Welcome to the forum.
Maybe a little more information might help folks to determine what the problem is.
What part of the world are you in? What is your grow zone? Just give folks a general idea of what part of the world.
What kind of soil do you have?
How much rainfall do you get a year?
Have you tried the paper towel method to germinate your seeds?
If the
land has been farmed for 50 years maybe all the nutrients are gone.
Maybe building up your soil health will help:
List of
Bryant RedHawk's Epic Soil Series Threads
https://permies.com/wiki/redhawk-soil
I have always found pinto beans will grow really well anywhere I have ever lived.