The freezing temperatures prevents most. Frozen ground, very little sunlight, and lack of flowing water (can't benefit from water that does not melt). There's not a long enough growing season for any large flora to be present.
The soil named chernozem is a black colored soil found in Russia and has a high percentage of the humus contents that is 4 to 16% and consists of the folic acid and phosphorous and the ammonia.
Thus is very fertile soil and has a high agricultural yield and this soil consist of the high moisture storage capacity thus is supportive of the large agricultural cultivation.
