The Influence of Plow Types, Tillage Depth and Amendment Addition on the Mean Weight Diameter (MWD) of Clay Soil

Abstract The experiment was carried out in spring 2021 at the Agricultural Research Station of the Faculty of Agriculture, University of Basrah, in clay soil. The experiment included three factors: the plow type (chisel, moldboard, and disc plow), the tillage depth (15 and 30 cm) and the addition of amendments (cow dung and anionic polyacrylamide). All three factors were examined to determine their influence on mean weight diameter (MWD). The study used a split-split block randomized complete block design. The results indicated that the chisel plow outperformed the moldboard plow and disc plow in achieving the highest mean weight diameter. Furthermore, the results showed that a tillage depth of 30 cm was better than a depth of 15 cm for increasing MWD. Moreover, all amendments addition improved soil properties and increased (MWD), and the mixed treatment (T5) recorded the highest value of mean weight diameter..