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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. [4] Soil tests help indicate the pH, and red clay soil typically has a low pH. [5] The addition of lime is used to help to increase the pH in soil and can help increase the pH in Ultisol as ...

3. 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 ...

4. Clay - Wikipedia

   en.wikipedia.org/wiki/Clay

   A Quaternary clay deposit in Estonia, laid down about 400,000 years ago. Clay is a type of fine-grained natural soil material containing clay minerals [ 1 ] (hydrous aluminium phyllosilicates, e.g. kaolinite, Al 2 Si 2 O 5 (OH) 4). Most pure clay minerals are white or light-coloured, but natural clays show a variety of colours from impurities ...

5. List of Lustron houses - Wikipedia

   en.wikipedia.org/wiki/List_of_Lustron_houses

   Lustron House - 433 Dunreath Drive NE Cedar Rapids, IA 52402 currently for sale; Lustron House - 708 11th Ave, Coralville, Iowa; Lustron House - 3706 53rd St, Des Moines, Iowa; Lustron House - 4343 Chamberlain, Des Moines, Iowa; Lustron House - 927 N 3rd St, Fort Dodge, Iowa; Lustron House - 1460 South Grandview Ave, Dubuque, Iowa

6. 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]

7. In situ chemical oxidation - Wikipedia

   en.wikipedia.org/wiki/In_situ_chemical_oxidation

   Deep soil mixing requires specialized auger mixing equipment. In order to apply this method in-situ and in deep soil, the oxidant must be pumped to the point of mixing using a kelly bar (a piece of earth drilling equipment), or appropriate piping to the place where the soil needs to be oxidized. The soil then has to be mixed by using mixing blades.