African Journal of
Agricultural Research

  • Abbreviation: Afr. J. Agric. Res.
  • Language: English
  • ISSN: 1991-637X
  • DOI: 10.5897/AJAR
  • Start Year: 2006
  • Published Articles: 6574

Full Length Research Paper

Influence of nitrogen fertilization on yield and yield components of rain-fed lowland NERICA® rice in the northern Guinea savanna of Nigeria

  A. Y. Kamara1,2*, F. Ekeleme3, L. O. Omoigui4 and D. Chikoye1    
    1International Institute of Tropical Agriculture Ibadan, Nigeria.  2c/o IITA Ltd, Carolyn House, 26 Dingwall Road, Croydon, CR 9 3EE, UK. 3College of Crop and Soil Sciences, Michael Okpara University of Agriculture, Umudike, P. M. B. 7267, Umuahia, Abia State, Nigeria. 4Department of Plant Breeding and Seed Science, College of Agronomy, University of Agriculture, Makurdi, Nigeria.
Email: [email protected]

  •  Accepted: 17 June 2011
  •  Published: 04 July 2011



This study evaluated the response of four rain-fed lowland New Rice for Africa (NERICA) varieties (NERICA-L-12, NERICA-L-41, NERICA-L-42 and NERICA-L-56) and a popularly grown Oryza sativa (ITA 150) to nitrogen (0, 30, and 100 kg N ha-1). The interactions between nitrogen and variety were not significant for all measured traits. Grain yields of the NERICAs were higher than the yield of ITA 150 (check) by 0.5 to 1.0 mg ha-1. When pooled across N rates and years, yield differences among the NERICAs were not significant. Grain yield response to nitrogen was linear. At 100 kg N ha-1, grain yield was significantly increased by 3.0 and 1.5 mg ha-1 over the yields at 0 and 30 kg N ha-1 respectively. Since grain yield response to N application was linear, further studies are recommended to determine the optimum rate of N for rain-fed lowland NERICA rice production.


Key words: NERICA rice, lowland rice, nitrogen fertilization.