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2. Soil pH - Wikipedia

   en.wikipedia.org/wiki/Soil_pH

   The optimum pH range for most plants is between 5.5 and 7.5; [3] however, many plants have adapted to thrive at pH values outside this range. Classification of soil pH ranges [ edit ]

3. pH - Wikipedia

   en.wikipedia.org/wiki/PH

   The pH range is commonly given as zero to 14, but a pH value can be less than 0 for very concentrated strong acids or greater than 14 for very concentrated strong bases. [2] The pH scale is traceable to a set of standard solutions whose pH is established by international agreement. [3]

4. Plant nutrition - Wikipedia

   en.wikipedia.org/wiki/Plant_nutrition

   Plant nutrition is the study of the chemical elements and compounds necessary for plant growth and reproduction, plant metabolism and their external supply. In its absence the plant is unable to complete a normal life cycle, or that the element is part of some essential plant constituent or metabolite .

5. Plant nutrients in soil - Wikipedia

   en.wikipedia.org/wiki/Plant_nutrients_in_soil

   Nutrients in the soil are taken up by the plant through its roots, and in particular its root hairs.To be taken up by a plant, a nutrient element must be located near the root surface; however, the supply of nutrients in contact with the root is rapidly depleted within a distance of ca. 2 mm. [14] There are three basic mechanisms whereby nutrient ions dissolved in the soil solution are brought ...

6. Topsoil - Wikipedia

   en.wikipedia.org/wiki/Topsoil

   The preceding tables are for a multipurpose grade and certain levels can alter with regard to soil pH. Standards also exist for specialist soils suitable for plants with specific needs including acidic or ericaceous soil and calcareous soil. These have different pH levels to typical soil and are meant for growing different plant species.

7. Soil test - Wikipedia

   en.wikipedia.org/wiki/Soil_test

   In agriculture, a soil test commonly refers to the analysis of a soil sample to determine nutrient content, composition, and other characteristics such as the acidity or pH level. A soil test can determine fertility , or the expected growth potential of the soil which indicates nutrient deficiencies, potential toxicities from excessive ...