Abdullahi, Maryam, and Abubakar Bello. “Effects of Different Levels of Phosphorous and Zinc Fertilizers on the Yield and Nutrient Uptake of Maize (Zea Mays L.) on Luvisols in Northern Guinea Savannah Region of Nigeria”. Asian Journal of Soil Science and Plant Nutrition 6, no. 4 (August 10, 2020): 1-7. Accessed September 29, 2020. https://journalajsspn.com/index.php/AJSSPN/article/view/30093.