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

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Which type of soil is best for tree growth?

Clay soil

Sandy soil

Loamy soil

Loamy soil is often considered the best type for tree growth due to its balanced composition of sand, silt, and clay, which creates an ideal environment for root development. This balance allows loamy soil to retain moisture without becoming overly saturated, while simultaneously providing excellent drainage. The texture of loamy soil promotes aeration, which is essential for root respiration and nutrient uptake.

Additionally, loamy soil typically has a rich organic matter content, which enhances its fertility and improves the overall health of trees by supplying essential nutrients. Its structure also facilitates the movement of water and air, which are crucial for promoting healthy root systems. This combination of properties makes loamy soil particularly favorable for the establishment and growth of trees in various climatic conditions.

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Rocky soil

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