Landscaping License Practice Test

How much compost should be added to soils with less than six percent organic matter in the top six inches?

1. 2 cubic yards per 1,000 square feet

2. 4 cubic yards per 1,000 square feet

3. 6 cubic yards per 1,000 square feet

4. 8 cubic yards per 1,000 square feet

The correct answer is: 4 cubic yards per 1,000 square feet

Adding compost is essential for improving soil structure, fertility, and moisture retention, particularly in soils with low organic matter content. When soils have less than six percent organic matter, it is commonly recommended to apply compost to enhance their quality. The practice of applying around four cubic yards of compost per 1,000 square feet is based on ensuring that the soil can effectively absorb and utilize the organic material without overwhelming it. This specific quantity is sufficient to significantly improve the organic matter content, fostering healthier plant growth and enhancing the overall ecosystem of the soil. Using a more substantial amount, such as six or eight cubic yards, could lead to diminishing returns as the soil may not be able to incorporate such large amounts effectively. Over application may also result in nutrient imbalances or issues with water drainage. Thus, four cubic yards per 1,000 square feet strikes the right balance for the enhancement of soils with low organic matter while avoiding potential complications from excess compost.