Effect of crop establishment method and N management practice on productivity of transplanted aman rice

Abstract

An experiment was conducted at the Bangladesh Rice Research Institute Regional Station, Rajshahi, Bangladesh to find the most suitable crop establishment method and best application of N management practice for transplanted aman rice. The monsoon-season rainfed rice is aman, which is planted in two ways: direct seeding in March or April and transplantation between July and August. Both types are harvested from November through December. T. aman rice variety, BRRI dhan44 was used as planting material where three crop establishment methods (T1: direct wet seeding by drum seeder, T2: hand broadcasting and T3: transplanting) and four N management practices (N1: ⅓ at 15 DAT+ ⅓ at 30 DAT +⅓ at panicle initiation (PI), N2: ¼ at basal + ¼ at 15 DAT + ¼ at 30 DAT + ¼ at PI, N3: leaf color chart (LCC) based N application, N4: no nitrogen) were tested. Among crop establishment methods, the transplanting method (T3) produced the highest plant density m-2 (143.16) and yield (5.05 t ha–1 ). Among N management practices, N2 gave the greatest yield (4.97 t ha–1 ) and the highest benefit cost ratio (1.97). Treatment combination of T3N2 at 60 DAT produced the highest plant density m-2 (152.33). Therefore, from the current study, it can be concluded that the transplanting method (T3) and N split fertilization of ¼ at basal + ¼ at 15 DAT + ¼ at 30 DAT + ¼ at PI (N2), singly or together, would be the most productive application treatments during aman season.