Conventional tillage is when farmers prepare the soil in their fields for planting crops by digging it up and turning it over with a plow. This makes the soil loose and allows air and water to get in, which can help the plants grow better.
Imagine playing with a sandbox. When you first open the box, the sand is all compacted and doesn't move around very easily. But if you take a shovel and start digging and turning the sand over, it becomes more loose and easier to play with. That's kind of like what farmers are doing when they perform conventional tillage.
Sometimes farmers might also add fertilizer or other chemicals to the soil while they're tilling to make sure the plants have enough nutrients to grow strong and healthy.
Overall, conventional tillage is a way for farmers to prepare their fields for growing crops and help their plants grow strong and healthy.