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Articles by M.Z. Alam
Total Records ( 8 ) for M.Z. Alam
  I.M. Rafiqul , K.C.A. Jalal and M.Z. Alam
  The study attempts to investigate the contribution of selecting optimal environmental factors as optimal temperature, light and pH condition obtained from previous experiments for growth and biochemical changes in S. platensis and S. fusiformis. Zarouk medium was used for the experiment in distilled water. For S. platensis, temperature was adjusted to 32°C, light to 2500 lux and pH 9 while for S. fusiformis, temperature was adjusted to 37°C, light to 2500 lux and pH 10. The specific growth rate and biomass of both S. platensis and S. fusiformis achieved in the present study are significantly higher than those achieved in previous cultures (p<0.05). Protein content of S. platensis was 58.6%. This value is vaguely lower than that achieved in previous experiments and the difference is not statistically significant. Protein content of S. fusiformis was 61.8%. This value is significantly higher (p<0.05) than that attained in temperature effect culture but statistically same to pH and light effect culture (p>0.05). These results suggested that favorable environmental conditions during Spirulina culture could be instrumental for good biomass production and protein production as well.
  S.A. Haider , M.Z. Alam , M.F. Alam and N.K. Paul
  A field investigation was carried out to study the influence of sowing dates on phenology and accumulated heat units of four cultivars of bread wheat (Triticum aestivum L.) at different phenological stages over two growing seasons. There were two sowing dates: early and late. The late sown plants had significantly shorter phenological stages and lower growing day degree than the early sown plants in all the four cultivars. Cultivars Akbar was found to be early and C 306 was found to be late maturing. Akbar had the lowest and C 306 had the highest growing degree days during all the phenological stages under each irrigation regimes. Heliothermal units also showed more or less the same trends. The phenothermal indices and heat use efficiency were found to be higher in the early sown plants than the late sown plants.
  M.J. Islam , G. Mowla , S.S. Parul , M.Z. Alam and M.S. Islam
  A study of cracking soils management was conducted in the wet soil bin with nine soil management practice treatments to investigate their impact on infiltration rate. The treatments were arranged in a randomized complete block design (RCB) with three replications. It is observed that the management of cracking soils, even at an early stage of crack initiation, has a great influence on infiltration rate. Among the management practices, the hand hoe operation was found to be better than trampling to reduce the cracks when the crack width was 10 mm. It is also observed that there is no influence of crack number on infiltration if a soil management practice is included with irrigation. The study reveals that with a soil management practice, the cracks reduced or were removed in a short period of time even though the cracks were 10 mm wide. In contrast, without soil management, cracks remained open for a long period even after ponding. By practicing soil management during irrigation, a large volume of water can be saved which my help to bring more area under irrigation particularly where there are limited water resources.
  M.M. Rashid , M.Z. Alam , M. Mofazzel Hossain , M. Ibrahim and M.H. Kabir
  The present study was carried out to investigate indirect damage of guava leaf in the form of wax and honeydew covering by the spiraling whitefly (Aleurodicus dispersus) was investigated in a guava orchard, Mymensingh, Bangladesh. Extent of leaf damage in twigs of different strata indicated that the upper most twigs had minimum wax and honeydew-covered leaves than the other twigs of guava plants. The results of the study on variation of leaf damage in different leaf position of twig showed that at early attacking stage the mean percentage of wax and honeydew covered leaves, was significantly higher in upper leaf position than in the middle and the lower leaf position and had the lowest level of whitefly infestation in the lower leaf position of the guava twigs. Results showed that with the build up of population in the month of December and January, wax and honeydew covered leaves were more in middle leaf position. The lower wax and honeydew covering in upper position were recorded in the later months due to rain and rapid growth of new flush, which remained non-infested.
