HOW TO DETERMINE SOIL PH

HOW TO DETERMINE SOIL PH

Soil PH is the measure of Acidity/Alkalinity of the soil.

It is also the concentration of hydrogen ions in the soil.




A soil is Acidic if it has more Hydrogen ions than Hydroxyl ions.

HOW TO DETERMINE SOIL PH

Alkaline: Soil has more OH– ions than H++
Neutral soils have equal amounts of HH and OH- Ions

PH of a soil is measured using the PH scale or meter which runs from 0 – 14.

PH 7 is at Neutral point

The lower the PH the more acidic the soil is while the higher the PH the more Alkaline the soil is

Determination of soil PH

Soil PH can be determined by use of the judicator/dye called – Universal judicator,




  • Soil sample
  • Distilled water
  • Test tubes
  • Barium sulphate
  • Ph colour chart

Procedure

  • Get a small amount of soil and place it in a test tube
  • Add Barium sulphate to help in breaking of soil clods
  • Add distilled water and shake the contents
  • Wait for the contents to settle and then add a Universal indicator solution
  • Hold the test tube against a PH colour chart on which PH values correspond to different
    indicator colours are recorded




  • The exact PH of the soil under investigation is read off the colour chart
  • N.B: Red colour indicates strongly Acidic Blue colour Alkaline Green Neutral

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