Effect of urea briquettes deep placement on yield and nitrogen use efficiency of rice

Abstract

Effect of urea briquette deep placement with applicator on yield and yield attributing parameters of rice studied and experiment was conducted at “Research cum Instructional farm”, “Indira Gandhi Krishi Vishwavidhyalaya”, Raipur (C.G.) during kharif-2019 in randomized block deign with ten treatments and three replication with rice variety “IGKV-R1” used as test crop.The treatment consists of different level of nitrogen combine with different mode of urea application, i.e. T1 (control), T2 (N0), T3 (100 kg N ha-1), T4 (75 kg N ha-1), T5 (120 kg N ha-1), T6 (150 kg N ha-1), T7 (75 kg N ha-1 applied as urea briquette deep placement manually), T8 (75 kg N ha-1 applied as urea briquette deep placement using applicator), T9 (150 kg N ha-1 applied as urea briquette deep placement manually) and T10 (150 kg N ha-1 applied as urea briquette deep placement using applicator) and uniform dose of P2O5 and K2O @ 60 kg P2O5 ha-1 and 40 kg K2O ha-1, respectively applied uniformly in each treatment except T1 (Control). The plant height, total and effective tillers/hill, number of filled grains/panicle were found significantly higher in treatment under Urea Briquette @ 150 kg N ha-1 applied through UB applicator (T10). The yield of rice (i.e. straw and grain yield) was also significantly influenced by different mode of urea application and treatment under urea briquette application @ 150 kg N ha-1 (T10) found significantly higher than other. Total nitrogen uptake by the rice plant was also significantly higher in treatment under 150 kgNha-1 urea briquette placed either manually or by applicator (T9 and T10) than others. The highest NUE was recorded with application of 75 kg N ha-1 urea briquette through UB applicator (T8).