Mg in combination with NPK increased 17-157% mean fruit yield over magnesium control. Significantly the highest yield and yield attributes were recorded under treatment N300 P125 K225 Mg60 g/plant (T5) along with 20 kg cowdung/plant in all the years. Total soluble sugar (%) content was also maximum in trees receiving N300P125K225Mg30 g/plant. The highest gross margin and marginal rate of return were achieved by the same treatment (T5). The lowest fruit yield/plant was obtained from untreated control plot (native nutrient). Three years’ study revealed that application of N300P125K225Mg60 along with 20 kg cowdung/plant would be economically optimum for achieving higher yield and better fruit quality in mandarin grown under piedmont plain soil.
      DOI : http://dx.doi.org/10.3329/bjar.v38i3.16969 Bangladesh J. Agril. Res. 38(3): 425-433, September 2013
      PubDate: 2013-11-11
      Issue No: Vol. 38 (2013)
       
  • Genetic divergence in rapeseed-mustard (Brassica rapa L.)

    • Authors: MH Khan, MM Ali, SR Vhuiyan, F Mahmud
      Abstract: An experiment was conducted at the experimental farm of Sher-e-Bangla Agricultural University, Dhaka, during November 2009 to February 2010 to study the genetic divergences of 32 genotypes of Brassica rapa L. through principal component analysis and Mohalanobis D2 analysis. Analysis of variance indicated that considerable genetic variability were existed among the 32 genotypes. On the basis of D2 analysis, the genotypes were grouped into 6 clusters. Cluster III had the maximum number of 11 genotypes, while the cluster IV and cluster V had only 2 genotypes each. The highest inter-cluster distance was observed between cluster I and V (21.871), while the lowest in the cluster II and III (4.237). The intra cluster distance was the maximum in cluster V (0.469) and minimum in cluster III (0.116). The characters yield per plant, number of siliquae per plant, and days to maturity were found prominent towards the genetic divergence. The genotypes G-15 and G-19 from cluster IV and G-1, G- 3, G-4, G-10, G-18, and G-24 from cluster I were suitable for creating more variability for higher yield per plant through hybridization
      DOI : http://dx.doi.org/10.3329/bjar.v38i3.16968 Bangladesh J. Agril. Res. 38(3): 417-423, September 2013
      PubDate: 2013-11-11
      Issue No: Vol. 38 (2013)
       
  • Screening of different plant extracts against leaf spot (Cercospora
           arachidicola and Cercosporidium personatum) of groundnut (Arachis hypogaea
           L.)

    • Authors: MH Hossain, I Hossain
      Abstract: A study was undertaken to evaluate effectiveness of foliar spray with 33 plant extracts against leaf spot (Tikka) of groundnut caused by Cercospora arachidicola and Cercosporidium personatum. Bavistin and BAU-Biofungicide were included in the experiment as checks and spray of plain water represented control. Almost all treatments gave considerable reduction in disease incidence and increase in growth parameters, pod and haulm yield compared to control. The most effective materials were Bavistin 50 WP, BAU-Biofungicide, leaf extract of neem, tomato, datura black, and datura white. The materials decreased spot number per leaf, defoliation per plant, incidence of leaf spot, and number of infected leaf per plant by 35.45 -60.07, 42.06-72.20, 51.97–63.58, and 38.33 to 46.89 % and increased pod yield and haulm yield by 64.37-111.41 and 32.35- 74.71 %, respectively. The materials may be recommended against the disease after economic analysis.
      DOI : http://dx.doi.org/10.3329/bjar.v38i3.16976 Bangladesh J. Agril. Res. 38(3): 491-503, September 2013
      PubDate: 2013-11-11
      Issue No: Vol. 38 (2013)
       
  • Panikachu (Calocasis esculenta L. Schott) cultivation in some selected
           areas of Bangladesh: an agro-economic profile

