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2. 7 Plants That Improve Soil Quality, According to Gardening ...

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

   Get your grow on with these soil-enriching botanicals. Skip to main content. Sign in. Mail. 24/7 Help. For premium support please call: 800-290-4726 more ways to reach us. Mail. Sign in ...

3. Plant litter - Wikipedia

   en.wikipedia.org/wiki/Plant_litter

   Plant litter (also leaf litter, tree litter, soil litter, litterfall or duff) is dead plant material (such as leaves, bark, needles, twigs, and cladodes) that have fallen to the ground. This detritus or dead organic material and its constituent nutrients are added to the top layer of soil, commonly known as the litter layer or O horizon ("O ...

4. Physical properties of soil - Wikipedia

   en.wikipedia.org/wiki/Physical_properties_of_soil

   Soil texture is determined by the relative proportion of the three kinds of soil mineral particles, called soil separates: sand, silt, and clay. At the next larger scale, soil structures called peds or more commonly soil aggregates are created from the soil separates when iron oxides , carbonates , clay, silica and humus , coat particles and ...

5. 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)).

6. 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 .

7. Soil matrix - Wikipedia

   en.wikipedia.org/wiki/Soil_matrix

   Gravel, sand and silt are the larger soil particles, and their mineralogy is often inherited from the parent material of the soil, but may include products of weathering (such as concretions of calcium carbonate or iron oxide), or residues of plant and animal life (such as silica phytoliths).