CASE 3.2 Principles of pH.

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Lesson 3.2 Principles of pH

Presentation transcript:

CASE 3.2 Principles of pH

What is pH? pH is the measure of acidity or alkalinity in a soil. Acid is a term used for a substance with a pH value less than 7.0. Alkaline (aka, Base) is a term used for a substance with a pH value greater than 7.0.

pH Scale pH is measured on a scale of 0 - 14 pH value of 7.0 is neutral

pH Scale The pH scale is special in that each pH point multiplies the pH factor by 10. For example: A pH of 5.0 is 10 times more acidic than pH 6.0 and 100 times more acidic than pH 7.0. Distilled water would be an example of a pH neutral substance.

Who cares about pH? Plant producers Animal producers A correct soil pH allows plants to uptake soil nutrients required for growth and health. Certain soil nutrients become unavailable at different pH levels. If pH is not optimal for the plant, many nutrients added in the form of fertilizer are washed away rather than used for plant growth and health. Animal producers Nutrient uptake in digestion Agricultural scientists Food preservation

Buffers Chemical substances that neutralize acids or bases when added to a solution