A. T. M. M. Kamal
Department of Soil, Water and Environment, University of Dhaka, Dhaka-1000, Bangladesh
M. M. Islam
Department of Soil, Water and Environment, University of Dhaka, Dhaka-1000, Bangladesh
M.S. Hossain
Department of Soil, Water and Environment, University of Dhaka, Dhaka-1000, Bangladesh
S. M. Ullah
Department of Soil, Water and Environment, University of Dhaka, Dhaka-1000, Bangladesh
Sewage sludge, Rice grain yield, Mineral contents
Department of Soil, Water and Environment, University of Dhaka, Dhaka
Crop-Soil-Water Management
The experimental soil (0 - 15 cm depth) was collected from low lying area of Zirani, Savar, Dhaka. Dried sewage sludge (SS) was collected from Dhaka WASA sewage treatment plant, Pagla, Narayanganj. The collected soil and sewage sludge samples were air-dried, ground and sieved through a 2 mm sieve for physical analysis. Total N, P, Na, K, Ca, Mg, Fe, Cu, Zn, Mn, Pb, and Cr contents of sewage sludge were 1.705, 0.98, 0.022, 0.092, 0.069, 0.043, 1.17, 0.025, 0.21, 0.028%, 186 and 29 μg/g, respectively. The total contents of Cd and Ni in sewage sludge were below detection limit. A pot experiment was laid out in a completely randomized design with five treatments of sewage sludge (0, 40, 80, 120 and 240 t/ha) with BRRI dhan 29 grown in boro season with three replications. Sewage sludge was added to each pot containing 8 kg soil, 14 days before transplantation. Basal doses of N (25 kg/ha), P (80 kg P2O5/ha) and K (80 kg K2O/ha) were applied. One hundred kg N/ha was applied to SS0 treatment to achieve the normal growth of rice. Fifty per cent of N was applied at the time of pot preparation and the rest 50% N was top dressed in two equal splits after 55 and 100 days of transplantation. Eight uniform rice seedlings of seven weeks old were transplanted (2 seedlings/hill) in each pot but after 15 days, only the best four were allowed to grow. Pots were irrigated properly with normal tap water and intercultural operations were done whenever necessary. At maturity dry weight of rice grain, weight of 1000 grains and the number of filled and non-filled grains were determined. Total N content of rice grain was determined by Micro-Kjeldhal’s method (Jackson 1973). The total contents of Ca, Mg, Fe, Zn, Cu, Mn, Pb, Cr, Cd and Ni were determined after wet digestion of rice grain by HNO3-HClO4 acid mixture (5 : 1) using atomic absorption spectrometer (Perkin Elmer 3110). The total P and K contents were determined colorimetrically and flame photomertically, repectively. The results were statistically analyzed.
Bangladesh J. Sci. Res. 26(1&2): 57-60, 2013 (December)
Journal