'Ground' in the Bible

Are not two sparrows sold for a penny? and not one of them shall fall on the ground without your Father:

and others fell upon the good ground, and yielded fruit, some a hundredfold, some sixty, some thirty.

And he that was sown upon the good ground, this is he that heareth the word, and understandeth it; who verily beareth fruit, and bringeth forth, some a hundredfold, some sixty, some thirty.

And he commanded the multitude to sit down on the ground;