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CASE 3.2 Principles of pH

pH measures the acidity or alkalinity of soil on a scale from 0 to 14. Substances with a pH below 7 are acidic, while those above 7 are alkaline, with a pH of 7 considered neutral. The pH level impacts nutrient availability essential for plant growth. A correct soil pH ensures optimal nutrient uptake, preventing loss of fertilizers through runoff. Buffers are chemical substances that help maintain pH levels in solutions, crucial for agricultural practices and food preservation. Understanding pH is vital for farmers, agricultural scientists, and anyone involved in plant or animal production.

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CASE 3.2 Principles of pH

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  1. CASE 3.2 Principles of pH

  2. 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.

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

  4. 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.

  5. Who cares about pH? • Plant 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

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

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