    • Authors: MA Haque, MA Monayem Miah, S Hossain, AN Luna
      Abstract: Panikachu is a nutritious vegetable contributing to the total supply of vegetables during the summer in Bangladesh. Many farmers cultivate this crop from their innovative ideas. Researchers are unable to formulate adequate research design for its varietal improvement and technology packages. Therefore, the study was conducted in two panikachu growing districts, namely Joypurhat and Jessore during February 2011 to know the profitability of panikachu cultivation. In total, 100 panikachu farmers were selected of which 50 farmers from each area were selected randomly to collect primary data. The results indicated that the costs of panikachu cultivation were Tk. 2,67,726 and Tk. 1,84,530 per hectare on total cost and variable cost basis, respectively. The major share of total cost was for human labour (45%), land use (17%), and fertilizer (15%). The yield for rhizome and stolon were 24.94 tons and 23.29 tons per hectare. The gross margin and net returns were Tk. 2,06,058 and Tk. 1,22,862 per hectare. The benefit cost ratios was 1.46. Human labour, manure, urea, TSP, MoP, insecticides, and irrigation had positive effect on the yield of panikachu. Lack of technical knowledge about improved cultivation practices, non-availability of HYV seedling, and low price of product were major constraints to panikachu cultivation.
      DOI : http://dx.doi.org/10.3329/bjar.v38i3.16977 Bangladesh J. Agril. Res. 38(3): 505-513, September 2013
      PubDate: 2013-11-11
      Issue No: Vol. 38 (2013)
       
  • Correlation and path analysis of durum wheat (Triticum turgidum L. Var.
           Durum)

    • Authors: AA Khan, MA Alam, MK Alam, MJ Alam, ZI Sarker
      Abstract: A study was conducted to examine relationship between important traits of durum wheat and their direct and indirect effects on grain yield. Research work was conducted during the winter season of 2009-10 under irrigated optimum seeding condition at Regional Agricultural Research Station, Bangladesh Agricultural Research Institute, Ishurdi, Pabna with 10 advanced genotypes. A wheat variety was used as check. Positive and significant correlation was found for plant height, spikes/m2, and 1000-grain weight with grain yield. Head days and maturity days showed considerable negative correlation with grain yield. Maturity days, spikes/m2, and 1000-grain weight had significant positive direct effects on grain yield. Grains/spike had direct positive effect but in low magnitude. The indirect effect of head days and plant height on grain yield was found mainly through maturity days and 1000-grain weight. It can be concluded that more emphasis should be given on head days and plant height along with 1000-grain weight, spikes/m2, and grains/spike during selection for dururn wheat improvement.
      DOI : http://dx.doi.org/10.3329/bjar.v38i3.16978 Bangladesh J. Agril. Res. 38(3): 515-521, September 2013
      PubDate: 2013-11-11
      Issue No: Vol. 38 (2013)
       
  • Performance of different crop species with pointed gourd (Trichosanthes
           dioica Roxb.)

    • Authors: MS Alom, BL Nag, MN Islam, F Ahmed, S Akther
      Abstract: The experiment was conducted at the Regional Agricultural Research Station, Jessore during the period from November 2008 to April 2010 to find out the suitable component crop and planting system under intercropping system with pointed gourd for higher yield and economic return. The treatment combinations were T1 = Pointed gourd (PG) sole, T2 = PG + radish + mungbean (1 row at the boarder of the bed) + amaranth (broadcast), T3 = PG + radish + mungbean (2 rows at the boarder of the bed) + shabuj shak (broadcast), T4 = PG + radish + Indian spinach (1 row at the boarder of the bed), T5 = PG + radish + Indian spinach (2 rows at the boarder of the bed) and T6 = PG + radish + mungbean: Indian spinach (1 : 1 row at the boarder of the bed). The fruit yield (26.27-30.50 t/ha) of pointed gourd did not affect by sole and different intercropping systems. The highest pointed gourd equivalent yield (68.02 t/ha), gross return (Tk.1020300/ha) and net return (Tk.631466/ha) and benefit cost ratio (2.62) was obtained from the intercropping combination of PG + radish + Indian spinach (2 rows at the boarder of the bed).
      DOI : http://dx.doi.org/10.3329/bjar.v38i3.16979 Bangladesh J. Agril. Res. 38(3): 523-529, September 2013
      PubDate: 2013-11-11
      Issue No: Vol. 38 (2013)
       
