The purpose of this research was to determine the effect of N fertilizer at second cutting stage on fiber fraction content Hymenachne amplexicaulis, Ischaemum rugosom dan Oryza rufipogon. This research was held on January to March 2008 in greenhouse Department of Agronomy, and Animal feed and Nutrition Laboratory, Agriculture Faculty, Sriwijaya University. The research was continuing ofthe prev…