Red Seal Landscape Horticulturist Practice Exam

How does soil compaction impact plant health?

1. It enhances nutrient retention in the soil

2. It improves water infiltration and root growth

3. It reduces porosity and inhibits root growth

4. It stimulates faster plant growth

The correct answer is: It reduces porosity and inhibits root growth

Soil compaction significantly impacts plant health by reducing porosity and inhibiting root growth. When soil particles are tightly packed together due to compaction, the spaces between them—known as pore spaces—diminish. These pore spaces are crucial as they allow for air and water movement in the soil. Roots need access to air for respiration and to water for uptake of nutrients. Compacted soils limit these essential elements, resulting in restricted root growth. As roots struggle to expand and grow deeper, they may not access nutrients and moisture found at greater depths, leading to nutrient deficiencies and water stress for the plants. As a consequence of inhibited root growth, plants often exhibit stunted growth, reduced vigor, and can become more susceptible to disease and environmental stress. Overall, understanding the relationship between soil compaction and root development is vital for promoting healthy plant growth and maintaining vibrant landscapes.