  • Study of heterosis in heat tolerant tomato (Solanum lycopersicum) during
           summer

    • Authors: MM Alam Patwary, M Mizanur Rahman, Shahabuddin Ahmad, MA Khaleque Miah, Haimonti Barua
      Abstract: An experiment was conducted at the Vegetable Research Field of Olericulture Division, Horticulture Research Cente, Bangladesh Agricultural Research Institute (BARI), Gazipur during May to October 2008 to study heterosis using eight parents viz., P1, P2, P3, P4, P5, P6, P7, and P8. Most of the combinations showed better parent heterosis for earliness. Eight crosses showed positive heterosis for flower production. The highest heterotic effect for fruit set (%) was found in the cross P6 × P7 (62.59%) followed by that in P7 × P8 (60.49%) and P1 × P7 (40.00%). For fruits per plant, 8 crosses provided more than 15 % heterosis over better parent. Considering fruit yield per plant, higher degree of heterosis was manifested by 24 hybrids over better parent ranging from 13.58 to 282.63 %. Cross combination P4 x P7 showed the maximum significant positive heterosis followed by P6 x P7 (187.84 %), P4 x P8 (166.97 %), P3 x P7 (146.08 %), P3 xP6 (103.92 %), and P1 X P7 (100.45 %) and the minimum in P4 x P6 (13.58 %). For viable pollens, P3 x P5 (20.56 %) exhibited the highest positive heterosis. In case of shelf life, the highest heterosis was observed by the cross P3 x P6 (22.78 %) followed by that in P4 x P6 (22.29 %) and P2 x P6 (14.40 %). For fruit flesh thickness, 12 hybrids exhibited more than 10 % heterosis. Pollen tubes as well as viable pollens showed positive correlation with fruit set.
      DOI : http://dx.doi.org/10.3329/bjar.v38i3.16980 Bangladesh J. Agril. Res. 38(3): 531-544, September 2013
      PubDate: 2013-11-11
      Issue No: Vol. 38 (2013)
       
  • Variation In Seed Quality Of Radish Preserved In Different Storage
           Containers

    • Authors: MK Quais, S Jahan, MM Haque, MR Khan
      Abstract: not available
      DOI : http://dx.doi.org/10.3329/bjar.v38i3.16981 Bangladesh J. Agril. Res. 38(3): 545-552, September 2013
      PubDate: 2013-11-11
      Issue No: Vol. 38 (2013)
       
  • Farmers’ perception about variety development and Abiotic stresses
           on potato cultivation in Bangladesh

    • Authors: MA Monayem Miah, TMB Hossain, S Hossain, MS Kadian, M Hossain
      Abstract: The socio-economic information on variety development and abiotic stresses of potato cultivation at farm level are scarce in Bangladesh. Therefore, an attempt was made to assess farmers’ perceptions about variety development and different abiotic stresses on potato cultivation. Primary data were collected from 240 potato farmers of Bogra and Chittagong district. The study revealed that Granula, Cardinal, and Lalpakri were the most preferred potato varieties in Bogra, while Diamant and Dohazari were the dominant varieties in Chittagong. Most farmers (70.87%) believe that the current potato yield (21.5-22.67 t/ha) can be further increased through introducing new HYVs. Drought and heat were two important limiting factors towards achieving the higher levels of potato yield. High yielding ability was considered as the most desirable varietal character and this was opined by almost 92.1% respondents, followed by drought resistant (61.13%), proper late blight control (58.75%), availability of adequate fund (57.77%), heat tolerant (53.60%), early maturity (61.5%), and good demand (44.5%) for HYV potatoes, whereas good test (81.7%), higher price (69.6%) and good storability (65.2%) were reported for local varieties. Low yield, susceptible to diseases, late maturity and low demand were the reasons for abandoning some potato varieties in the past. Dohazari variety for Chittagong and Lalpakri for Bogra have higher levels of tolerance against abiotic stresses. Finally, early maturity followed by drought tolerance, heat tolerance, and salinity tolerance were important attributes farmers wanted in new potato varieties.
      DOI : http://dx.doi.org/10.3329/bjar.v38i3.16926 Bangladesh J. Agril. Res. 38(3): 401-416, September 2013
      PubDate: 2013-11-09
      Issue No: Vol. 38 (2013)
       
