Effect of integrated nitrogen application on the yield of two Boro rice varieties: BRRI dhan29 and BRRI dhan74

Abstract

This study aimed to evaluate the effect of integrated nitrogen (N) application on the yield of Boro rice. The experiment was composed of two rice varieties: BRRI dhan29 and BRRI dhan74, and eleven N management approaches: control (without N), 100% varietal recommended dose (RD) of N from urea, 75% of RD from urea + 25% of RD from poultry manure (PM), 50% of RD from urea + 50% of RD from PM, 25% of RD from urea + 75% of RD from PM, 75% of RD from urea + 25% of RD from vermicompost (VC), 50% of RD from urea + 50% of RD from VC, 25% of RD from urea + 75% of RD from VC, 75% of RD from urea + 25% of RD from cowdung (CD), 50% of RD from urea + 50% of RD from CD and 25% of RD from urea + 75% of RD from CD. Performance of BRRI dhan74 was better compared to BRRI dhan29 in terms of yield. For both verities, application of 75% of RD from urea + 25% of RD from PM produced the highest grain yield (BRRI dhan74: 3.30 t ha^-1 and BRRI dhan29: 3.08 t ha^-1) and the lowest with control among the N management approaches. Thus, it can be suggested that integrated N application with 75% of varietal RD from urea and 25% from PM in Boro rice cultivation will produce appreciable grain yield and also expected to have positive effect on soil health.