In Quest of Nitrogen Use-Efficient Rice Genotypes for Drought-Prone Rainfed Ecosystems

Nitrogen (N) use efficiency in rainfed agriculture is generally low because of poor management and unavailability suitable rice genotypes. There a need to select genotypes with high N for these specific environments, which was investigated at the Bangladesh Rice Research Institute, Regional Station, Rajshahi, two successive years. The performance six genotypes, IR7437170-1-1, BR7873-5 * (NIL)-51-HR6, IR 83377-B-B-93-3, International Institute (IRRI) 123, IR83381-B-B-6-1, Binadhan-7, were tested under four rates (0, 55, 83, 110 kg ha −1 ) strip-plot design. Grain yields increased up 83 declined thereafter. Depending on rates, mean grain by 35–45% compared control (N 0 ). However, IRRI Binadhan-7 . uptake its efficiencies highest par those 123. (BRRI) dhan56 showed intermediate performance, while BRRI dhan57 IR83381-B-B-6-1 lower efficiencies. Between 16.5 19.2 required produce 1 ton paddy. IR83381-B-B-93-3 123 most efficient irrespective but IR87781-B-B-6-1 observed be inefficient intermediate. Thus, this study indicates test existing new germplasm optimal their NUE, especially environments where optimized resource essential higher farmers' income.