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Lime and Tillage Research Project

Introduction Farmers growing corn and soybeans in northwest Iowa have to consider the cost of aglime when liming their soils. This is because of the high limestone cost and the fact that the soils in northwest Iowa have high pH subsoil, which moderates the negative effect of acid surface soils. Another factor that must be considered is the variable mixing of limestone into the soil with different tillage systems. The different amounts of soil mixing between no-till systems, ridge till systems, and conventional tillage systems may affect the amount of limestone needed to correct the soil pH, crop yields, and the needed limestone rate.