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Articles by U.A. Naher
Total Records ( 4 ) for U.A. Naher
  U.A. Naher , O. Radziah , M.S. Halimi , Z.H. Shamsuddin and I.M. Razi
  A study was conducted in in vitro condition to determine the specific growth rate, sugar consumption and generation time of four diazotrophic bacterial species, Burkholderia, Rhizobium and two Corynebacterium sp. in four different carbon substrates. Growth of all bacterial strains was significantly affected by the sugars. Burkholderia sp. (Sb13) rapidly attained maximum population in glucose, fructose and sucrose and the specific growth rate best fitted with exponential model. The cell generation times of Burkholderia sp. (Sb13) in glucose, fructose and sucrose substrate were 0.4, 0.55 and 0.1 h, respectively. Rhizobium sp. (Sb16) followed an exponential growth model in fructose and its generation time was 0.62 h. The growth of Corynebacterium sp. (Sb26) was higher in arabinose and followed logarithmic growth model with generation time of 0.68 h. Corynebacterium sp. (Sb35) showed faster generation time (1 h) in sucrose substrates and the specific growth rate in all four carbon substrates followed logarithmic model of growth phase. Burkholderia sp. and Corynebacterium sp. (Sb26) consumed 100% of arabinose after 36 h of incubation period. The total sugar consumption by the diazotrophs were higher in logarithmic model of growth phase compared to exponential, power and polynomial model.
  U.A. Naher , M.A. Hashem , M.K. Uddin , M. Ahmed and M.A. Saleque
  A study was undertaken to determine the oxidizable organic carbon mineralization rate of cowdung (CD) and poultry manure (PM) alone and with combination of rice straw (RS) and lime under covered condition. The oxidizable organic carbon mineralization rate followed the first order kinetics and was best in logarithmic model of (Co-Ct) vs. t. The carbon mineralization rate was higher in the PM than CD. The application of rice straw reduced mean mineralization rate of both CD and PM and it increased by liming. The cumulative carbon dioxide evolution flux was higher in CD (854 mg kg-1) followed by CD + RS (828 mg kg-1) and CD + lime 1 1 treatments (780 mg kg-1). The carbon dioxide evolution rate was high up to 20 days in the CD and CD + lime 1 treatments and in the PM it was high up to 30 days. The cumulative carbon dioxide evolution rate was higher in CD treatments than PM treatments. The mineralization rate became steady after 45 days in CD and 60 days in PM treatment so within this period it is mature enough for field application. The addition of lime increased half-life of cowdung and poultry manure. The lowest half- life (19 days) obtained from PM + lime treatment.
  U.A. Naher , M.A. Hashem , B.K. Mitra , M.K. Uddin and M.A. Saleque
  A pot study was conducted at greenhouse to measure the P and K mineralization rate from fulvic acid with fresh poultry manure, partially decomposed cowdung, rice straw and lime under covered and uncovered condition. The decomposition period was 90 days. Initially the cowdung contain 127 ppm of fulvic acid P and 2.23 meq /100 g of fulvic acid K whereas the poultry manure contain 378 ppm of fulvic acid P and 13.4 meq /100 g of fulvic acid K. The P and K immobilization takes place after 15 days of decomposition and with the passing of time it increased gradually. The lime addition increased P concentration in cowdung treatments and the highest of 1505 ppm of fulvic acid P was recorded at 75 days of decomposition in the covered cowdung + lime treatment. The addition of rice straw increased K concentration in both cowdung and poultry manure treatments but it decreased the mineralization rate. The highest of 67 meq /100 g of fulvic acid K was mineralized at 75 days of decomposition in the uncovered poultry manure + rice straw treatment. The fulvic acid P mineralization was higher in the covered cowdung and poultry manure treatments. The fulvic acid K mineralization was also high in the covered cowdung treatments but in the poultry manure treatments it was higher in the uncovered treatments.
  U.A. Naher , O. Radziah , M.S. Halimi , Z.H. Shamsuddin and I. Mohd Razi
  An experiment was conducted in axenic condition to study the effect of Corynebacterium sp. (Sb26) and Rhizobium sp. (Sb16) inoculation on the root exudates carbon sugars and amino acid production in three different rice (Oryza sativa) genotypes. A total of seven carbon sugars and 16 amino acids were determined from the Mahsuri, Mayang Segumpal and MR219 rice root exudates. The concentration of root exudate sugars, amino acids and its released pattern were significantly different with rice genotypes. Mahsuri released the highest sugar (25.73%) followed by MR219 and Mayang Segumpal (23.14% and 20.85% of plant dry wt.) rice, respectively. Inoculated plants produced different amount of sugar and amino acids in the presence of diazotrophs compared to non inoculated plants. Mahsuri rice inoculated with Corynebacterium sp. released the highest amount of fructose (791 μmol g-1 root dry wt.) and arabinose (640 μmol g-1 root dry wt.). Mayang Segumpal rice inoculated with Rhizobium sp. produced the highest amount of sucrose μmol g-1 root dry wt in the root exudate. A significantly higher amount of glycine and isoleucine were detected in the inoculated root exudates of all rice varieties. However, inoculation enhanced production of sugars and amino acids in root exudates. In general rice genotypes inoculated with Rhizobium sp. produced higher amount of total sugars and amino acids in root exudates compared to that of Corynebacterium sp.
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