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Welcome to the Soil Fertility Lab's website. Our work focuses on determining timely and efficient use of fertilizers, developing farmer-friendly soil health tests, and understanding how long-term management strategies can build organic matter and soil productivity. We engage and work collaboratively with farmers, crop consultants, and educators on a wide variety of soil fertility and management issues.


  1. What to do about Nitrogen Fertilizer in Corn?

    Jul 8, 2019

    The most recent Agronomic Crops Network C.O.R.N. newsletter contains an article addressing common questions about nitrogen (N) fertilizer applications in corn. The article addresses concerns due to persistent rain this year causing concern about N loss from denitrification and leaching. Common questions being asked are addressed and include:

    Do I need additional N?

    What tools can help me determine if I need additional N?

    How late and how much N should be applied?

    What is the best N source to use?

    The full article can be accessed HERE

  2. New fact sheet reporting relationships between soil test extractants published by Culman Lab

    Jun 18, 2019

    The Soil Fertility Lab has published a fact sheet reporting their results investigating the relationships between commonly used soil test extractants in the Tri-State Region. The fact sheet reports findings for soil samples collected in Ohio and Indiana from a diverse range of fields. Soils were tested for Mehlich-3, Bray-P, and ammonium acetate extractable nutrients for phosphorus (P), potassium (K), calcium (Ca), and magnesium (Mg). The summary of findings can be found in the full news article and the fact sheet can be found HERE

  3. The Soil Fertility Lab has two new graduates!

    Apr 30, 2019

    We are excited to announce that the Culman Lab has two new graduates! Congratulations to Jordon Wade and Noely Gonzalez-Maldonado on completing their graduate degrees. Jordon's PhD dissertation, entitled "Soil Health and Nutrient Dynamics in Agroecosystems of the Midwestern US", focused on elucidating how soil health measurements influence and are influenced by fertilizer applications. Noely's MS work, entitled "Evaluating the Effects of Long-Term No-Till and Crop Rotations in Soil Health and Corn Productivity, focused on determining the effects of half a century of continuous no-till and crop rotation on soil health and its relationship with crop productivity. Both theses will be made available on our website soon!