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Articles by M.S. Alam
Total Records ( 11 ) for M.S. Alam
  M.S. Alam , M.A.K. Chowdhury , Sushanta Kumar Saha , Md. Saifuzzaman and M. M. Rahman
  In this research work, a mathematical model for simulation of solar radiation system has been developed by using system dynamics methodology. Bangladesh is used here for model validation. The simulated results obtained from this model have compared with the experimental results and found reasonably a good agreement. Therefore the performance of the model is to be expected as satisfactory.
  M.S. Alam , M.R. Alam and K.K. Islam
  In this paper, a qualitative energy flow analysis in Bangladesh agriculture has been made for a period from 1980-81 to 2000-01 to evaluate the impact of energy input to produce output. Human & animal muscle power and machinery energy for tillage operation, electricity and diesel energy for irrigation, fertilizer and pesticides energy for growth and protection are taken into account. Energy values are calculated by multiplying respective quantity by their respective energy equivalents with the use of relevant conversion factors. Energy flow studied based on some energy dependent indicators: energy input per ha, energy output per ha, energy output to input ratio, mechanization index, energy input to generate per unit GDP output as well as per unit output in energy term and solar energy conversion efficiency. During the study period, energy input and output to Bangladesh agriculture were increased from 6.4 to 17.32 GJ ha¯1 and 72.22 to 130.05 GJ ha¯1, respectively. It is found that energetic efficiency (energy output to input ratio) was declined from 11.28% to 8.1%, which indicates that the energy input increased faster than energy output. It is expected that sustainable energy flow in Bangladesh agriculture can be ascertained by this study.
  M.A. Rahim , M.N.A. Chowdhury , H.R.M.M. Anwar and M.S. Alam
  An experiment was conducted to performance study of collected germplasm of garlic in different dates of planting at the Horticulture Farm of Bangladesh Agricultural University, Mymensingh during the period from October 1997 to April 1998. The objective of the work was to observe the performance of different local and exotic germplasm of garlic in different dates of planting and to get maximum yield of garlic. There were two planting time viz. October and November 30 and ten germplasm were Natore (G1), Dhaka, Keraniganj (G2), Syedpur (G3), Pabna (G4), Faridpur Tripple clove (G5), Jamalpur (G6), Faridpur Single clove (G7), Kishoreganj (G8), China (G9) and Australia (G10) were used as the experimental treatments. The experiment was laid out in Randomized Complete Block Design with three replications. With the delay in planting time from Oct 30 yield was reduced in later plantings. The highest bulb yield (8.56 t ha-1) was recorded when planting was done on October 30. The lowest yield was obtained from November 30 (3.96 t ha-1) planting. Germplasm G1 yielded (8.52 t ha-1) best followed by G2 (8.43), G7 (7.35) and G3 (7.29), respectively. The lowest yield (4.53) was obtained from Germplasm G8. Among 2 exotic germplasm (China and Australia) failed to form bulb. It may be concluded that early planting with local germplasm G1 and G2 is the best to get maximum yield of garlic.
  M.N. Islam , M.A. Rahim , M.S. Alam and N. Naher
  An experiment on the control of spiraling white fly (Aleurodicus dispersus Russel) by spraying detergent (wheel powder, Liver Brothers Ltd.) was conducted. Wheel powder, a cheap and readily available detergent in Bangladesh was sprayed to control the white fly. Wheel powder was sprayed in different concentration among which 10 g litre-1 of water and 15 g litre-1 of water were found more effective in controlling white fly. The concentration 20, 30 and 40 g litre-1 of water were found serious leaf burning, even total leaf dropping after 3rd spray.
  A.J. Kakon , M.A. Rahim and M.S. Alam
  An experiment was conducted to study the effect of variety and different nursery conditions on the survivability of air-layers of two varieties of guava at the Germplasm Centre (GPC) of Fruit Tree Improvement Project, Department of Horticulture, Bangladesh Agricultural University, Mymensingh during the period from August 2001 to July 2002. Planting air-layer after detached from the mother plant and planted under different nursery conditions showed significant variation in success of air-layers. Open condition (both layers in poly bag and layers in situ) increased the percentage of survivability then under shade condition. Layers in situ (both shade and open condition) increased the number of shoots and leaves of the detached air-layers than layers in polybag. The highest percentage of survivability (100%) was observed from layers in situ under open condition which was statistically similar to layers in polybag under open condition.
  M.A. Rahman , N.A. Siddquie , M.Robiul Alam , A.S.M.M.R. Khan and M.S. Alam
  Genetic analysis of yield and quality characters in spring wheat was studied in seven cultivars and their F1s obtained from a diallel cross without reciprocals at Bangladesh Agricultural University, Mymensingh. Graphical analysis revealed the presence of epistasis for the characters plant height, spikes per plant, spike length, grains per spike, 1000-grains weight, grain yield per plant and protein content. Partial dominance was showed by the characters days to maturity, plant height, grains per spike, 1000-grains weight and protein content. On the other hand the characters spikes per plant and spike length were controlled by over dominance. Among these gene actions partial dominance could easily be exploited through conventional breeding.
