ISA Certified Arborist Practice Exam 2025 - Free ISA Arborist Practice Questions and Study Guide

Soil testing provides information about the water holding capacity of the soil. This is important for arborists as it helps them understand how well the soil can retain moisture and make informed decisions regarding irrigation and proper root growth.

Option B, infiltration rate, refers to how quickly water can penetrate the soil's surface, which is related to water movement in the soil but is not the primary focus of soil testing.

Option C, coarse textured particles, is more related to the physical composition of the soil rather than what soil testing specifically provides information about.

Option D simply states "soil testing," which is not a specific aspect that soil testing provides information about in relation to the soil. The purpose of soil testing is to gather specific data about the soil's characteristics, such as its water holding capacity.