SURVEY ON WEED PROBLEM IN WHEAT CROP IN DISTRICT CHITRAL (A HIGHER ALTITUDE AREA) OF NWFP PAKISTAN* Zahid Hussain Khan Bahadar Marwat Marwat Muhammad Saeed Bakhtiar Gul Muhammad Riaz Khalil Khalil DOI: https://doi.org/10.28941/pjwsr.v13i1%20and%202.231 PDF Published 2007-03-01 Issue Year 2007, Volume 13 , Issue 1 and 2 Section Articles