Lime for Lawns: A Comprehensive Guide
What is Lime?
Lime is a natural soil amendment primarily composed of pulverized limestone. Its chemical form is calcium carbonate, an inorganic salt. It is commonly used in lawns to raise the pH level of acidic soil.
Benefits of Using Lime on Lawns
The primary benefit of lime on lawns is its ability to neutralize soil acidity. This is especially important for lawns in warm climates with high rainfall, as soil acidification occurs more rapidly in these conditions. By raising the pH level to 7.0 or above, lime creates a more optimal environment for grass growth.
Types of Lime for Lawns
There are two main types of lime for lawns:
- Calcitic lime: Raises the pH level effectively, improves soil health, and works more quickly than dolomitic lime.
- Dolomitic lime: In addition to raising the pH level, it also increases soil magnesium, improves drainage and aeration in sandy soil, and enhances overall soil health. However, it can add too much magnesium to the soil, create compaction in soils other than sand, and be slow-acting.
When to Apply Lime to Lawns
Lime should only be applied to lawns when the grass is actively growing. For cool-weather turf grasses, apply lime in the fall. For warm-weather turf grasses, apply lime in the spring.
How to Apply Lime to Lawns
- Conduct a soil test: Determine the pH level of your soil before applying lime.
- Aerate the lawn: This helps the lime penetrate the soil more effectively.
- Use a rotary spreader: Fill the spreader with lime and distribute it evenly over the lawn in parallel lines.
- Walk perpendicularly on the rest of the lawn: This ensures complete coverage.
- Water the lawn: Immediately after spreading the lime, water it thoroughly to help it absorb into the soil.
How Much Lime to Apply
The amount of lime to apply depends on the results of your soil test. If the test calls for 50 lbs or less per 1000 square feet, you can apply it in one application. If more than 50 lbs is required, divide the application into two parts, one in the spring and one in the fall.
Causes of Soil Acidity
Soil acidification occurs naturally due to factors such as rainfall and soil composition. However, human activities, such as excessive fertilizer use, can also contribute to acidification by altering the nitrogen balance in the soil.
FAQs
- Can you put too much lime on your lawn?
Yes, excessive lime can raise the pH level too high, damaging the grass.
- Do you fertilize the lawn or add lime first?
Fertilize and water the lawn before applying lime.
- What are the signs that your lawn needs lime?
Common signs include sandy or clay soil, poor grass growth, and an abundance of moss.
- Will lime make my lawn greener?
Lime may contribute to a greener lawn, but it can take several months to see results. A soil test is recommended to confirm whether lime is the solution.
Additional Tips
- Always conduct a soil test before applying lime to determine the appropriate amount.
- Use a high-quality lime product for best results.
- Apply lime when the weather is dry to prevent clumping.
- Avoid applying lime to lawns with a pH level of 7.0 or above.
