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Articles by M.A. Rahman
Total Records ( 27 ) for M.A. Rahman
  S.R. Saha , M. Nazim Uddin , M.A. Rahman , S.M. Sharifuzzaman and A.K.M. Anwar Habib
  A study was conducted to optimize the time of sowing and stage of harvest of red amaranth during winter season to obtain higher yield without loss of palatability. It was observed that in November sowing, highest palatability (1.59) was achieved when harvested at 15 DAS. Harvesting at 20 days after sowing (DAS) was found to be suitable for November sowing considering economic yield as well as palatability. In December sowing had moderate palatability with leaf-stem ration 1.38. On the other hand, in January sowing when harvested at 30 DAS expressed acceptable leaf-stem ration (1.71). Therefore, considering yield and optimum palatability, harvesting of the crop should be done at 25 DAS in December sowing and 30 DAS in January sowing.
  M.H. Rahman , M.A.Salam , A.S.M.H. Masum , M.A. Rahman and M.M.A. Patwary
  A Study on quantitative characteristics of fruits of guava germplasm in both on and off seasons was carried out at the germplasm center, Fruit-Tree Improvement Project (FTIP) of the Department of Horticulture, Bangladesh Agricultural University, Mymensingh, during June, 2000 to April, 2001. Different quantitative characters were found statistically significant. In respect of different characters such as fruit size, fruit weight, thickness, weight of mesocarp and endocarp, number of seeds per fruit, percent edible portion. The guava showed better performance in both on and off seasons but fruits of off- seasons were better than that of on seasons. In respect of fruit weight, size, flesh weight, seed per fruit and percent edible portion, the germplasm PG-028, PG-027 and PG-005 were superior among all the germplasm in both the seasons.
  M.E. Haque , M.M. Pervin , M.Z. Rahman , K.M.K.B. Ferdaus , M.H. Kabir , M.A. Rahman , M.A. Bari Miah , M.R. Islam and M.T. Hoque
  The aim of present study was to investigate the bioactivity (antibacterial, antifungal and cytotoxicity etc.) of the ethylacetate extract isolated from Streptomyces sp. Aspergillus sp. and Bacillus sp. from sewage of different regions of Bangladesh. The ethylacetate extract of Streptomyces sp., Aspergillus sp. and Bacillus sp. shown modest antibacterial and antifungal activities at the concentration of 200 μg disc-1. The maximum antibacterial and antifungal activities were shown by the Streptomyces sp. The minimum inhibitory concentration of the microbial extracts was between 64 to 128 μg mL-1 against test organisms. Brine srimp lethality bioassay was carried out for cytotoxicity measurement of the extracts and the LC50 values were calculated after probit transformation of the resulting mortality data. All the ethyl acetate extract showed lower cytotoxicity properties (Streptomyces sp. 42.37 μg mL-1, Aspergillus sp. 52.25 μg mL-1 and Bacillus sp. 47.51 μg mL-1) compared with the reference standard Bleomycin (0.41 μg mL-1) and Galic acid (4.53 μg mL-1).
  M.S. Islam , M.O. Islam , M.N. Alam , M.K. Ali and M.A. Rahman
  A field experiment was conducted in the research field of Bangladesh Institute of Nuclear Agriculture (BINA), Mymensingh, during the period from December 2003 to March 2004 to study the effect of GABA on growth and yield attributes of onion (cv. BARI peaj-1). The experimental field was medium fertile and silt loam in texture. Effect of GABA (a mixture of GA3 and STC4771) sprayed at 30 DAT with 0.0, 0.5, 1.0 and 2.0 mg L-1 was investigated. The treatments were laid out in one factorial RCBD design where each treatment was replicated five times. All morphological characters, growth and yield attributes were significantly affected by the application of GABA, which at 1.0 mg L-1 produced the highest plant height, leaf length, number of leaves, neck and bulb diameter, bulb length, leaf diameter, root length; fresh weight of bulbs, roots and leaves; splitting of bulbs, leaf and bulb yield of onion. GABA at 1.0 mg L-1 was more effective in enhancing growth and yield attributes than 0.5 and 2.0 mg L-1. Application of GABA at 0.5, 1.0 and 2.0 mg L-1 increased the bulb yield by 20.18, 28.09 and 7.02%, respectively. The results suggested that GABA at 1.0 mg L-1 is suitable for onion or any vegetable crop production but GABA at 2.0 mg L-1 may be harmful for plant growth.