  M.Z. Alam , M.A.A. Bhuiya , M.A. Muttaleb and M.M. Rashid
  A pot experiment in glasshouse was conducted with a single salinity level of 10.5 dS m-1 to study the effect of alternating saline and non-saline conditions on emergence and seedling growth of two rice cultivars (IR8 and V3) differing in salt tolerance. A split-plot design was used with three replications. The results demonstrated that rice seedlings, 1 to 3 weeks after emergence, proved to be very salt-sensitive. There was about 80% reduction in stand establishment in 10.5 dS m-1 salt (about 115 mM ) imposed for just one week. Maintaining rice seeds in saline conditions from seeding resulted in 50-70% initial seedling emergence. However, most seedlings then died within 14 days and by 42 days, only 5% or less survived. Though substantial differences existed between cultivars during germination and emergence, cultivar differences during post-emergence growth were minimal. Little improvement in stand establishment and seedling growth was achieved by ameliorating an initial exposure to salt by transferring to water after 21-35 days. The results demonstrated a gradual decrease in seedling mortality with later exposure to salt. There was little effect on stand establishment and other plant growth parameters when saline solution was introduced 35 days from seeding. Tolerance to a given salt concentration during germination and emergence of rice was not accompanied by the plants tolerance to that particular salt concentration at later stages of growth.
  M.Z. Alam , S.A. Haider and N.K. Paul
  A field investigation was carried out to study the influence of irrigation on phenology and accumulated heat units of four cultivars of bread wheat (Triticum aestivum L.) at different phenological stages over two growing seasons. There were three treatments: rainfed, 10 and 20 mm irrigation. The rainfed plants had significantly shorter phenological stages and lower growing day degree than the irrigated plants in all the four cultivars. Cultivars Akbar was found to be early and C 306 was found to be late maturing. Akbar had the lowest and C 306 had the highest growing degree days during all the phenological stages under each irrigation regime. Heliothermal units also showed more or less the same trends. The phenothermal indices and heat use efficiency were found to be higher in the irrigated plants than the rainfed plants.
  K.U. Ahmed , M.M. Rahman , M.Z. Alam and S.U. Ahmed
  A survey on farmer’s pest control methods and direct yield loss assessment of country bean (Dolichos lablab) was done during September 2000 to February 2001 in North Edilpur and South Mohadebpur villages of Sitakundu under Chittagong district. Results revealed that farmers used Fanfan, Nogos, Ripcord, Malathion, Roxion and Sumithion as chemical methods and applying ash and handpicking of insect pests as non-chemical method to control insect pests. The frequency of insecticide application during flowering stage to harvest was 9 to 15 with waiting period of only 3 to 20 days and 6 to 12 with waiting period of 3 to 25 days in North Edilpur and South Mohadebpur, respectively. The pod infestation by pod borer and aphids varied from 2.29 to 5.12% and from 2.83 to7.16% in North Edilpur and South Mohadebpur, respectively. Insect pests thus caused direct yield loss of 60.38-200.69 kg ha-1 in North Edilpur and 92.63-345.80 kg ha-1 in South Mohadebpur.
  F. Kabir , M.S. Sultana , M. Shahjalal , M.J. Khan and M.Z. Alam
  The experiment was conducted to determine the effect of protein supplementation on growth performance in female goats and sheep. Ten does and six ewes aged about 15 months and weighing on average, 13.9 and 14.4 kg respectively were studied in this experiment. Animals were allocated to two feeding regimes [low protein (LP), 168g and high protein (HP), 208g per kg DM] in a randomized block design according to live weight. HP diet did not significantly (p>0.05) increase live weight gain (33.0 vs. 25.2 g/d) in goats. In contrast, sheep received the HP diet significantly (p<0.05, p<0.01) improved DM intake (509.0 vs. 425.9 g/d) and live weight gain (36.6 vs. 10.7 g/d) compared to those given the LP diet. These results indicate that supplementary feeding of high protein diet (208g CP per kg DM) significantly increased growth performance of sheep under grazing condition.
 
 
 
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