Bagyaraj, D.J.Suvarna, C.V.2012-12-062012-12-061999Agrieast1pp.16-21https://dl.nsf.gov.lk/handle/1/9507AgricultureBiofertilizersMicroorganismsPlant nutrientsSoil bacteriaInoculationNitrogen fixationBiofertilizers and their applicationArticle