Maximize Soybean Yield by Applying Lime for Soil

Agricultural lime is an important input for soybeans for several reasons. Lime for soil can neutralize yield-limiting soil acidity. It adds calcium and magnesium and can increase soil pH and produce significant soybean yield increases.
Yet lime for soil isn’t right for every situation. Here are the pros and cons of agricultural lime so you can determine whether your soybean crop will benefit and, if so, when you should apply lime.

Importance of agricultural lime for soybean yield

If your soybean fields don’t have enough lime, you’ll pay a heavy price in productivity and yield. Low soil pH (below 6.0) reduces nutrient availability and nodulation. As a result, fields can suffer from aluminum toxicity, and yields can fall dramatically.
When you lime your acidic soils, you can experience soybean yield gains between 2.5% and 5%.¹

Pros of lime fertilizer for soybean acres

There are several benefits to liming soybean acres.

Raises soil pH to optimal levels

Study how to raise soil pH, then aim for soil pH of between 6.0 and 6.8 for optimal production.² This improves nutrient availability and root growth.

Supplies calcium and magnesium

These nutrients support strong cell walls and activate enzymes that help soybeans grow.³

Promotes soil biological activity

You can boost soil fertility, improve root growth and overcome negative effects of acidifying fertilizers with the right amount of lime.⁴

Reduces toxicity

Lime fertilizer can reduce the toxicity caused by aluminum and manganese in the soil. Left unchecked, these toxins can impair soybean growth.

Boosts long-term yield and profitability

Because soybeans are an acid-sensitive crop, the right lime application can result in significant long-term yield and profitability increases.

Cons and limitations of lime application

Not every circumstance calls for lime. Here are a few watch-outs.

Requires significant financial investment

Lime application can be expensive. Factor in the costs of purchase, transportation and application. Carefully calculate anticipated ROI based on what your soil needs and management expenses.

Risks over-liming your soil

If you lime soil that’s already above a pH of 5.8 to 6.0, you can make it harder for your crop to use the phosphorus it needs.⁵ You could also restrict iron uptake in your soybeans, causing iron deficiency chlorosis.

Depends on precise timing

You must time application correctly to ensure yield benefits next season. Fall application is often encouraged to give soil pH ample time to rise before planting.

Benefits sometimes require high lime rates

If some or all of your fields have high buffering capacity, you’ll need to use a greater quantity of lime, which may negatively affect short-term profitability.

How to determine if liming will benefit your soybean crops

You can take several steps to determine if agricultural lime is right for your soybean fields.
First, conduct soil testing. Divide your land into uniform field areas so that you’re capturing all relevant soil types, management practices, cropping history, terrains and field sizes. Take 20 soil cores each .75” thick at a consistent depth.⁶ For accurate lime levels, it’s important to sample at 3” depth into the soil to get below the soil surface. Check both water pH (active acidity) and buffer pH (reserve acidity) to determine your lime fertilizer needs and optimal rate. If two tons per acre or less is needed, you can apply it anytime. You’ll need to consider applications over several years or a split application if more than four tons per acre is needed. Never apply more than 8 tons per acre in a single season.⁷
Next, recall an important rule of thumb: Soybean fields with a pH below 6.0 almost always benefit from liming, while those at or above 6.0 might experience limited benefits.
Third, recognize that a single lime rate might not be ideal. Variable-rate applications might be necessary in fields with diverse soil types or landscape positions.

Best timing and practices for lime application in soybeans

If you decide liming is needed, apply it at least three to six months before planting. This will allow for full neutralization and soil reaction.
One exception: You can apply lime immediately before spring planting of soybeans if your product is finely ground for fast action.
Use soil-test recommendations to guide agricultural lime rates and avoid overapplication. Split applications might be a good fit for fields that need high lime rates and in no-till fields.
Experts are available to help you make your pre-planting management decisions. Reach out to your seed retailer, a nearby extension office agent or a seed company professional like your regional BASF representative.

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Endnotes

1. Vetsch, Jeff. “New Research Shows Increased Yield with Liming Treatments.” University of Minnesota Extension, 1 Jan. 2024, https://blog-crop-news.extension.umn.edu/2018/01/jeff-vetsch-soil-scientist-when-needed.html. Accessed 13 Oct. 2025.
2. “Changing the Soil pH.” Plant & Soil Sciences eLibrary, University of Nebraska–Lincoln, https://passel2.unl.edu/view/lesson/d2b52174b1a7/7. Accessed 13 Oct. 2025.
3. Larry Oldham and Keri D. Jones. Calcium and Magnesium in Mississippi Crop Production. Mississippi State University Extension Service Publication P3727, Mississippi State University Extension Service, n.d., https://extension.msstate.edu/publications/calcium-and-magnesium-mississippi-crop-production. Accessed 21 Oct. 2025.
4. Bossolani, João William, et al. “Long-Term Liming Improves Soil Fertility and Soybean Root Growth, Reflecting Improvements in Leaf Gas Exchange and Grain Yield.” European Journal of Agronomy, vol. 128, Aug. 2021, https://www.sciencedirect.com/science/article/abs/pii/S1161030121000800. Accessed 21 Oct. 2025.
5. “Soil Test pH and Liming: Common Questions and Answers.” Minnesota Crop News, University of Minnesota Extension, 14 Mar. 2024, https://blog-crop-news.extension.umn.edu/2024/03/soil-test-ph-and-liming-common.html. Accessed 13 Oct. 2025.
6. Warncke, Darryl D. Sampling Soils for Fertilizer and Lime Recommendations. Extension Bulletin E498, Michigan State University Extension, Sept. 2000, https://www.canr.msu.edu/uploads/resources/pdfs/soil_sampling_guide_(e0498).pdf.
7. “Fertilization Recommendations.” Agronomic Crops Network, Ohio State University Extension, https://agcrops.osu.edu/node/4348. Accessed 13 Oct. 2025.