Concept:Post-planting operations are farm activities carried out after seeds or crops have been planted.
Explanation:These operations help to maintain good growing conditions for crops.
Examples include thinning, supplying, mulching, weeding, and harvesting.
Thinning removes excess seedlings to reduce overcrowding after germination.
Supplying replaces seeds or seedlings that failed to germinate.
Mulching covers the soil surface to conserve moisture and control weeds.
Ridging, however, is a land preparation operation.
It is normally carried out before planting to make ridges or beds for crops.
Therefore, ridging is not a post-planting operation.
Answer:D. Ridging