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  2. Soil pH - Wikipedia

    en.wikipedia.org/wiki/Soil_pH

    Soil pH is a key characteristic that can be used to make informative analysis both qualitative and quantitatively regarding soil characteristics. [ 1 ] pH is defined as the negative logarithm (base 10) of the activity of hydronium ions ( H +

  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. Acid sulfate soil - Wikipedia

    en.wikipedia.org/wiki/Acid_sulfate_soil

    the action criteria triggering the need for an Acid Sulfate Soil Management Plan (ASSMP); a description of the key pools of actual and potential acidity; an overview of the hazards associated with the disturbance of acid sulfate soils (e.g., acidification, deoxygenation, and salinisation of soil/water systems, and mobilisation of metals ...

  5. Talk:Soil pH - Wikipedia

    en.wikipedia.org/wiki/Talk:Soil_pH

    Also in review of the Hydrangea, the uptake of Aluminum is most important in causing the blue color of the flower. This requires a ph of 5.0 to 5.5 to release the Aluminum from the soil and make it available to the plant. The mere addition of Aluminum Sulfate is not the answer. The ph must be in range as well. 8:42 am EST FEB.17 2007

  6. Action figure - Wikipedia

    en.wikipedia.org/wiki/Action_figure

    The term "action figure" was coined by Hasbro in 1964, to market their G.I. Joe figure to boys who refused to play with "dolls", a term primarily associated as a girl's toy. (A similar toy named Johnny Hero was introduced by Rosko Industries for Sears in 1965, but was known as a "Boy's Doll" since the term action figure had not gained ...

  7. Soil - Wikipedia

    en.wikipedia.org/wiki/Soil

    The effect of pH on a soil is to remove from the soil or to make available certain ions. Soils with high acidity tend to have toxic amounts of aluminium and manganese. [116] As a result of a trade-off between toxicity and requirement most nutrients are better available to plants at moderate pH, [117] although most minerals are more soluble in ...

  8. Topsoil - Wikipedia

    en.wikipedia.org/wiki/Topsoil

    Topsoil is composed of mineral particles and organic matter and usually extends to a depth of 5-10 inches (13–25 cm). Together these make a substrate capable of holding water and air which encourages biological activity.

  9. Soil fertility - Wikipedia

    en.wikipedia.org/wiki/Soil_fertility

    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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