Mohammed, Deia A., and Khaled M . Mugbel. “INFLUENCE OF DIFFERENT PLOWING METHODS AND IRRIGATION PERIODS ON SOME SOIL PHYSICAL PROPERTIES UNDER CROP GROWING OF CORN PLANT ”. Diyala Agricultural Sciences Journal , vol. 3, no. 2, Dec. 2011, pp. 276-91, https://journal.djas.uodiyala.edu.iq/index.php/dasj/article/view/3025.