Senanayake, N.Ananda, w.W.S.R.M.R.Pathirana, R.P.S.P.2010-07-062010-07-061986Journal of the National Science Council of Sri Lanka, 14(2):p.181-188https://dl.nsf.gov.lk/handle/1/6551WeedsGrain yieldAgricultureThreshold density of Echinocloa crusgalli (L) beauv. in rice weed competitionArticle