A scarifier is a tool or machine used to cut into the ground or surface to remove weeds or prepare for planting.
A scarifier is a helpful tool for gardening and farming.
Examples:
The farmer used a scarifier to prepare the soil for planting.
I need to buy a scarifier for my garden.
The scarifier helps the farmer get rid of the bad plants.
The scarifier is like a big comb for the ground.
With a scarifier, you can make the ground very clean.
The scarifier is loud but it helps the plants grow better.