Jahanbakhshi, A., ., Tajari, B, Razdareh, S. H., & Kheiralipour, K. (2016). Determination and comparison of drill seeder draft in different engine rotation speed, gear ratio and working depth. International Journal of Agricultural Technology, 12(5), 851–858. retrieved from https://li04.tci-thaijo.org/index.php/IJAT/article/view/6668