  S. Dilruba , M.M.Alam , M.A. Rahman and M.F. Hasan
  The experiment was conducted to investigate the effect of different levels of nitrogen and potassium on yield contributing bulb traits of onion cv BARI Peaj-1. All the bulb traits in the experiment were influenced significantly by the individual treatment of different doses of nitrogen and potassium except dry matter content for nitrogen and showed a positive linear relationship. In the experiment, fresh weight of bulb, bulb dry weight, bulb diameter and yield per plot gave almost two times higher performance (35.29 g, 3.21g, 3.98 cm and 1.68 kg, respectively) by the treatment of 100 kg N ha-1 than that of no nitrogen application (18.93 g, 1.48 g, 2.02 cm and 0.95 kg , respectively). The performance of the doses of potassium (0 kg K2O ha-1 to 120 kg K2O ha-1) on bulb characters and yield of onion was less than that of nitrogen. There was no interraction between nitrogen and potassium in the influence of the expression of the characters. Among the combinations, the treatment 100 kg N with 120 kg K2O ha-1 was found to be the best from overall considerations.
  T.K. Biswas , M.A. Rahman , M.M.H. Khan , M.M. Alam and M. Jahan
  The experiment was conducted in the net house and laboratory to determine the effectiveness of two insecticides viz., Cymbush (Cypermethrin) and Brifer (Carbofuran) on brown plant hopper, Nilaparvata lugens and the toxic action of these insecticides to the predators lady bird beetle, Micraspis discolor and wolf spider, Lycosa pseudoannulata. Effectiveness of the insecticides was assessed on the basis of percentage of corrected mortality of brown plant hopper, lady bird beetle and wolf spider under laboratory condition at 24, 48 and 72 h after treatment. Cymbush 10EC @ 0.05 kg a.i. ha-1. caused 100% mortality of insect populations at different time intervals. All the doses of Brifer 5G caused a good mortality of N lugens at different time intervals and was effective at higher dose. Cymbush 10EC @ 0.04 kg a. i. ha-1. and Brifer 5G @ 0.5 kg a.i. ha-1. were found very effective against N. lugens. The effectiveness of Cymbush 10EC decreased and Brifer 5G increased with increasing time interval. Cymbush 10EC @ 0.05 kg a.i. ha-1. was highly toxic and 0.01 kg a.i. ha-1. was less toxic to both the predators. Brifer 5G @ 0.5 kg a.i. ha-1. was least toxic to the predators. Between the two predators L. pseudoannulata was more susceptible to the insecticides than M. discolor.
  D.K. Biswas , M.M. Haque , A. Hamid , J.U. Ahmed and M.A. Rahman
  A field experiment was carried out to evaluate the growth and yield performance of two blackgram varieties i.e., BARImash 3 and BINAmash 1 under three different population densities. The planting configurations were 40 x 10 cm2, 30 x 10 cm2 and 40 x 5 cm2 representing 25, 33 and 50 plants m-2. Both the blackgram varieties showed identical results in LAI, CGR, NAR, RGR as well as grain yield. But planting density had significant effects on LAI and CGR of the blackgram varieties. The highest planting density showed the highest LAI and CGR but the highest grain yield was recorded from intermediate population density due to the highest number of pods per unit area. The NAR and RGR did not differ due to different population densities.
