Episode Details

This episode explains soil water movement, drainage, and aeration for the ISA Arborist Certification Exam. Understanding how water and oxygen interact in soil is essential for diagnosing both drought stress and flooding-related decline.You’ll learn the difference between gravitational water and plant-available water, what field capacity means, and why poorly drained soils often cause root stress even when moisture is present. This episode connects soil physics directly to root health and canopy symptoms.This podcast is part of a larger ISA Arborist Certification study series focused on soil function and tree–soil relationships tested on the exam.