EFFECT OF WEED COMPETITION AT DIFFERENT GROWTH STAGES ON THE YIELD OF POTATO ( SOLANUM TUBERSUM L. ) Z.A.CHEEMA A.TANVEER S.AHMAD M.F NADEEM DOI: https://doi.org/10.28941/pjwsr.v7i1%20and%202.72 PDF Published 1994-03-01 Issue Year 1994, Volume 7 , Issue 1 and 2 Section Articles