Effect of fertilizer, manure and irrigation on nutrient availability in soil of boro rice field

Abstract

The experiment was conducted in the farm of Sher-e-Bangla Agricultural University, Dhaka,Bangladesh to study the effect of various organic manures and inorganic fertilizers withdifferent water management on the nutrient availability of boro rice field. BRRI dhan29 wasused as the test crop in this experiment. The experiment consists of 2 factors i.e. Irrigationand fertilizer plus manure. Two levels of irrigations (I1= Continuous flooding and I2=Saturated Condition) were used with 8 levels of fertilizer plus manure, as T0: Control, T1:100% ( N120P25K60S20Zn2) Recommended dose of Fertilizer, T2: 50% NPKSZn + 5 ton cowdung ha-1, T3: 70% NPKSZn + 3 ton cow-dung ha-1, T4: 50% NPKSZn + 5 ton compost ha-1, T5:70% NPKSZn+3 ton compost ha-1, T6: 50% NPKSZn + 3.5 ton poultry manure ha-1 and T7:70% NPKSZn+2.1 ton poultry manure ha-1, with 16 treatment combinations and 3replications. The pore-water samples were collected and analyzed during rice growingperiod. The higher concentrations of N, P and K were found in the pore water of T6 (50%NPKSZn + 3.5 ton poultry manure ha-1) and T7 (70% NPKSZn + 2.1 ton poultry manure ha-1)treatments where higher yield were obtained. The higher N, P, K & S concentrations anduptake were observed in the treatments where fertilizer plus manure were applied. Thehighest concentrations of grain N (1.31%), P (0.272%), K (0.195%) and S (0.091%) wererecorded from T5, T3, T7 and T2 treatment respectively and lowest from T0 (Control)treatment.