Concept:
Tillage is the mechanical manipulation of soil for seedbed preparation and crop production.
Step 1: In conventional tillage, soil is ploughed and prepared before sowing.
Step 2: In zero tillage, the crop is planted directly into the untilled soil.
Step 3: The seedbed is not disturbed after harvesting of the previous crop.
Step 4: This method saves time, labour, fuel and helps reduce soil erosion.
Step 5: Therefore, the given tillage system is zero tillage.
\[
\boxed{\text{Zero tillage}}
\]