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  2. Soil pH - Wikipedia

    en.wikipedia.org/wiki/Soil_pH

    Soil pH is considered a master variable in soils as it affects many chemical processes. ... 4.5–5.0 Strongly acidic: 5.1–5.5 ... A 20-g soil sample is mixed with ...

  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. Coir - Wikipedia

    en.wikipedia.org/wiki/Coir

    Mixed with sand, compost and fertilizer to make good quality potting soil. Coco peat generally has an acidity in the range of pH - 5.5 to 6.5, which is slightly too acidic for some plants, but many popular plants can tolerate this pH range. As substrate for growing mushrooms, which thrive on the cellulose.

  6. 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 ...

  7. Aspergillus parasiticus - Wikipedia

    en.wikipedia.org/wiki/Aspergillus_parasiticus

    For the best growth of the fungus the carbon and nitrogen content in the soil is 1:1 and the pH 5.5. [8] A. parasiticus normally reproduces asexually [ 2 ] however, the presence of single mating genes MAT1-1 or MAT1-2 in different strains of the fungus suggests it has a heterothallic mating system and may have a hitherto unrecognized teleomorph .

  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 - Wikipedia

    en.wikipedia.org/wiki/Soil

    If a soil has a CEC of 20 meq and 5 meq are aluminium and hydronium cations (acid-forming), the remainder of positions on the colloids (20 − 5 = 15 meq) are assumed occupied by base-forming cations, so that the base saturation is 15 ÷ 20 × 100% = 75% (the compliment 25% is assumed acid-forming cations).

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