Certified Storm Water Operator Practice Exam

What is the recommended tonnage of straw mulch to be applied immediately following seeding per acre?

1. One ton

2. Two tons

3. Three tons

4. Four tons

The correct answer is: Two tons

Applying straw mulch immediately after seeding is a critical practice in erosion control and moisture retention for newly established vegetation. The recommended tonnage of two tons per acre is based on achieving an adequate cover that assists in preventing erosion, regulating soil temperature, and conserving moisture while allowing light to permeate for seed germination. This amount provides a sufficient barrier against raindrop impact, which can dislodge seeds and soil. Additionally, this moderate application rate balances effectiveness with cost, ensuring that land managers can achieve environmental goals without excessive expense or material waste. Higher or lower tonnages may compromise either the efficiency of the mulch or the economic viability of the practice. A lighter application may not provide adequate coverage or benefits, while heavier applications can be cost-prohibitive and potentially lead to issues with compacting the soil or obstructing seedling growth. Therefore, the two-ton recommendation reflects an optimal balance that supports the establishment of healthy plant communities in disturbed areas.