  S.M. Luthfur Rahman , G.H. Ghose , M.A. Rahman , M.A.I. Khan and M.S. Hossain
  A study on the performance of five genotypes of exotic carambola namely, AC0012, AC0013, AC0014, AC0010 and AC0011 was conducted at the Regional Horticulture Research Station, Akbarpur, Moulvibazar for two years (1998 and 1999). The genotype produced significantly higher plant-1and ha-1 yield over all the genotypes tested. Number of fruits plant-1 was also significantly higher (770.5) in AC0012 than all the genotype except AC0013 (560.5). The genotype AC0012 produced the largest fruit (112.70 g) with maximum size (10.39 x 6.52 cm) while AC0014 produced the smallest fruit (70.75 g) with minimum size (9.16 x 5.28 cm). However, other genotypes produced medium sized fruits ranging from 77.75 to 104.70 g. All the genotypes gave cream fleshed fruits. Texture of flesh of ripe fruit was medium crispy in AC0014, crispy in AC0010 and AC0011 and soft in others. TSS of fruit juice varied from 5.08°B in AC0010 to 7.12° B in AC0012.
  AKM. S. Islam , M.A. Rahman , R.I. Saker , M. Ahiduzzaman and M.A. Baqui
  The energy expenditure under power tiller and bullock farming systems was studied to explore the energy requirement at different stage of rice production and to find out the activity contributed major share of energy. Energy was divided into direct energy and indirect energy. Direct energy included labour, animal and fuel consumption obtained by multiplying energy coefficient. The indirect energy included machinery use, seed, fertilizer, pesticides etc. The direct and indirect energy constituted the total energy requirement expenditure for both farming systems. Intercultural operation was the highest consumer of labour both farming systems as this operation was done manually. In land preparation, power tiller farming system consumed 3 times more energy than bullock farming system but there was a saving of 58% time thus requiring less labour during peak periods. Transplanting operation required energy of 143 MJ ha-1 and 125 MJ ha-1 respectively for power tiller and bullock farming system. Fertilizer and irrigation consumed largest (47-50%) and second largest (21-25%) energy in both the farming systems. Bullock farming system consumed more labour energy (1448 MJ ha-1) than that of the power tiller farming system (1305 MJ ha-1). Total energy requirement under power tiller farming system was 15,751 MJ ha-1 whereas 13,781 MJ ha-1 was consumed under bullock farming system i.e. 17.74% higher energy input was used in power tiller farming system than that of bullock farming system. The grain yield under power tiller and bullock farming systems were 4.87 t ha-1 and 4.12 t ha-1 respectively. The energy ratio of 9.39 and 9.26 were achieved under power tiller and bullock farming systems respectively.
  D.K. Biswas , M.M. Haque , A. Hamid and M.A. Rahman
  A pot experiment was conducted to evaluate the gas exchange, leaf area dynamics and dry matter accumulation of blackgram varieties namely BARI mash 3 and BINA mash 1. The two blackgram varieties did not differ statistically in gas exchange characteristics, leaf area and dry matter accumulation over the growth stages. Blackgram showed highest photosynthesis rate at flowering stage, might be attributed due to higher leaf chlorophyll, higher stomatal and mesophyll conductance and lower intercellular CO2 concentration, but the highest respiration rate was found at pod filling stage. Leaves of top canopy showed highest gas exchange characteristics followed by the leaves of middle canopy and then bottom canopy. Diurnally, photosynthesis increased gradually with increasing intensity of light and peaked at around noon then decreases. Photosynthesis showed strong correlation with leaf area and dry matter accumulation of blackgram.
  A.K.M. Saiful Islam , M.A.S. Kowser Sarker , M.A. Rahman , M.M. Hossain and M.M. Alam
  Production problems of farm machinery are studied in the three major districts namely Dhaka, Comilla and Bogra that play a vital role in supplying farm machinery throughout the country. Most of the manufacturer in the surveyed area has taken farm machinery production as a seasonal business or secondary business due to seasonal demand of farm machinery. Manufacturer gets technical assistance from non-government organizations (NGOs) only. Research stations provided limited range of technical support to the manufacturer. They are not getting financial support from any kind of sources. Production problems are classified as problem before going to production, on going production problem and post-production. Before going to production manufacturer face capital, setting up infrastructure, land, skilled labour, complexity in taking bank loan, political unrest, unhealthy environment, getting electricity connection, bureaucratic complexity and technical know-how of the worker. On going production problems include capital for bulk production, skilled labour, trained technicians, load shedding, double taxation system, raw materials supply, low quality of raw material. Post-production problems are marketing competition with below standard implement of other manufacturer, unauthorized enterprise makes same type of implement of below standard and sold at low price, seasonal demand, ware house, marketing set up, marketing facility. Suggestions in this context are proposed to minimize the problems of producing farm machinery in the country.