  • Fish-Paddy Crop Rotation Practice In South- West Coastal Region Of
           Bangladesh: A Profitable Technology For The Poor Farmers

    • Authors: Anupam Kumar Roy, Alokesh Kumar Ghosh, Sheikh Tareq Arafat, Khandaker Anisul Huq
      Abstract: The study was conducted at the farmer’s pond at Sadar Upazilla of Bagerhat District, South-west coastal region of Bangladesh during the period from May 2006 to April 2007 to understand the present status of crop rotation practice and assess the production and cost benefit ratio of the existing culture practices. Two treatments viz., the crop rotation with paddy (T1) and the shrimp-prawn-fish culture (T2) were used in the studies. Shrimp (Penaeus monodon), prawn (Macrobrachium rosenbergii), and catla (Catla catla) were stocked at 20000, 10000, and 250 individuals/ha, respectively, in both treatments. In T1, aquaculture phase was from May to December 2006, and the episode of paddy (BRRI dhan 28) cultivation was initiated after full harvest of aqua products and continued till April. Similar farm inputs were given for the common components in both the treatments. Shrimps were harvested four months following stocking in both T1 and T2 treatments.. In T1, production of shrimp, prawn, and catla were 347.20, 355.35, and 140.4 kg/ha, respectively and in T2, productions were 354.38, 432.37, and 204.7 kg/ha, respectively. In T1, total paddy production was 6200 kg/ha. Net benefit in T1 and T2 was Tk. 300,477 and Tk. 262,561/ha, respectively.
      DOI : http://dx.doi.org/10.3329/bjar.v38i3.16924 Bangladesh J. Agril. Res. 38(3): 389-399, September 2013
      PubDate: 2013-11-09
      Issue No: Vol. 38 (2013)
       
  • Assessing Aphid Infestation in Indian Mustard (Brassica juncea L.) under
           Present and Future Climate Scenarios

    • Authors: B Bapuji Rao, VUM Rao, Linitha Nair, YG Prasad, AP Ramaraj, C Chattopadhyay
      Abstract: Mustard (Brassica juncea L.) production in India suffers from aphid, Lipaphis erysimi (Kaltenbach), infestation considerably. Role of weather on the incidence and development of mustard aphids was assessed from experimental data from six north Indian locations. Aphid appearance and population build up was found to be regulated by temperature and time to attain peak population was relatively short in warm humid climates than in cool climates. Aphids appeared generally when the accumulated thermal time ranged between 810-847 and diurnal temperature range had a key role on the pest build up. Functional relations developed from the present study between aphid incidence and peak population using previous weeks weather and pest data for majority of the locations could be used for taking of any prophylactic/control measures. Projections on aphid population in future climates using generated weather variables indicated that warming may not increase aphid population at all locations uniformly.
      DOI : http://dx.doi.org/10.3329/bjar.v38i3.16924 Bangladesh J. Agril. Res. 38(3): 373-387, September 2013
      PubDate: 2013-11-09
      Issue No: Vol. 38 (2013)
       
 
 
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