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2. Soil pH - Wikipedia

   en.wikipedia.org/wiki/Soil_pH

   The pH of an alkaline soil can be reduced by adding acidifying agents or acidic organic materials. Elemental sulfur (90–99% S) has been used at application rates of 300–500 kg/ha (270–450 lb/acre) – it slowly oxidises in the soil to form sulfuric acid.

3. pH indicator - Wikipedia

   en.wikipedia.org/wiki/PH_indicator

   In alkaline soils, these reactions cannot occur and therefore aluminium is not taken up by the plant. As a result, the flowers remain pink. Another natural pH indicator is the spice turmeric. It turns yellow when exposed to acids and reddish brown when in presence of an alkalis.

4. Alkali soil - Wikipedia

   en.wikipedia.org/wiki/Alkali_soil

   Alkali, or alkaline, soils are clay soils with high pH (greater than 8.5), a poor soil structure and a low infiltration capacity. Often they have a hard calcareous layer at 0.5 to 1 metre depth. Alkali soils owe their unfavorable physico-chemical properties mainly to the dominating presence of sodium carbonate , which causes the soil to swell ...

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. pH - Wikipedia

   en.wikipedia.org/wiki/PH

   The measurement of pH can become difficult at extremely acidic or alkaline conditions, such as below pH 2.5 (ca. 0.003 mol/dm 3 acid) or above pH 10.5 (above ca. 0.0003 mol/dm 3 alkaline). This is due to the breakdown of the Nernst equation in such conditions when using a glass electrode.

7. Universal indicator - Wikipedia

   en.wikipedia.org/wiki/Universal_indicator

   A roll of universal indicator pape Colors of universal indicator. A universal indicator is a pH indicator made of a solution of several compounds that exhibit various smooth colour changes over a wide range pH values to indicate the acidity or alkalinity of solutions. A universal indicator can be in paper form or present in a form of a solution ...