Babar, Muhammad Ayub, Ajmal Khan, Sher Azam, Ikramullah ., Muhammad Arif, & Sarfaraz Hussain. " 71. Weeds in wheat crop: weed whole plants nutrient concentration and uptake under fertilizer application and irrigation frequencies." Pure and Applied Biology (PAB) [Online], 8.2 (0): 1724-1735. Web. 14 Nov. 2019