Influence of organic and inorganic nitrogen on the growth and yield of irrigated rice

The objective of this research was to evaluate the impact of organic and inorganic sources of nitrogen (N) on growth dynamics, yield, N content, N uptake and agronomic efficiency (AE) of irrigated rice. Four  high-yielding boro (dry season irrigated) rice cultivars viz. BRRI dhan29, BRRI dhan59 Binadhan-8 and Binadhan-10 along with six N management combinations viz. Control (no N application), 140 kg N ha^-1 from Prilled Urea (PU), 83 kg N ha^-1 from Urea Super Granule (USG), 105 kg N ha^-1 from PU + 3 t ha^-1 Poultry manure, 112 kg N ha^-1 from PU + 5 t ha^-1 Cowdung and  77 kg N ha^-1 from PU + 4 t ha^-1 vermi compost were used in the study. The cultivar Binadhan-8 had a higher yield than all other cultivars because of the highest total dry matter (TDM), number of effective tillers hill^-1, and number of grains panicle^-1.Growth, TDM, yield, and AE were highest with 105 kg N ha^-1 from PU + 3 t ha^-1 Poultry manure application .The highest N uptake in grain and straw (120.1 kg ha^-1 and 96.14 kg ha^-1, respectively) was shown by rice cultivar Binadhan-8. In addition, significant relationships between N concentration and growth dynamics, TDM, N content, N uptake, and yield were observed. These results indicated that cultivars with the capacity to uptake more N can produce more yield and N application along with poultry manure could enhance growth, yield, AE. Therefore, the combined application of N sources in the form of PU + Poultry manure can produce good performances in terms of growth and yield of HYV rice under irrigated condition.