Soil Acidity Concepts and Measurement

This set of flashcards covers key concepts related to soil acidity, its measurement, and management strategies.

What is the significance of pH in soil chemistry?

pH is a master variable that influences nutrient availability, trace metal toxicity, and plant response to soil acidity.

How is soil pH commonly determined?

Soil pH is usually measured after equilibrating a soil with distilled water or a salt solution.

What are exchangeable acidity and its components?

Exchangeable acidity consists of adsorbed Al3+ and H+ ions that can be readily extracted by neutral salt.

What is the effect of CO2 on soil acidity?

CO2 can dissolve in water to form carbonic acid, contributing to soil acidity.

What role does organic matter play in soil acidity?

Organic matter releases organic acids that account for soil acidification, especially at lower pH values.

What is the concept of reserve acidity?

Reserve acidity includes all forms of acidity associated with the solid phase of soil, indicating its buffer capacity.

How do aluminum ions affect soil acidity?

Al3+ ions and their hydrolysis species are toxic to plants and contribute to soil acidity.

What are basic management strategies to reduce soil acidification?

Strategies include minimizing acidifying fertilizers and returning plant material to the soil.