What determines the depth of penetration of plant roots into the soil?

Any living creature on our planet has developed many adaptations for survival, and each organism tries to create for itself the most comfortable conditions for its life. Plants are no exception. The root system of trees and grasses has adapted to the requirements of the plant and the nature of the soil cover where it grows. The depth of root germination depends on the amount of water in the soil, on the finding of useful minerals in different layers of the earth, on the structure of the soil (black soil, stony, etc.).