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Articles by M. Jahiruddin
Total Records ( 4 ) for M. Jahiruddin
  M.N. Huda , M.R. Islam and M. Jahiruddin
  An investigation was undertaken to evaluate suitable extractant(s) for available sulphur and critical limits of sulphur for wetland rice soils of Bangladesh. Some 22 soils from 0-15 cm depth were collected from different locations of Old Brahmaputra Floodplains of the country. Sulphur in the soils was extracted with four different extractants, MCP (500 ppm P), CaCl2 (0.15%), NH4OAc (0.5 M) and NaHCO3 (0.5 M). Rice plants were grown in pots treated with and without S for eight weeks. At harvest dry matter of rice was recorded. The critical level of S was determined by both graphical and statistical methods. The extractable S of the soils varied considerably with the soils and the extractants used. The ability of the extractants to extract S followed the order: 0.5 M NH4OAc > 0.5 M NaHCO3, >0.15% CaCl2 > MCP. The MCP extractable S showed significant and positive correlation with organic matter, available P and exchangeable K contents but was significantly and negatively correlated with soil pH. The amount of extractable S by other methods did not show any significant correlation with soil properties. The extractable S by any pair of extractants viz., CaCl2 vs NH4oAc, CaCl2 vs NaHCO3 and NH4oAc vs NaHCO3 were significantly and positively correlated. The critical levels of MCP, CaCl2, NaHCO3 and NH4OAc extractable S were 9.3, 9.7, 15.8 and 17.8 mg kg-1, respectively in both graphical and statistical methods for rice. The critical limit for plant S was found to be 0.12% at 56 days of crop growth.
  M.R. Islam , M. Jahiruddin and S. Islam
  The levels of arsenic in irrigation waters (STW), soils and rice plants (grain and straw) in five districts viz., Pabna, Chapai Nawabganj, Rajbari, Faridpur and Gopalganj of the Gangetic floodplains of Bangladesh were assessed during the year 2001. The arsenic concentrations for all samples (soil, water, grain and straw) varied considerably between locations. Generally, the arsenic levels in soils and waters were higher in Rajbari and Faridpur compared to the other three districts. There was a good correlation between water-As and soil-As over the locations. None of the soils had arsenic level more than 20 μg g-1 (the maximum acceptable limit for agricultural soils). About 16% grain samples had no detectable As and on the other hand 14% grains had As level more than 1 ppm. Comparing varietal effects, the grain As concentration in IR 8 and BRRI dhan 29 rice were higher in comparison with BRRI dhan 28 and Parija. There was no correlation between rice grain As and soil As content. The As concentrations were always lower in grain than in straw.
  M.R. Islam , S. Islam , M. Jahiruddin and M.A. Islam
  A pot culture experiment was carried out at Bangladesh Agricultural University (BAU), Mymensingh to see the effects irrigation water arsenic (As) on Boro rice (February to June) and the residual effect on T. Aman rice (August-November). There were eight treatments consisting of Control, 0.10, 0.25, 0.50, 0.75, 1.00, 1.50 and 2.00 ppm As added through irrigation water. A total of 56 L of irrigation water having different concentrations of As was needed for the Boro rice (Cv. BRRI dhan 29). After harvest of Boro rice, T. Aman rice (Cv. BRRI dhan 33) was grown in the same pots with monsoon rain. Nutrients such as N, P, K and S @ 100, 25, 40 and 25 ppm, respectively were added to sustain normal growth of both Boro and T. Aman rice. The irrigation water added As up to 0.25 ppm enhanced the plant height, panicle length, filled grains/panicle, 1000-grain weight and finally the grain yield of Boro rice and the further doses of depressed the plant growth, yield and yield components. The concentration of As in rice grain or straw of Boro rice increased significantly with increasing As concentrations in the irrigation water, the values for grain As for every As treatment were below the Maximum Permissible Level (1.0 ppm). Application of As added to the first crop (Boro rice) had significant residual effects on the second crop (T. Aman rice) in respect of plant height, panicle length, grains/panicle, grain and straw yields. Arsenic concentrations were always higher in Boro rice grain and straw compared to T. Aman rice. The grain As of Boro rice was almost double the As levels in T. Aman rice grain over the treatments. The As treatments had an adverse effect on the N, P, K and S concentration of rice grain.
  Rehana Banu , M.H. Mian , M. Jahiruddin and M.A. Hasan
  A field experiment was carried out at the Bangladesh Agricultural University Farm, Mymensingh, Bangladesh during Boro season of 2000 to evaluate the comparative effect between one or two layers of incorporated Azolla biomass from 0.2 and 0.1 kg m‾2 inoculum with 50 kg N ha-1 as urea and the recommended dose of N (100 kg ha-1) on the yield and NPS uptake of BRRI Dhan 29. All the treatments were tried in two different plant spacings i.e., S1: 25-25×15 cm and S2: 35-15×15 cm. The highest grain yield of 4.43 t ha-1 produced by two incorporations of Azolla @ 0.2 kg m‾2 inoculum with 50 kg N ha-1as urea, which differed significantly from 4.06 t ha-1yield produced by 100 kg N ha-1 as urea (the recommended dose). But the yield of 3.88 t ha-1produced by twice incorporation of Azolla @ 0.1 kg m‾2 inoculum with 50 kg N ha-1 as urea and the yield from one incorporation of Azolla @ 0.1 and 0.2 kg m‾2 inoculum plus 50 kg N ha-1 as urea (3.65 and 3.91 t ha-1, respectively) did not differ statistically with that of 100 kg N ha-1as urea. The lowest grain yield of 2.26 t ha-1 was recorded from the control. The nitrogen, phosphorus and sulfur (NPS) uptake in grain and straw increased significantly by about 40-84, 45.3-109 and 41-87%, respectively, due to incorporation of Azolla over control. The difference between two plant spacings was not significant. Interaction effect between plant spacing and Azolla-urea treatments also did not exhibit any significant variation.
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