M.A. Khan
Department of Soil Science, Sher-e-Bangla Agricultural University, Dhaka-1207, Bangladesh.
M.A. Khan
Department of Soil Science, Sher-e-Bangla Agricultural University, Dhaka-1207, Bangladesh.
S.A. Shampa
Department of Soil Science, Sher-e-Bangla Agricultural University, Dhaka-1207, Bangladesh.
P.K. Biswas
Department of Agronomy, Sher-e-Bangla Agricultural University, Dhaka-1207, Bangladesh.
M.B. Hossain
Bangladesh Agricultural Research Council, Farmgate, Dhaka-1207, Bangladesh.
S.A. Shampa
Department of Soil Science, Sher-e-Bangla Agricultural University, Dhaka-1207, Bangladesh.
P.K. Biswas
Department of Agronomy, Sher-e-Bangla Agricultural University, Dhaka-1207, Bangladesh.
M.B. Hossain
Bangladesh Agricultural Research Council, Farmgate, Dhaka-1207, Bangladesh.
Irrigation, Fertilizer, Manure, Rice, Soil fertility
Sher-e-Bangla Agricultural University (SAU), Dhaka
Crop-Soil-Water Management
Fertilizer and manures, Rice, Fertilizer and manures, Rice, Rice, Fertilizer and manures, Irrigation scheduling
The experiment was conducted in the field of the experimental farm at Sher-e-Bangla Agricultural University (SAU), Dhaka from January 2012 to December 2014. The area belongs to the Tejgaon soil series of Madhupur Tract (AEZ 28) having 28°74¢N latitude and 90°35¢ E longitude with an elevation of 8.2 meters from sea level. The soil of the experimental field is classified as Deep Red Brown Terrace Soils in the Bangladesh soil classification system (UNDP and FAO, 1988). The soil is a silt loam with 6.4 pH, 1.12% organic matter (Walkley and Black, 1975), 0.08% total N (Micro Kjeldahl method; Bremner and Mulvaney, 1982), 12.0 μg g-1 available P (0.5M NaHCO3 extractable; Olsen and Sommers, 1982) and 22.5 μg g-1 exchangeable K (1MNH4OAc extractable; Page et al., 1982). The experiment was laid out in a split-plot design assigning irrigations to the main plots and fertilizer treatments to the sub-plots with three replications. Three Irrigation treatments (I1= Continuous flooding (3-4 cm water), I2= saturated condition (disappearance of water on the surface) and I3: Alternate wetting and drying) and eight fertilizer treatments T0: Control, T1: 100% Recommended dose of chemical fertilizer (RDCF), T2: 50% RDCF + 5 t ha-1 cowdung, T3: 70% RDCF + 3 t ha-1 cowdung, T4: 50% RDCF + 5 t ha-1compost, T5: 70% RDCF + 3 t ha-1 compost, T6: 50% RDCF + 3.5 t ha-1 poultry manure, T7: 70% RDCF + 2.1 t ha-1 poultry manure were applied in the experiment during Boro rice cultivation. The land was leveled and the experimental plot was partitioned into the unit plots. Treatment wise cowdung, compost, and poultry manures were applied before four days of final land preparation. There were 1.46% N, 0.29% P, 0.74% K in cowdung; 2.2% N, 1.99% P, 0.82% K in poultry manure and 1.49% N, 0.28% P, 1.60% in water hyacinth compost. TSP, MoP, gypsum, zinc sulphate, and one-third of urea were applied during the final land preparation. The remaining one-third urea was applied at 30 DAT and another one-third at 55 DAT. The fertilizer and manures were mixed in the soils of the plots. The first crop is boro rice var. BRRI dhan29 was transplanted during the first week of January 2012 and the second crop T. Aman rice (var. BRRI dhan32) was transplanted in July 2012. The 35-day old seedlings for Boro rice (dry season rice) and T. Aman (Wet season rice) were transplanted with a spacing of 20 cm × 20 cm. Intercultural operations were done whenever required. After harvesting of Boro rice, T. Aman rice was transplanted and grown in rainfed condition without any manure application in soil but recommended dose (N100P15K45S12Zn2) was applied. Supplemented irrigation was applied as per irrigation treatments during T. Aman growing period. The yield and yield parameters were recorded for each crop. Similarly, third crop Boro rice (2013), fourth crop T. Aman rice (2013), and fifth crop Boro rice (2014) were grown in the same plots with the application of similar fertilizer and irrigation treatments. After harvest of the fifth crop, treatment-wise post- experimental soils were collected from 0-15cm depth and analyzed for N, P, K, pH, and soil organic matter content by using standard methods. Soil pH was measured by a glass electrode pH meter using a soil-water ratio of 1:2.5 (McLean, 1982). Organic matter content was estimated by the wet oxidation method (Walkley and Black, 1975). The total N contents in soil were determined by the micro-Kjeldahl method (Bramner and Mulvaney, 1982). The soil P (Olsen and Sommers, 1982) and K (Page et al.,1982) were determined by using a spectrophotometer and flame photometer, respectively.
Statistical analysis
The data obtained for different parameters were statistically analyzed and significance of the difference among the treatment means was estimated by the Duncan’s Multiple Range Test (DMRT) at 5% level of probability.
Bangladesh Agron. J. 2021, 24(1): 71-81
Journal