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2. Ultisol - Wikipedia

   en.wikipedia.org/wiki/Ultisol

   The use of soil tests, coupled with the corresponding provisions, can alleviate issues of nutrition and irrigation that can result from non porous Ultisol. Soil tests help indicate the pH, and red clay soil typically has a low pH. The addition of lime is used to help to increase the pH in soil and can help increase the pH in Ultisol as well ...

3. Claypan - Wikipedia

   en.wikipedia.org/wiki/Claypan

   Claypan is a dense, compact, slowly permeable layer in the subsoil. [1] It has a much higher clay content than the overlying material, from which it is separated by a sharply defined boundary. The dense structure restricts root growth and water infiltration. Therefore, a perched water table might form on top of the claypan. [2]

4. Building material - Wikipedia

   en.wikipedia.org/wiki/Building_material

   Building material is material used for construction. Many naturally occurring substances, such as clay, rocks, sand, wood, and even twigs and leaves, have been used to construct buildings and other structures, like bridges. Apart from naturally occurring materials, many man-made products are in use, some more and some less synthetic.

5. List of U.S. state soils - Wikipedia

   en.wikipedia.org/wiki/List_of_U.S._state_soils

   A state soil is a soil that has special significance to a particular state. Each state in the United States has selected a state soil, twenty of which have been legislatively established. These official state soils share the same level of distinction as official state flowers and birds. Also, representative soils have been selected for Puerto ...

6. Loam - Wikipedia

   en.wikipedia.org/wiki/Loam

   Soil types by clay, silt and sand composition as used by the United States Department of Agriculture. Loam (in geology and soil science) is soil composed mostly of sand (particle size > 63 micrometres (0.0025 in)), silt (particle size > 2 micrometres (7.9 × 10 −5 in)), and a smaller amount of clay (particle size < 2 micrometres (7.9 × 10 −5 in)).

7. Earthbag construction - Wikipedia

   en.wikipedia.org/wiki/Earthbag_construction

   It is a natural building technique developed from historic military bunker construction techniques and temporary flood-control dike building methods. The technique requires very basic construction materials: sturdy sacks filled with organic material usually available on site. Standard earthbag fill material has internal stability.