Wickramasinghe, K.N.Nalliah, P.Paramasivam, S.2015-06-192015-06-191984Tea Quarterly53(1-2)pp.23-28https://dl-tri.nsf.gov.lk/handle/1/869AgricultureNitrogen fertilizersNutrient uptakePlant growthShoot productionA comparative study of the efficiency of utilization of urea and ammonium sulphate by mature tea plants using N-15 labelled fertilizersArticle