ISA Certified Arborist Practice Exam

What is the soil condition after gravitational water has drained?

1. Buffering Capacity

2. Gravitational Water

3. Field Capacity

4. Micropores

The correct answer is: Field Capacity

After gravitational water has drained, the remaining moisture in the soil is referred to as "field capacity." This is the maximum amount of water that the soil can hold after it has been drained by gravity. Option A, buffering capacity, refers to the ability of soil to resist changes in its pH levels. Option B, gravitational water, is the water that moves downward through the soil due to the force of gravity. Option D, micropores, are small pores in the soil that hold water or air. These options do not accurately describe the soil condition after gravitational water has drained, making them incorrect choices.