In the southern US, soil pHs of 5.8-6.2 are recommended. Lime should be applied to achieve this pH when possible. In the Midwest, pHs closer to 7 are considered ideal.
If Magnesium (Mg) content of the soil is low or medium, use Dolomitic lime if possible. Calcitic lime may be used when Mg is not a concern.
“For more information on this or other topics related to soybean production, contact your state extension specialist or your local extension educator/agent.”
The following is the link to the soybean extension specialists: state extension soybean specialist