By Scout Nelson
Deciding when and where to apply lime to soil can be challenging, especially on rental land. Since the benefits of liming may take years to manifest, it’s essential to determine where lime applications are most economical. Minnesota currently has two lime recommendation systems based on sub-soil acidity; a factor influenced by the parent material of soils across the state.
A study is underway to evaluate the long-term benefits of lime applications in Minnesota. The research also aims to reassess the current lime guidelines and determine if updates are needed to better align with modern cropping practices. Lime has been part of Minnesota’s agricultural history for over 100 years, but changes in how lime is applied and recommended have evolved over time.
A major shift in the 1970s replaced water pH tests with buffer pH methods to calculate lime requirements. Buffer pH is more effective in estimating the amount of lime needed to neutralize acidic soils.
Funded by the Minnesota Soybean Research and Promotion Council, the study is investigating whether central Minnesota should be included in a different lime recommendation zone.
New field trials are being sought in areas with surface soil pH near 5.0 or less, and current trials are ongoing to monitor yield changes and soil pH impacts. The research team will continue to provide updates as the study progresses over the next few years.
Photo Credit:minnesota-soybean-council
Categories: Minnesota, Crops, Soybeans, General