- Deep ploughing turns out large-sized clods, which are baked by the hot sun when it is done in summer.
- These clods crumble due to alternate heating and cooling and due to occasional summer showers.
- This process of the gradual disintegration of clods improves soil structure and soil moisture content.
- The rhizomes and tubers of perennial weeds (world’s problematic weeds viz., Cynodon dactylon and Cyperus rotundus) die due to exposure to the hot sun.
- Summer deep ploughing kills pests due to exposure of pupae to the hot sun.
- 25-30 cm depth is necessary for a deep-rooted crop like pigeon pea while moderate depth of 15-20 cm is required for maize.
- Deep tillage is done for long-duration, deep-rooted crops.