QUIZ ACTIVITY 5.5: SOIL pH AND REDOX POTENTIAL

What is the optimum pH range for most plants?

• 4.0-5.5

• 5.5-.7.0

• 7.0-8.5

• 8.5-10.0

What does soil pH primarily control in the soil?

• Soil texture

• Soil structure

• Chemical processes

• Soil color

Which factor is NOT a primary determinant of soil redox potential?

• Microbial activity

• Availability of electron acceptors

• Soil texture

• Soil moisture

Which of the following cations is NOT typically associated with alkaline soils?

• K+ (Potassium)

• Ca2+ (Calcium)

• Mg2+ (Magnesium)

• H+ (Hydrogen)

Redox potential is an indication of the soil's capacity to do what?

• Absorb nutrients

• Exchange cations

• Transfer electrons

• Retain water

Soil pH affects plant nutrient availability by controlling the chemical forms of the nutrients.

• TRUE

• FALSE

Applying ammonium-based fertilizers increases soil pH.

• TRUE

• FALSE

Microorganisms play a crucial role in controlling the redox status of soils by using oxygen or other molecules as electron acceptors.

• TRUE

• FALSE

The redox potential of soil is primarily determined by the soil's color and texture.

• TRUE

• FALSE

Increasing soil organic matter decreases the soil's buffering capacity.

• TRUE

• FALSE