The present study was conducted at the Dr. N.E. Borlaug s Crop Research Centre, G.B. Pant University of Agriculture and Technology, Pantnagar, Uttarakhand, India with an objective to evaluate the effects of different N doses on growth dynamic, morphological, physiological parameters and nitrogen use efficiency in five genotypes of rice. The field experiment was conducted during rainy season of 2008 and 2009. Five rice genotypes (KRH-2- hybrid, Vasumati- aromatic, Tulsi, Kasturi and Krishna Hamsa- high yielding) were used as experimental material. The N fertilizer 0, 50, 100 and 200N kg ha-1...