Can You Spread Lime With a Fertilizer Spreader?

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Can You Spread Lime With a Fertilizer Spreader? A Guide to Application

The answer is yes, under certain conditions. You can spread lime with a fertilizer spreader, but it’s crucial to choose the right type of lime, spreader, and application method to ensure even coverage and avoid damage to your equipment.

The Importance of Soil pH and Liming

Healthy soil is the foundation for thriving plants. One of the most critical aspects of soil health is its pH, a measure of acidity or alkalinity. Most plants prefer a slightly acidic to neutral pH (around 6.0 to 7.0). When soil becomes too acidic (pH below 6.0), essential nutrients become less available to plants, hindering their growth and making them more susceptible to diseases.

Liming is the process of adding calcium-rich materials to the soil to neutralize acidity and raise the pH level. This practice unlocks nutrients like phosphorus, potassium, and nitrogen, allowing plants to absorb them effectively. Regularly testing your soil pH is vital to determine if liming is necessary. Your local agricultural extension office can provide soil testing kits and recommendations.

Types of Lime Suitable for Spreading

Not all lime is created equal. The suitability of a particular lime product for spreading with a fertilizer spreader depends largely on its particle size and composition. Here are some common types:

Agricultural Lime (Ground Limestone): This is the most common and affordable option. It’s made from finely ground limestone rock (calcium carbonate). While effective, its dusty nature can pose challenges for spreading.
Dolomitic Lime: Similar to agricultural lime, but also contains magnesium. This is beneficial in soils deficient in magnesium. The same spreading considerations apply as with agricultural lime.
Pelletized Lime: This is ground limestone that has been formed into small, uniform pellets. Pelletized lime is the best option for spreading with a fertilizer spreader due to its consistent size and flowability. It also produces less dust.
Hydrated Lime (Slaked Lime): Highly reactive and fast-acting, but also caustic and can burn plants if applied incorrectly. Not recommended for use in fertilizer spreaders due to its fine texture and potential for clumping.

Choosing the Right Fertilizer Spreader

The type of fertilizer spreader you use significantly impacts the effectiveness of lime application.

Drop Spreaders: These spreaders drop the lime directly below the spreader, creating a precise but narrow band of coverage. They are less susceptible to wind drift but require more passes to cover an area. Generally not recommended for granular lime because the particles can clump and stop the flow.
Broadcast (Rotary) Spreaders: These spreaders use a spinning disc to distribute the lime over a wider area. They are faster and more efficient for covering large areas, but are more susceptible to wind drift. Best suited for pelletized lime due to their ability to handle granular materials.
Tow-Behind Spreaders: Larger capacity spreaders that are pulled behind a tractor. Typically, these can handle a larger spread rate and heavier materials. Often use the broadcast spreading method.
Handheld Spreaders: Smaller, manual spreaders that are good for small areas.

Table: Comparison of Spreader Types for Lime Application

Spreader Type	Suitability for Lime	Pros	Cons
Drop Spreader	Low	Precise application, less wind drift	Can clog easily with lime, slow application, narrow coverage.
Broadcast Spreader	High (pelletized)	Fast application, wide coverage, good for large areas, best for pelletized	More susceptible to wind drift, requires careful calibration
Tow-Behind Spreader	Medium	High capacity, can cover large areas, compatible with tractors.	Requires a tractor, may still require careful calibration.
Handheld Spreaders	Low to Medium	Good for small areas, manual control	Limited capacity, uneven distribution possible, tiring to operate.

Step-by-Step Lime Application Process

Soil Test: Conduct a soil test to determine the existing pH and the recommended lime application rate.
Lime Selection: Choose the appropriate type of lime based on soil test recommendations and spreader capabilities. Pelletized lime is generally the easiest to work with.
Spreader Calibration: Calibrate your fertilizer spreader to ensure accurate application. This involves adjusting the settings and measuring the amount of lime dispensed over a specific distance. This may take multiple passes to get right.
Application: Evenly apply the lime across the desired area. Overlap passes slightly to ensure uniform coverage. Always wear appropriate safety gear, including gloves and a dust mask.
Incorporation (Optional): If possible, incorporate the lime into the soil by tilling or raking. This speeds up the reaction process. This isn’t always necessary but can significantly improve effectiveness.
Watering (Optional): Watering the treated area can help the lime react with the soil more quickly.
Re-test: Re-test the soil pH after a few months to assess the effectiveness of the lime application and determine if further adjustments are needed.

