What is soil ph?

Soil PH

The soil pH is a measure of the acidity or basicity in soils. pH is defined as the negative logarithm (base 10) of the activity of hydronium ions (H+ or, more precisely, H3O+
aq) in a solution. It ranges from 0 to 14, with 7 being neutral. A pH below 7 is acidic and above 7 is basic. Soil pH is considered a master variable in soils as it controls many chemical processes that take place. It specifically affects plant nutrient availability by controlling the chemical forms of the nutrient. The optimum pH range for most plants is between 6 and 7.5, however many plants have adapted to thrive at pH values outside this range.

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Some articles on soil ph:

Changing Soil PH - Decreasing PH of Basic Soil
... organic matter in the form of plant litter, compost, and manure will decrease soil pH through the decomposition process ... organic matter such as pine needles, pine sawdust and acid peat are effective at reducing pH ...
Soil Conservation - Soil PH
... Soil pH levels adverse to crop growth can occur naturally in some regions it can also be induced by acid rain or soil contamination from acids or bases ... The role of soil pH is to control nutrient availability to vegetation ... sulfur) prefer neutral to slightly alkaline soils ...
Phialophora Gregata - Management - Monitoring Soil PH
... Soil pH has been shown to have an effect on brown stem rot ... Maintaining a soil pH of 7.0 reduces the risk of disease the greatest ...
Pachypodium Habitats - Soil Chemistry - Soil PH
... measured the pH levels for the soil in half the sites of Pachypodium endemic to Madagascar ... The pH ranges approximately from 3.5 to 7 ... Strictly acid soils that had a pH level of 3.5 to 5 were preferred by Pachypodium brevicaule, P ...

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