Shi, Yinyan, Zhichao Hu, Xiaochan Wang, Morice O. Odhiambo, and Guoxiang Sun. 2018. “Fertilization Strategy and Application Model Using a Centrifugal Variable-Rate Fertilizer Spreader”. International Journal of Agricultural and Biological Engineering 11 (6):41-48. https://ijabe.migration.pkpps03.publicknowledgeproject.org/index.php/ijabe/article/view/3789.