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Questions and Answers
Which of the following describes cation exchange capacity?
Which of the following describes cation exchange capacity?
- The amount of organic matter in soil
- The pH level of soil
- The ability of soil to retain water
- One ion replacing another ion (correct)
Soil pH levels between 0-6 are considered neutral.
Soil pH levels between 0-6 are considered neutral.
False (B)
What is humification?
What is humification?
The process by which soil organic matter is changed into humus.
_________ is the conversion of ammonia to nitrite and nitrite to nitrate.
_________ is the conversion of ammonia to nitrite and nitrite to nitrate.
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Match the following soil processes with their definitions:
Match the following soil processes with their definitions:
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Study Notes
Cation Exchange Capacity
- One ion can replace another ion in the soil.
- Clay and humus have the highest cation exchange capacity.
Soil pH
- Measures the amount of hydrogen ions in a solution.
- Impacts crop growth and activity of living organisms in the soil.
- Ranges from 0-6 are acidic, 7 is neutral, and 8-14 are alkaline.
Soil Biomass
- Refers to the total amount of living material in a habitat.
- Includes plants, worms, insects, and bacteria.
- When they die, they become organic matter.
Humification
- Process of converting soil organic matter into humus.
- Macro-organisms like earthworms and bacteria convert organic matter.
- Fungi also play a role in humification.
Role of Organisms in the Carbon Cycle
- Plants remove carbon during photosynthesis and release it through respiration.
- Livestock obtain carbon by eating plants and release it through respiration.
Nutrient Recycling
- Nitrogen fixation converts nitrogen gas into nitrates.
- Nitrogen-fixing bacteria in plant root nodules convert nitrogen gas.
- Nitrification involves the conversion of ammonia to nitrite and then nitrate.
- Denitrification converts nitrates back into nitrogen gas.
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