Effects of Nitrogen Levels and its Splitting on Rice Yield and Nutrient Uptake in Rice, Hashemi Variety

In order to investigate the effects of nitrogen fertilizer amount and its spliting on rice (Hashemi variety) yield and nutrients uptake from urea source, was conducted in the National Rice Research Instituteduring during a two- year experiment. The study has been done based on a Randomized Complete Block Design (RCBD) with three replications. Increasing amount of nitrogen fertilizers based on urea source in four categories was as the first factor, i.e. 30, 60, 90, and 120 kg nitrogen ha-1 and the time of its application was as the second factor i.e. basal application at transplanting, two splits i.e. at transplanting and at the beginning of tillering, and three splits i.e. at transplanting, at the beginning of tillering and just before flowering. Results showed that yield and nitrogen uptake by grain and straw increased significantly by applying of increased amount of urea fertilizer and when the fertilizer was used in two or three splits application (P