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Articles by M. Hasinur Rahman
Total Records ( 4 ) for M. Hasinur Rahman
  M. Hasinur Rahman , T.A. Adjadeh , H. Saitoh and S. Saiga
  In this study, it is hypothesized that plants selected and/or bred for improved desired characteristics (e.g., macronutrients) may affect other characteristics (e.g., micronutrients) negatively. To test the hypothesis, we evaluated the metal micronutrient concentrations of four experimental strains viz., HighMgE, HighMgM, LowEq and LowMg and two commercial cultivars viz., Okamidori and Akimidori of orchardgrass. There were no genetic differences among the experimental strains/cultivars of orchardgrass for dry matter accumulation. The concentration of micronutrients varied with genetic differences among the four strains and the two commercial cultivars of orchardgrass. The amounts of Mn, Fe, Zn, Cu, Mo, Co, Ni, Se and I in the shoot, irrespective of strain or cultivars used, were 76.36, 74.83, 14.03, 9.36, 2.19, 5.00, 5.17, 2.00 and 19.33 μg g-1 at first harvest and 85.89, 74.56, 15.06, 12.30, 3.84, 6.14, 4.99, 2.54 and 19.53 μg g-1 at second harvest, respectively. The average amounts at the third harvest were 119.97, 90.36, 17.67, 13.39, 3.36, 4.56, 4.89, 2.36 and 20.06 μg g-1, respectively, whereas the corresponding amounts at the fourth harvest were 128.22, 156.00, 21.92, 10.31, 4.25, 4.53, 4.54, 1.47 and 28.72 μg g-1, respectively. Apart from few exceptions, Mn, Fe, Zn, Mo and I levels were highest in the fourth harvest, whereas the levels of Co and Se were highest in the second harvest. The level of Cu was the highest in the third harvest. The levels of Mn, Fe, Ni, Se and Mo were higher in low Mg containing plants irrespective of strain or cultivar. On the other hand, Co, Cu and I tended to peak in plants containing higher amounts of Mg. The Cu/Mo ratio was highest in the first harvest followed by the third, second and fourth harvests. The amounts of Mn, Fe, Ni, Co, Zn and Mo were within the optimum levels required for maintaining forage quality.
  M. Hasinur Rahman and S. Saiga
  The objectives of this study were to compare K, Ca and Mg utilization and grass tetany potential among the high and low magnesium containing strains and commercial cultivars of orchardgrass in response to application of dairy manure and chemical fertilizer. The study was conducted from 2002 through 2003 in northern Honshu Island, Japan on sandy loam Andisol. Highest plant dry matter production was recorded with the application of chemical fertilizer. Soil properties varied with application of manure. Potassium concentration in shoot tissue increased from 2002 to 2003 in all the treatments irrespective of strains and cultivars. However, calcium concentration in shoot tissue decreased from 2002 to 2003 in all the treatments irrespective of strains and cultivars. High magnesium containing strains almost showed low potassium and high magnesium and calcium concentrations in all the treatments. Concentrations of K, Ca and Mg in shoot tissue were highest as a result of dairy manure application and lowest by chemical fertilizer application. The grass tetany potentials were higher in 2003 than 2002. The grass tetany potential was lowest in all the cultivars and strains during fertilization with chemical fertilizer. High magnesium containing strains were less grass tetany prone than the others irrespective of treatments. The correlations between equivalent ratio and K were significantly positive; the correlations involving equivalent ratio, Ca and Mg were negative, however, regardless of treatments and years.
  M. Hasinur Rahman , Atsushi Okubo , Shigenao Kawai and Shu-ichi Sugiyama
  Several biochemical and molecular methods are used to investigate the microbial community structure and microbial diversity in soils. Biochemical (Phospholipid fatty acid: PLFA profiles) and molecular (Denaturing gradient gel electrophoresis of polymerase chain reaction amplified DNA: PCR-DGGE) fingerprinting methods were employed to quantify soil microbial community in Andisol differing in management practices. No-tillage (NT) soil had significantly higher microbial biomass carbon and microbial biomass nitrogen than conventional tillage (CT) soil. PLFA for gram-positive bacteria, gram-negative bacteria, aerobes, cyanobacteria and fungi were significantly higher in NT than CT. On the other hand, PLFA for sulfate-reducing bacteria, methane-oxidizing bacteria and mycorrhizae were significantly higher in CT than PD and NT. The total DNA extracted from Andisol with differing management practices ranged from 21.0 to 33.0 μg g-1 soil. Soil DNA yielded from puddling (PD) showed highest amount and NTg showed lowest amount. There were no significant variations in DNA yield obtained from Andisol of CT and NTg. Highest bacterial diversity evaluated by DNA band number in DGGE analysis based on PCR amplification of 16S rDNA fragments was observed in PD and can be arranged as: PD>CT>NT. On the other hand, highest fungal diversity evaluated by DNA band number in DGGE analysis based on PCR amplification of 18S rDNA fragments was observed in NT and can be arranged as: NT>CT>PD. Results indicated that microbial community was responsive to management practices demonstrating their usefulness as indicators of soil quality in temperate Andisol.
  M. Hasinur Rahman
  Background and Objective: Agricultural activities release three primary greenhouse gases to atmosphere which are responsible for climate change. Soil, a natural capital is considered as a big reservoir of carbon dioxide (CO2). Irrigation may or may not change soil carbon in a desirable direction. It is, therefore, important to evaluate soil carbon in irrigated soils. The objective of this study was to evaluate the influence of irrigation on soil carbon dynamics in a tropical calcareous soil under rice-based cropping systems. Materials and Methods: Soil organic and inorganic carbon stock and their stratification were evaluated from three soil series located in same catena of Ganges-Kobadak (G-K) irrigation project as well as adjoining non irrigated area of G-K soils which were calcareous in nature. Two-way analysis of variance (ANOVA) was undertaken for all factors. All statistical analyses were performed by JMP 4.0 (SAS Institute, Cary, North Carolina, USA). Results: Soil organic carbon (SOC) was increased due to long-term irrigation in calcareous soils irrespective of soil depth and series. The research showed the significant loss of soil inorganic carbon (SIC) under irrigated condition compared to non irrigated condition regardless of soil series. Soil organic carbon density was lower in coarse textured soils than fine textured soils while in case of SIC it was higher in coarse textured soils than fine textured soils, regardless of management practices and soils. The potential SOC stock was higher in non irrigated soils than irrigated soils and the reverse was true for the SIC. Stratification ratios of SOC under irrigated soils were significantly higher than under non irrigated soils. On the other hand, the stratification ratios of SIC was significantly lower under irrigated soils than under non irrigated soils. Conclusion: Results indicated that irrigation practices may slightly increase SOC but remarkable decrease SIC in calcareous soils.
 
 
 
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