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2. Soil organic matter - Wikipedia

   en.wikipedia.org/wiki/Soil_organic_matter

   Soil organic matter

3. Physical properties of soil - Wikipedia

   en.wikipedia.org/wiki/Physical_properties_of_soil

   When the organic component of a soil is substantial, the soil is called organic soil rather than mineral soil. A soil is called organic if: Mineral fraction is 0% clay and organic matter is 20% or more; Mineral fraction is 0% to 50% clay and organic matter is between 20% and 30%; Mineral fraction is 50% or more clay and organic matter 30% or ...

4. Organic farming - Wikipedia

   en.wikipedia.org/wiki/Organic_farming

   Organic farming - Wikipedia ... Organic farming

5. Soil - Wikipedia

   en.wikipedia.org/wiki/Soil

   Soil - Wikipedia ... Soil

6. Soil formation - Wikipedia

   en.wikipedia.org/wiki/Soil_formation

   Soil formation - Wikipedia ... Soil formation

7. Soil color - Wikipedia

   en.wikipedia.org/wiki/Soil_color

   Soil colors influenced by mineralogy. Soil color is often the most visually apparent property of soil. While color itself does not influence the behavior or practical use of soils, [1] it does indicate important information about the soil organic matter content, mineralogy, moisture, and drainage.