I don't know much about agriculture, but isn't it the case that, apart from favorable climate, soil quality is another important factor here? Currently, pretty

I don't know much about agriculture, but isn't it the case that, apart from favorable climate, soil quality is another important factor here? Currently, pretty much none of Siberia is farmed, even the parts where the climate could permit it - and AFAIR that's because the soil is not conducive to farming. It's similar case in many parts of Africa. Again, please correct me if you know more about it, as my knowledge here is based on Wikipedia.