ALkhafaji, Ayad J., Abdulaziz A. Almosawi, and Kamal M. Alqazzaz. “Performance of Combined Tillage Equipment and It’s Effect on Soil Properties.” International Journal of Environment, Agriculture and Biotechnology 3, no. 3 (2018): 799–805. https://doi.org/10.22161/ijeab/3.3.12.