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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. Macroptilium lathyroides - Wikipedia

    en.wikipedia.org/wiki/Macroptilium_lathyroides

    M. lathyroides is native to much of tropical and subtropical America, from Mexico to Argentina. It is adapted to a wide range of latitudes (up to 2000 m in Ecuador), soil types from deep sands to heavy clays, and with a pH range of (5.0–) 6.0–7.0 (–8.0). It is found in areas with annual rainfall range of 750–2,000 mm.

  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. ... Energy Star requires a rate of 0.5 in/ft (42 mm/m).

  7. Fall cone test - Wikipedia

    en.wikipedia.org/wiki/Fall_cone_test

    The British standard defines the liquid limit as the water content of a soil at which a 80g, 30º cone penetrates 20mm. Because it is difficult to obtain a test with exactly 20 mm penetration, the procedure is performed multiple times for a range of water contents and the results are interpolated .

  8. 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 ...

  9. Acid sulfate soil - Wikipedia

    en.wikipedia.org/wiki/Acid_sulfate_soil

    Sulfuric material refers to soil material that has a pH of less than 4 owing to the oxidation of sulfidic material. [ 27 ] Sulfidic material refers to “soil materials containing detectable inorganic sulfides (≥0.01% sulfidic sulfur) that can exist as horizons or layers at least 30 mm thick or as surficial features”, [ 27 ] and is further ...

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