CSLB C-27 Landscaping ContractorSite Preparation and DrainageMedium
A landscape contractor is assessing a site for a new lawn installation. The existing soil exhibits severe compaction due to heavy construction traffic. To ensure optimal root development and water infiltration for the new turf, which soil preparation technique would be most beneficial?
- AImplementing a no-till approach to preserve existing soil structure.
- BBroadcasting a calcined clay amendment over the surface.
- CApplying a deep layer of sand to improve drainage.
- DTilling in a significant quantity of organic matter to a depth of 6-8 inches.
Show answer & explanationAnswer & explanation
Correct answer: D. Tilling in a significant quantity of organic matter to a depth of 6-8 inches.
Severe compaction requires breaking up the soil structure and incorporating organic matter. Tilling in organic matter to a significant depth (6-8 inches) effectively loosens compacted soil, improves aeration, enhances water infiltration, and promotes healthy root growth.
Why the other options are wrong
- A. A no-till approach is beneficial for already healthy soils but is ineffective for severely compacted soil that needs its structure physically broken up and amended.
- B. Calcined clay can improve drainage and aeration to some extent, but it's not as effective as organic matter for severe compaction and overall soil health improvement.
- C. Adding sand to compacted soil, especially clay, can create a concrete-like mixture, worsening compaction rather than improving it.
Compacted Soil Remediation
Techniques used to alleviate soil compaction, improving aeration, drainage, and root penetration.
- Tilling breaks up compacted layers.
- Organic matter improves soil structure and water retention.
- Severe compaction requires aggressive intervention.
Memory trick: TILL and COMPOST to make compacted soil THRIVE.