ISA Certified Arborist Practice Exam

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Prepare for the ISA Certified Arborist Exam with detailed flashcards and multiple-choice questions, each offering hints and explanations. Ace your certification test!

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What is the term for air filled soil macropores?

Buffering Capacity
Gravitational Water
Micropores
Field Capacity

The correct answer is: Buffering Capacity

Air-filled soil macropores refer to the spaces within the soil that are filled with air rather than water. These pores are essential for the exchange of gases vital for soil and plant health. "Buffering Capacity" refers to the ability of a soil to resist pH changes. "Gravitational Water" is the water that drains freely through the soil due to gravity. "Micropores" are tiny spaces in the soil that hold water against gravitational forces. "Field Capacity" is the maximum amount of water soil can hold against gravity before excess water drains away. Therefore, the term for air-filled soil macropores is correctly identified as "Buffering Capacity."