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2. Ultisol - Wikipedia

   en.wikipedia.org/wiki/Ultisol

   Clay soil is known to retain nutrients very well because its negative charge helps to attract cations. As a result, Ultisol does not often require the high amounts of fertilizer additions other types of soils often do. However, this retention of nutrients coincides with a lack of water filtration that may subject plants to highly saturated soil.

3. Clay - Wikipedia

   en.wikipedia.org/wiki/Clay

   Clay is a type of fine-grained natural soil material containing clay minerals (hydrous aluminium phyllosilicates, e.g. kaolinite, Al 2 Si 2 O 5 4). Most pure clay minerals are white or light-coloured, but natural clays show a variety of colours from impurities, such as a reddish or brownish colour from small amounts of iron oxide .

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

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

   This is a 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.

5. The 2 Best Ways to Test Your Soil pH, According to a ... - AOL

   www.aol.com/2-best-ways-test-soil-113000549.html

   The pH, or acidity, of the soil affects how well those nutrients can be absorbed from the soil.” This is important because plants need those minerals to make flowers, fruits, and roots, and some ...

6. 7 Plants That Improve Soil Quality, According to Gardening ...

   www.aol.com/7-plants-improve-soil-quality...

   Milk Thistle. Milk thistle has soil-building qualities that can help your garden grow and stay healthy, according to Bendall. “The plant is very potassium-rich and its strong and deeply ...

7. Expanded clay aggregate - Wikipedia

   en.wikipedia.org/wiki/Expanded_clay_aggregate

   Lightweight expanded clay aggregate ( LECA) or expanded clay ( exclay) is a lightweight aggregate made by heating clay to around 1,200 °C (2,190 °F) in a rotary kiln. The heating process causes gases trapped in the clay to expand, forming thousands of small bubbles and giving the material a porous structure. LECA has an approximately round or ...