  M.B.R. Mollah , F.B. Islam , M.S. Islam , M.A. Ali and M.S. Alam
  Understanding the genetic diversity at molecular level is a prerequisite in developing strategies for effective conservation and utilization of chicken genetic resources. We studied the genetic variation within and between Bangladeshi native (Naked Neck, Frizzle and Non-descriptive indigenous) and exotic (White Leghorn, Rhode Island Red, Commercial layer and broiler) chicken populations by Random Amplified Polymorphic DNA (RAPD). Four out of the 20 random primers exhibited sufficient variability for studied populations. The four primers yielded a total of 39 distinct bands, 25 of which were polymorphic. Estimation of polymorphic loci, intra-population similarity indices and Nei’s gene diversity suggested that genetic diversities within a population were high in non-descriptive, Frizzle, Naked Neck, Rhode Island Red and White Leghorn chicken populations compared to the commercial layer and broiler populations. The coefficient of gene differentiation (GST = 0.34) and gene flow (Nm = 0.98) values reflected a high level of population differences. UPGMA dendrogram segregated the chicken populations in various degree based on their genetic distance. The overall genetic distance among native chicken was relatively low comparison to the exotic populations. The results of present study might have significant impact on the breeding and conservation of native chicken genetic resources in Bangladesh.
  M. Nazrul Islam , Kh. Asaduzzaman , Md. Shahzamal , Md. Nasrul Haque Mia , M.S. Alam , Mahmudul Hasan and Mahbubul Hoq
  A UWB bandpass filter has been presented in this study. The filter has been designed on a silicon substrate with Perfect Electric Conductor (PEC) microstrip parallel-coupled stub resonators. The filter comprises of Wave port, Infinite Ground Plane and 1 GHz bandwidth with centre frequency, f0 being 1.5 GHz ranges from 0.6-2.4 GHz. The filter has been designed and verified by HFSS simulation.
  M.Z. Alam , M. Ahmed , M.S. Alam , M.E. Haque and M.S. Hossin
  The experiment was carried out to investigate the effect of (a) three seedling ages viz. 21, 28 and 35 days and (b) four seedling raising techniques viz. normal wet, modified wet, floating and modified dapog on the yield and yield components of transplant aman rice cv. Binadhan 4. Except the number of non-effective tillers hill-1, weight of 1000-grains, harvest index and other characters were significantly influenced by both seedling ages and seedling raising techniques. Besides these, straw and biological yield showed non significant results in respect of seedling ages. The interaction between seedling ages and seedling raising techniques had significant effect on number of total tillers hill-1, number of effective tillers hill-1, grain, straw and biological yield.
  M. Hasanuzzaman , B.K. Biswas , M.S. Alam , H.F. El-Taj and M.R. Amin
  A total of 33 indigenous cultivars of sorghum [Sorghum bicolor (L.) Moench] were grown in replicated trial during rabi season of 1999 to assess genetic divergence based on ten developmental characters. The genotypes were grouped into five clusters. Amongst ten characters, grains/panicle paid maximum contribution towards genetic divergence. The inter-group distances were much longer than the intra-group distances. Cluster III was the largest with 11 genotypes and the cluster II was the smallest with 2 genotypes. Cluster III showed the maximum genetic distance (207.43) from cluster V. Simultaneous consideration of intercluster and intra cluster distances 7 genotypes of cluster I were genetically worthful to initiate the crossing programme for high heterotic effects in segregants. Cluster II exhibited the maximum intra cluster distance (3.15) and had considerable genetical divergence from rest of the clusters. Thus, 2 genotypes belonging to cluster II might be hybridized with the genotypes of other clusters for getting desirable improvement of specific traits in sorghum.
  L. Ghose , F.A. Neela , T.C. Chakravorty , M.R. Ali and M.S. Alam
  Healthy growth and development of silkworm is largely depending on the quality of mulberry leaves fed. Leaf blight is one of the common disease, which reduce the leaf yield and affects the rearing quality of the leaves. Leaf blight disease incidence of mulberry plant in different parts of Bangladesh was studied for three years. Disease incidence was studied by counting the healthy and infected leaves in three vigorous branches of each plant and disease severity was recorded according to grading method. The changes of amino acids and photosynthetic pigments in infected leaf were also performed by biochemical analysis. Results showed that the maximum leaf infection was found in Comilla and Rangamati which was 71.01 and 68.45%, respectively. The highest disease severity was recorded in Comilla (42.28%), Rangpur (38.87%) and Dinajpure (37.6%). Biochemical studies showed eight and five amino acids present in healthy and diseased leaves, respectively. Amino acid contents were always found to be higher in healthy mulberry leaves than infected ones with total absence of iso-leucine, glutamic acid and cystine. Serine, lysine, aspartic acid, leucine, glutamic acid, alanine and cystin were found in excess in healthy mulberry leaves. The drastic reduction of total chlorophyll, chlorophyll a, chlorophyll b and β-carotene in blight infected leaves and decreased by 53.24, 51.65, 56.53 and 58.04% were recorded. This study indicates that due to leaf blight infection and change in amino acids and chlorophyll a and b might be the cause of yield and quality reduction of mulberry leaves for silkworm production in Bangladesh.
 
 
 
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