What is another word for subsoils?
Pronunciation: [sˈʌbsɔ͡ɪlz] (IPA) 
Subsoils are the layers of soil beneath the topsoil layer. They play an important role in determining the quality and health of soil for plants to grow. There are several synonyms for subsoils, such as substratum, substrata, subterranean soil, lower soil horizons, or subgrade. Substratum refers to the layer or substance that underlies something, whereas subterranean soil refers to soil that is underground. The term subgrade relates to the natural or prepared level beneath the surface of the soil. All these synonyms point towards the importance of the underlying layers of soil for sustaining plant life and the proper growth of crops.
