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Articles by M.A. Saleque
Total Records ( 3 ) for M.A. Saleque
  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 , 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.
  N.C. Shil , A.R.M. Solaiman , M.N. Anwar and M.A. Saleque
  A laboratory experiment was conducted at Bangladesh Rice Research Institute in 2001 to know the phosphorus-releasing pattern of soils in repeated extraction and to find out the effects of organic and inorganic amendments on solution P releasing power of soils under submerged condition. Three composite soil samples (0-15 cm) were collected from the cultivated rice field of Sreepur, Gazipur (Aeric haplaquept) (pH 4.8), BRRI Farm, Gazipur (Vertic haplustept) (pH 6.2) and Benerpota, Satkhira (Haplaquept) (pH 7.5). The soils were different in texture, organic matter and available P content. The soil samples were incubated under submerged condition in plastic pots amending with cowdung (CD) and Poultry Manure (PM) each at the rate of 5 g kg-1, Triple Super Phosphate (TSP) 12.5 mg kg-1 and a control with out any amendment. Taking 3 replications the pots were placed in the laboratory under room temperature (28±2°C) in Completely Randomized Design (CRD) arrangement. At the 3rd week after incubation, the release of solution P (extracted with 0.01 M CaCl2) was determined with repeated extraction for 8 times. In all the soils, the concentration of solution P in poultry manure amended sample was greater than the others. The release of solution P was not much influenced by the soil amendment. The solution P in the first extraction was found highest in all treatments, which gradually decreased in subsequent extraction but from 4th to 8th extractions, the P was found identical. The total amount of solution P released in 8 extractions was found highest with poultry manure amendment yielding 0.24, 0.13 and 0.10 ppm for Satkhira, BRRI and Sreepur soil, respectively. The contribution of cowdung and TSP was almost identical in the tested soils and was lower than poultry manure treated samples. The exponential relationship between solution P and number of extraction hold good for all three soils. The co-efficient of determination (r2) of the exponential equation for BRRI soil was 0.8571 to 0.9404 (p<0.005) followed by Satkhira soil 0.8487 to 0.899 and the lowest in Sreepur soil 0.767 to 0.8781.
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