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  2. Soil pH - Wikipedia

    en.wikipedia.org/wiki/Soil_pH

    Acid soils have a pH below 7 and alkaline soils have a pH above 7. Ultra-acidic soils (pH < 3.5) and very strongly alkaline soils (pH > 9) are rare. [2] [3] Soil pH is considered a master variable in soils as it affects many chemical processes.

  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. pH - Wikipedia

    en.wikipedia.org/wiki/PH

    At 25 °C (77 °F), solutions with a pH less than 7 are acidic, and solutions with a pH greater than 7 are basic. Solutions with a pH of 7 at 25 °C are neutral (i.e. have the same concentration of H + ions as OH − ions, i.e. the same as pure water). The neutral value of the pH depends on the temperature and is lower than 7 if the temperature ...

  5. The 2 Best Ways to Test Your Soil pH, According to a ... - AOL

    www.aol.com/lifestyle/2-best-ways-test-soil...

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  6. Cation-exchange capacity - Wikipedia

    en.wikipedia.org/wiki/Cation-exchange_capacity

    Effect of soil pH on cation-exchange capacity. The amount of negative charge from deprotonation of clay hydroxy groups or organic matter depends on the pH of the surrounding solution. Increasing the pH (i.e. decreasing the concentration of H + cations) increases this variable charge, and therefore also increases the cation-exchange capacity.

  7. Plant nutrients in soil - Wikipedia

    en.wikipedia.org/wiki/Plant_nutrients_in_soil

    Phosphorus is most available when soil pH is 6.5 in mineral soils and 5.5 in organic soils. ... It is thus low in sandy and heavily leached soil or strongly acidic ...