Aday, Shaker H., and Yarub Al-muthafar. 2019. “Comparison Study Between the Field Performance of a Movable Boards and Conventional Ditch Openers in Cultivated and Uncultivated Soils, Part 3: The Specific Resistance”. Basrah Journal of Agricultural Sciences 32 (1):15-24. https://doi.org/10.37077/25200860.2019.113.