Common Mistakes to Avoid

Using the Wrong Type of Lime: Selecting a lime type incompatible with your spreader can lead to clumping and uneven application.
Incorrect Calibration: Failing to properly calibrate the spreader results in over- or under-application, leading to nutrient imbalances or ineffective pH correction.
Spreading on a Windy Day: Wind can significantly affect the distribution of lime, especially with broadcast spreaders.
Neglecting Safety Precautions: Lime dust can irritate the skin and respiratory system. Always wear appropriate protective gear.
Applying Lime Too Close to Plants: While lime is generally beneficial, direct contact with plant foliage can cause burning.

Frequently Asked Questions About Spreading Lime

Can I use a Scotts EdgeGuard Mini Broadcast Spreader to spread pelletized lime?

Yes, you can use a Scotts EdgeGuard Mini Broadcast Spreader for pelletized lime. It’s designed for granular materials, and pelletized lime will flow better than traditional ground lime. However, calibration is crucial. Start with a low setting and gradually increase it while monitoring the application rate to ensure even coverage and avoid over-application.

How often should I apply lime to my lawn?

The frequency of lime application depends on several factors, including soil type, rainfall, and the type of plants you’re growing. Generally, a soil test every 1-3 years will determine whether lime is needed. Sandy soils tend to acidify more quickly than clay soils.

What is the best time of year to apply lime?

The best time to apply lime is in the fall or early spring, allowing sufficient time for it to react with the soil before planting season. Fall applications are often preferred as the freeze-thaw cycle helps incorporate the lime into the soil.

Will lime harm my earthworms?

When used correctly, lime should not harm earthworms. In fact, by improving soil pH and making nutrients more available, lime can indirectly benefit earthworms by enhancing the health of the soil ecosystem. However, excessive amounts of lime can be detrimental.

How long does it take for lime to change the soil pH?

The time it takes for lime to affect soil pH depends on several factors, including the type of lime, particle size, soil type, and moisture levels. In general, it can take several weeks to months for noticeable changes to occur. Pelletized lime tends to react faster than ground limestone.

Can I spread lime on top of snow?

Spreading lime on top of snow is not recommended. The snow can create an uneven distribution and hinder the lime’s ability to reach the soil. Additionally, the snowmelt can wash away the lime before it has a chance to react.

How do I calibrate my fertilizer spreader for lime?

Calibration involves measuring how much lime your spreader dispenses over a known distance. Start by selecting a setting. Then, spread lime over a tarp or designated area. Weigh the collected lime and adjust the setting accordingly until you achieve the desired application rate per square foot/meter. Repeat the process to refine the setting. Consult the spreader’s manual for specific instructions.

Can I mix lime and fertilizer in the spreader?

Mixing lime and fertilizer in the spreader is generally not recommended. Some fertilizers react negatively with lime, potentially reducing their effectiveness or creating harmful compounds. It’s best to apply lime and fertilizer separately, following the recommendations of a soil test.

What safety precautions should I take when spreading lime?

Always wear protective gear when handling lime, including:

Gloves
Dust mask or respirator
Eye protection (goggles or safety glasses)
Long sleeves and pants

Avoid inhaling lime dust and wash your hands thoroughly after handling.

How do I know if I’ve applied too much lime?

Signs of over-liming include chlorosis (yellowing of leaves) due to nutrient deficiencies, especially iron. A soil test will confirm if the pH is too high. If over-liming occurs, adding acidic amendments like elemental sulfur can help lower the pH.

What’s the difference between lime and gypsum?

While both lime and gypsum are soil amendments, they serve different purposes. Lime raises soil pH, while gypsum improves soil structure and drainage without significantly affecting pH. Gypsum is also a source of calcium and sulfur.

Is it okay to use lime on a vegetable garden?

Yes, it is perfectly acceptable to use lime on a vegetable garden, especially if the soil is acidic. Many vegetables prefer a slightly acidic to neutral pH (around 6.0 to 7.0). Amending with lime allows your plants to thrive.