Thanaraj, T.Sandanam, S.2012-12-062012-12-061999Agrieast1pp.59-66https://dl.nsf.gov.lk/handle/1/9487AgricultureLegumesNitrogen fertilizersNodulationEffect of different levels and frequency of nitrogen application on the nodulation of groundnut(Arachis hypogea L) in regosolsArticle