  M.A. Rahman , M.A. Rashid , M.A. Salam , M.A.T. Masud , A.S.M.H. Masum and M.M. Hossain
  The study was carried out to identify resistant rootstocks of Solanum species for grafting of cultivated eggplant varieties against root-knot nematode and to evaluate the grafting compatibility of eggplant varieties with wild Solanum root-stocks. Three experiments were conducted in this respect. Six wild Solanum root-stocks were screened against root-knot nematode (Meloidogyne incognita). The root-stocks Solanum torvum and Solanum sisymbriifolium showed resistant reaction against root knot nematode. Fourteen varieties/genotypes were screened against root-knot nematode among which six varieties/genotypes showed resistant reaction. Three cultivated eggplant varieties viz., Sufala, Singnath and Kazla were grafted on Solanum torvum and Solanum sisymbriifolium. The highest grafting success was 95% in case of Solanum torvum with Sufala and the lowest (85%) in Solanum sisymbriifolium with Singnath. The success of grafting was not affected significantly due to the effect of scion and or of root stocks. The grafted plants showed resistant reaction against the disease while the scion plants showed susceptibility in the sick beds. The grafted plants also showed resistant reaction against the disease in the field conditions. The grafted plants also outyielded compared to the scion plants. The grafting combination Solanum torvum with Sufala gave the highest yield compared to other grafting combinations and non-grafted plants.
  M.A. Rahman , S.R. Saha , M.A. Salam , A.S.M.H. Masum and S.S. Chowdhury
  Correlation and path coefficient analysis in onion showed that total bulb yield (kg ha -1) had significant positive correlation with plant height, leaf number per plant, bulb diameter and bulb yield per plant but had significant negative association with plant spacing. Path analysis indicated that bulb diameter, plant height and leaf number per plant were the principal components of yield.
  M. Saiful Islam , M.A. Rahman , M.A. Salam , A.S.M.H. Masum and M.H. Rahman
  An experiment was carried out to study the growth and vegetable pod yield of edible podded pea as influenced by sowing time and spacing. The experiment consisted of two factors, which were three sowing times and six plant spacings. The results revealed that Nov. 23 sown plants showed higher leaf area index, leaf, stem and pod dry matter, plant height and vegetable pod yield than those of Nov. 8 and Dec. 8 sowing. Closest spacing produced the highest LAI, leaf, stem and pod dry matter, crop growth rate, plant height and vegetable pod yield. However, relative growth rate and net assimilation rate were the highest in widest spacing. Regardless of variation in sowing time and spacing, LAI, leaf and stem dry matter, CGR, RGR and NAR increased sharply up to 60 DAE and then declined but pod dry matter increased thereafter. Moreover, plant height increased rapidly up to 60 DAE and then slowly. The highest vegetable pod yield (10.26 t ha -1) was recorded from the Nov. 23 sowing with 30x20 cm2 spacing.
  M.A. Hossain , B.C. Roy , M.A. Rahman , A.I. Khan and A.W. Julfiquar
  On farm trials were established with two advanced hybrid rice lines, IR68877H and IR69690H during the boro season 2000-2001 in five locations-Fakirhat, Babuganj, Bhola sadar, Mothbaria and Nalchhiti upazilla under Bagerhat, Barisal, Bhola, Pirojpur and Jhalokathi districts, respectively. Near each hybrid rice field, BRRI dhan28 and BRRI dhan29 were also transplanted. The varieties BRRI dhan28 and BRRI dhan29 were used as check varieties for IR68877H and IR69690H, respectively. The performance of IR69690H was better than that of IR68877H. The grain yield of IR68877H varied between 6.5 and 9.30 t ha ha-1 with an average yield of 7.85 t ha ha-1 over the locations and that of IR69690H, it was 7.26 to 9.56 t ha ha-1 with an average of 8.25 t ha ha-1 . The average yield advantage of IR68877H over the check variety BRRI dhan28 was 1.41 t ha ha-1 and that of IR69690H over BRRI dhan29 was 1.51 t ha ha-1 . Great variations on grain yield were observed among the sites. The locations Babuganj and Bagerhat were the most productive, whereas the site Mothbaria was the least productive. Majority of the farmers preferred IR69690H, which was later released as hybrid rice variety named as BRRI hybrid dhan1 for Jessore and Barisal region. The farmers chose this line mainly due to its higher yield potential, larger panicle size, low shattering tendency of grain and good appearance.
