Effects of Prilled Urea and Urea Super Granule with Poultry Manure on Rice Field Water Property, Growth and Yield of BRRI Dhan 49 - Abstract
A field experiment was conducted at the Soil Science farm of Bangladesh Agricultural University, Mymensingh during the Aman season of 2011 for investigating the integrated effect of prilled urea (PU) and urea super granules (USG) with poultry manure (PM) on field water property, growth and yield of BRRI Dhan 49. There were seven treatments such asT1: Control, T2: 56 kg N ha-1 as USG; T3: 83.5 kg N ha-1 as PU; T4: 56 kg N ha-1 as USG+PM (3.0 t ha-1); T5: 83.5 kg N ha-1 as PU+PM (3.0 t ha-1); T6: 112.5 kg N ha-1 as USG; T7
: 165.0 kg N ha-1 as PU. Application of USG in combination with poultry manure produced NH4+-N slowly and steadily due to deep placement by keeping most of the urea nitrogen in the soil and out of the irrigation water. This resulted in continuous supply of available N throughout the growth period of rice plant, which ultimately gave the higher yield. Significant variations were found in all the yield contributing characters except thousand grain weight by different treatments over control. The highest grain yield (5389 kg ha-1) and straw yield (6921 kg ha-1) was produced from T4which is statistically similar to T5and T6. The maximum N uptake by grain (64.28 kg ha-1) and straw (40.91 kg ha-1) were obtained from USG in combination with poultry manure. It also showed the maximum values of apparent N recovery and N use efficiency possibly due to deep placement of USG and application of poultry manure in rice field. The overall results clearly indicate that application of USG in combination with poultry manure in rice field increases absorption efficiency and decreases N loss leading to water pollution reduction, efficient uptake and utilization of the applied N, and rice yield augmentation.