Ahmed, Niaz, Muhammad Abid, Muhammad Farooq Qayyum, Muhammad Arif Ali, Shahid Hussain, and Sibgha Noreen. 2016. “Nutrient Dynamics in Cotton Leaf Tissues As Affected by Zinc Fertilization and Ontogeny: Nutrient Dynamics in Cotton Leaf Tissues”. Proceedings of the Pakistan Academy of Sciences: B. Life and Environmental Sciences 53 (4):283-92. http://ppaspk.org/index.php/PPAS-B/article/view/272.