  M.A. Rahman and C.C. Ainsworth
  Sorrel (Rumex acetosa L.) is dioecious model plant with heteromorphic sex chromosome system with 2n=12+XX in females and 2n=12+XY1Y2 in males. Sex is determined by the X:autosome balance. The major sex determining genes locate on X-chromosomes and the Y-chromosomes are not required for sex expression. Y-chromosomes, which contain genes for pollen fertility, constitute 26% of male genome but the structure and functions of the Ys are largely unknown. AFLP using MseI/PstI digestion reveals very low levels of male specific markers in R. acetosa and related species. Fifteen primer-combinations tested in R. acetosa generated 1085 bands, 4 of which were male specific. Two male associated DNA fragments, MADR1 (583 bp) and MADR2 (133 bp), were isolated and sequenced. These sequences show similarity to short stretches (up to 20-30 bp) of known sequences from several organisms. The deduced amino acid sequence of MADR1 showed similarity to phosphatase genes from Arabidopsis thaliana, while MADR2 showed similarity to retroelement sequences. The generation of very few male specific AFLP markers and their sequence similarity to the stretches of human DNA from autosomes and both the X and Y-chromosomes indicate the likely origin of the Ys from the X-chromosome.
  M.F. Hasan , B. Ahmed , M.A. Rahman , M.M. Alam and M.M.H. Khan
  The study was conducted to analyze the responses of two tomato varieties, BARI tomato-4 and BARI tomato-6 to different environments. The environment used in the experiment were no mulch or control (E0), straw mulch (E1), black polythene mulch (E2), water hyacinth mulch (E3) and am-ada leaf mulch (E4). There were significant influences of different mulches on the growth and yield of tomato. The height of plant, number of leaves, number of main roots, length of roots, fresh and dry weight of roots, number of flower and fruit clusters, number of fruits per plant, weight of fruits and fruit yield per hectare were significantly higher under the environment provided by black polythene mulch. There were also variations in yield contributing characters between the varieties. BARI tomato-6 produced higher yield (55.16 t ha 1) than BARI tomato-4 (51.8 t ha 1). Among the variety-environment combinations the highest yield (61.18 t ha 1) was produced by BARI tomato-6 under the environment of black polythene mulch. This combination also gave the best economic return (BCR = 4.52).
  M.S.H. Reza , C. Mandal , K.A. Alam , A. Salam , M.A. Rahman , M.R. Amin , M.N. Huda , N.C. Ghosh , M.R. Ali and F. Ahmed
  The ethanol extract of leaves of Hoya parasitica was tested for its phytochemical groups, antibacterial and antinociceptive activities. The ethanol extract showed the presence of flavonoids, reducing sugars, tannins, gums and saponins. The extract showed moderate antibacterial activity against both gram-positive and gram-negative bacteria. It also produced significant (p<0.01) writhing inhibition in Swiss albino mice at oral dose of 500 mg kg-1 body weight comparable to the standard drug diclofenac sodium.
  M.A. Rahman , M.N. Amin , M.S. Islam , M.M. Begum and M.A. Uddin
  Air layering on five different times with the help of indole butyric acid (IBA) at 1000, 1500, 2000, 2500, 3000 and 3500 ppm concentration was evaluated in BARI-1 variety of litchi. Five different dates of layering were 15 May, 01, 16 June, 01 and 16 July. It was observed that the number and average length of primary roots and survival of layers were markedly increased where layers were prepared on 01 and 16 June. Layers prepared with IBA at 2500 ppm produced the maximum number (27.14) and length (6.69 cm) of primary roots and obtained the highest percentage (77.66%) of success in the survivability of litchi layers. The best rooting performance and the final survival of air layers in the nursery after 90 days of severing was recorded to be the highest (90%) where layers were prepared on 16 June with IBA at 2500 ppm.
