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  2. Soil pH - Wikipedia

    en.wikipedia.org/wiki/Soil_pH

    The pH is measured in soil-water (1:1) and soil-salt (1:2 ) solutions. For convenience, the pH is initially measured in water and then measured in CaCl 2 {\displaystyle {\ce {CaCl2}}} . With the addition of an equal volume of 0.02 M CaCl 2 {\displaystyle {\ce {CaCl2}}} to the soil suspension that was prepared for the water pH, the final soil ...

  3. Soil acidification - Wikipedia

    en.wikipedia.org/wiki/Soil_acidification

    Soil acidification is the buildup of hydrogen cations, which reduces the soil pH. Chemically, this happens when a proton donor gets added to the soil. The donor can be an acid, such as nitric acid, sulfuric acid, or carbonic acid. It can also be a compound such as aluminium sulfate, which reacts in the soil to release protons.

  4. Soil guideline value - Wikipedia

    en.wikipedia.org/wiki/Soil_guideline_value

    Soil Guideline Values (SGVs) are figures which are used in non-statutory technical guidance for assessors carrying out risk assessments to determine whether land is considered "contaminated" under United Kingdom law, that is "land which appears to... be in such a condition, by reason of substances in, on or under the land, that (a) significant harm is being caused or there is a significant ...

  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. Fishing Creek (North Branch Susquehanna River tributary)

    en.wikipedia.org/wiki/Fishing_Creek_(North...

    The water quality of Fishing Creek can vary. Its pH ranges from 4.9 to 8.5, while the concentration of dissolved oxygen ranges from 5 to 17.5 mg per liter. The creek's average discharge is 615 cubic feet per second (17.4 m 3 /s); its watershed contains gravel, shale and various loams—in particular the Albrights soil series and the Leck Kill soil.

  7. Soil - Wikipedia

    en.wikipedia.org/wiki/Soil

    A pH of 9.5 has 10 −9.5 moles hydronium ions per litre of solution (and also 10 −2.5 moles per litre OH −). A pH of 3.5 has one million times more hydronium ions per litre than a solution with pH of 9.5 (9.5 − 3.5 = 6 or 10 6) and is more acidic. [115] The effect of pH on a soil is to remove from the soil or to make available certain ions.

  8. AASHTO Soil Classification System - Wikipedia

    en.wikipedia.org/wiki/AASHTO_Soil_Classification...

    AASHTO Soil Classification System (from AASHTO M 145 or ASTM D3282) General Classification Granular Materials (35% or less passing the 0.075 mm (No. 200) sieve) Silt-Clay Materials (>35% passing the 0.075 mm (No. 200) sieve) Group Classification A-1 A-3 A-2 A-4 A-5 A-6 A-7 A-1-a A-1-b A-2-4 A-2-5 A-2-6 A-2-7 A-7-5 A-7-6 Sieve Analysis, % passing

  9. Soil fertility - Wikipedia

    en.wikipedia.org/wiki/Soil_fertility

    [1] [2] Soil fertility refers to the ability of soil to sustain agricultural plant growth, i.e. to provide plant habitat and result in sustained and consistent yields of high quality. [3] It also refers to the soil's ability to supply plant/crop nutrients in the right quantities and qualities over a sustained period of time.

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