M. K. Kabir
Department of Soil, Water and Environment, University of Dhaka, Dhaka- 1000, Bangladesh
A. T. M. M. Kamal
Department of Soil, Water and Environment, University of Dhaka, Dhaka- 1000, Bangladesh
S. Jahan
Department of Soil, Water and Environment, University of Dhaka, Dhaka- 1000, Bangladesh
A. M. M. Faizullah
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, Nitrogen fertilization, Rice grain yield, Mineral contents
Dhaka WASA sewage treatment plant, Pagla, Bangladesh
Crop-Soil-Water Management
Rice, Soil fertility
The experimental soil belonging to Naraibag series was collected from a depth of 0 - 15 cm. Dried sewage sludge (SS) was collected from Dhaka WASA sewage treatment plant, Pagla, Bangladesh. The collected soil and sewage sludge samples were air dried, ground and sieved through a 2 mm sieve for physical analyses as well as to grow rice. However, for chemical and physicochemical analyses, the soil and sewage sludge samples were further sieved through a 1 mm sieve and kept in plastic container. The relevant properties of the soil and sewage sludge samples are presented (Kabir a al. 2008). Rice seedlings (BRRI dhan-36) were grown in Boro season in pots containing 6 kg soil per pot. The experiment was conducted with five treatments, viz., SSoN280, SS60N49,SS120N35, SS200N28, and SS300N21 consisting of 5 levels of SS (0, 60, 120, 200 and 300 Ulla) and 5 levels of nitrogen (280, 49, 35, 28 and 21 kg/ha) in a CRD with three replications. Five treatments together with a basal dose of TSP (200 kg P205/ha) and muriate of potassium (200 kg K20/ha) were applied at the time of transplantation of rice seedling. After 5 days of transplantation, 50% N in the treatment SSoN280 and full dose of N in the rest of the treatments were applied. The remaining 50% N was applied in halves after 55 and 100 days of transplantation in SSoNiso treatment. Eight uniform-size rice seedlings of 40 days old were transplanted (2 seedlings/hill) in each pot, but after 15 days only the best four were allowed to grow. During the growing period, pots were irrigated properly with normal tap water and intercultural operations were done whenever necessary. The dry weight of grain, the weight of 1000 grains and the number of filled and non-filled grains were determined at maturity. The total nitrogen content of rice grain was determined by Micro-Kjeldhal's method (Jackson 1973). The protein content of rice grain was calculated by multiplying the %N content by a factor of 6.25. The total contents of P, K, Ca, Mg, Fe, Zn, Cu, Mn, Pb, Cr, Cd and Ni were determined after wet digestion of rice grain in HNO3-HC1O4 acid mixture (5 : 1). The total phosphorus content was determined colorimetrically using a Chemito visible spectrophotometer, after developing the yellow color with vanadomolybdate (Jackson 1973). Total potassium content in the extract was analyzed using a Gallenkamp flame photometer. The total contents of Ca, Mg, Fe, Zn, Cu, Mn, Pb, Cd, Cr and Ni in rice grain were analyzed in the extract by using Atomic Absorption Spectrometer (Perkin Elmer 3110) (Jackson 1973). The results were statistically analyzed using DMRT (Gomez and Gomez 1976).
Bangladesh J. Sci. Res. 24(2): 161-168, 2011 (December)
Journal