  M. H. Rashid , M. Atikuzzaman , M.A. Rahman , M.A. Hoque and M.Y.E. Chowdhury
  The present study was carried out during a period of four months at Central Disease Investigation Laboratory, Dhaka with the primary aim to measure the frequency of Gumboro in poultry based on sample submission and diagnostic protocol they have been using for poultry disease surveillance. The birds >30 days had a more frequency of Gumboro and the mortality was also comparatively higher in these group (15.66 risk ratio and 4.65 rate ratio). BV 300 strain was affected at a relatively higher rate and among the production group layer was evidenced to be more susceptible than broiler to IBD infection.
  B.C. Roy , M.A. Hossain and M.A. Rahman
  Field experiment was conducted at the Bangladesh Rice Research Institute, Charbadna farm, Barisal, from boro 2001 to aman 2002. Seven photoperiod-sensitive rice varieties including three fine grain aromatic varieties were transplanted in December 15 and December 30, 2001. After harvest of boro crop the ratoons, came out from the remaining straw and base of the hills, were allowed to grow and in the succeeding aman a good harvest was obtained from those ratoons. In the boro season, the highest yield was obtained from BRRI dhan41 followed by BR23 (7.51 and 7.06 t ha-1, respectively). The yield of aromatic varieties was about 5 t ha-1. The ratoon-yields of both aromatic and non-aromatic varieties in the succeeding aman season were also encouraging and produced about 2 t ha-1, which was more than the average yield of local varieties normally cultivated in the transplanted aman season in that region. The highest yield was obtained from BR23 (2.87 t ha-1) followed by BRRI dhan37 (2.63 t ha-1). From this experiment, it was revealed that the photoperiod-sensitive rice varieties could be planted in the early boro season and the ratoons from this crop also produced a good harvest, might be a low-cost rice cultivation technique in those areas, where crop establishment in the transplanted aman season is somewhat difficult due to early intrusion of tidal water in the field at the end of boro season.
  M.S.H. Bhuiyan , M.A.K.Azad , M.K. Hossain , S. Ahammed , M.R. Rahman , B. Mondal , M.A. Rahman and M.A. Wahab
  The experiment was conducted in Itna Upazila, Kishoreganj from July 2001 to June 2002. It has included survey of waterbodies, implementation of different management policies and affect of aquatic environmental issues on hoar fisheries in Itna Upazila, Kishoreganj. There are 16 hoars in Itna Upzila which were comprising of 83 jalmohals. Three management policies including revenue- based leasing system in 93% area of jalmohal, NFMP in 7% area of jalmohal with fisheries resources development project including sanctuary, have been practiced in Itna. Aquatic environmental degradation by siltation, submersible roads and flood control embankments, deforestation, conversion of water body into agricultural land, use of agro-chemicals and surface water abstraction for boro crop, social and political unwanted influence were creating a great threat to fisheries sustainability. It has been suggested that government should emphasize the sustainable haor fisheries development by implementing community-based management practices as part of an integrated holistic development plan of the haor areas.
  M.A. Hoque , H.M. Salim , G.K. Debnath , M.A. Rahman and A.K.M. Saifuddin
  To evaluate the success rate of artificial insemination and average service required per conception of cows inseminated in different AI points of sub centers under Chittagong and Cox’s Bazar District of Bangladesh, last three years AI records were analyzed and interpreted. The lowest and highest conception rates in different points under Pahartali sub center were recorded to be 55 and 73%, respectively during 1998-1999; the same results being obtained during 1999-2001; 55 and 66%, respectively during 2000-2001. The lowest and highest average services required per conception of cows inseminated in these points was 1.3 and 1.8, respectively. On the contrary the lowest and highest conception rates were 41 and 42% during 1998-99 and the following year (1999-2000) with an improvement to 46 and 55 % during 2000- 2001 period, respectively in points under Shandip sub-center. The lowest and highest average service per conception were between 1.8 and 2.4 during the said period. The lowest and highest conception rate and average service per conception were obtained from different points of Cox’s Bazar sub center where 59 and 64%, 50 and 72%, 50 and 77% conception rates; and 1.6-1.7, 1.4-2.0, 1.3-2.0 average services per conception during the period of 1998-1999, 1999-2000 and 2000-2001 were recorded, respectively. These differences were proved to be statistically significant. The difference in successful conception rates between Shandip and Pahartali Sub center; and Shandip and Cox’s Bazar sub center during 1998-1999, 1999-2000, 2000-2001 period were also found statistically significant. However, as the overall (1998-2001) conception rates were compared between Shandip and Pahartali and Shandip and Cox’s Bazar, there were shown statistically insignificant. The overall conception rates and average services per conception to the animal of 1998-2001 were found to be significant as well.
