Abstract: 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.