For what purpose are some cultivated plants thinned out?

Each plant needs a certain amount of soil around it. This is especially necessary for plants that form a root crop – carrots, beets, radishes. Timely thinning of root crops (this is done when the plants have not yet formed a large root) allows the remaining plants to grow fully, to form a large root crop. After all, if you leave all the sprouted plants, then they will grow small, since the soil and nutrients will not be enough for everyone.