  M.A.I. Khan , M. S. Hossain , M.A. Rahman , S.M. Jobair Hossain and G.M. Mujibar Rahman
  The effectiveness of solar heat in controlling seed borne fungal infections of wheat was tested by drying of seeds on concrete floor, brown paper and mixing with sand (50:50) for 0, 4, 8 and 12 hours. It was observed that the seeds dried with sand mixture always yielded lowest number of seed borne infections of all the fungi followed by concrete floor and brown paper. Reduction rate of fungi achieved in all the treatments differed significantly from that of control. Twelve hours was the best period in inhibiting the seed borne infections. However, in some cases both 12 and 8 hours treatments behaved equally. Reduction of total seed borne infection and increase in seed vigour positively correlated with the increase in drying period. Therefore, to minimize the seed borne infections, it would be advisable to use seed dried with sand mixture for 12 hours under direct solar heat.
  M.E. Haque , M. Rahman , M.A. Rahman , A.K. Roy and B. Sikdar
  Institute of Biological Science, University of Rajshahl, Rajshahi 6205, Bangladesh Department of Genetics and Breeding, University of Rajshahi, Rajshahi 6205, Bangladesh Fruit Research Station, BARI, Binodpur, Rajshahi, Bangladesh. A field experiment on lablab bean based intercropping system was conducted at the Botanical Garden of Rajshahi University during the winter of 1999-2000 and 2000-2001. The experiment was conducted in with sole lablab bean and other crops as like as lettuce and spinach and their intercropping combinations. The yield and yield components of lablab bean were influenced by intercrops and the lablab bean JessoreI/lettuce intercropping in 1:1 ratio gave the highest monetary return and land equivalent ratio (LER) of 2.00. The yield advantage was more in intercropping than all sole cropping systems, except when it was intercropped with spinach.
  M. Mahbubul Alam , Md. Mainul Basher , A. Karim , M.A. Rahman and M. Rafiqul Islam
  An experiment was conducted during the period from April to July 2001 to find out effect of 3 levels of plant population (53000, 66000, 80000 plants ha-1) and 4 levels of nitrogen fertilizer (100, 140, 180 and 220 kg ha-1) in silty clay loam soil. The results showed that the yield and yield attributes characters varied significantly due to the variation in population densities and nitrogen rates. The lower plant population (53000 plants ha-1) produced higher cobs plant-1, cob length, grains cob-1 and 1000-grain weight, but the higher plant population (66000 and 80000 plants ha-1) resulted significantly higher grain yield than lowest plant population. The increasing level of nitrogen improve the yield and yield attributes. Maximum values of yield attributes and that of grain yield were with the 2nd highest level of nitrogen (180 kg N ha-1). The highest grain yield (5.03 t ha-1) was recorded from 80000 plants ha-1 with 180 kg N ha-1.
  M.M. Rahman , K.M. Khalequzzaman , T.K. Day , M.A. Rahman and Md. Kalim Uddin
  The experiment was conducted during 1996-97 and 1997-98 crop season with a view to determine the effectiveness of two systemic fungicides as seed treatment against late blight of potato caused by Phytophthora infestans. Potato seeds were used as whole and cut tuber and fungicides were applied on seed as dipping and spray. There were 10 treatments, each having three replications. Among the treatments, T1 (Whole+Ridomil dip.) appeared the best, which+ exhibited delaying on disease appearance, reduced foliage blight and increased yield significantly over control.
 
 
 
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