Douglas Harper's Etymology Dictionary
1842, from Russian chernozem, literally "black earth," from chernyi "black," from PIE *kers- "dark, dirty" (see Krishna) + zemlya "earth, soil," from Old Russian zemi "land, earth," from PIE *dhghem- "earth" (see chthonic).
Wiktionary
n. A fertile black soil containing a very high percentage of humus (3% to 15%) and high percentages of phosphoric acids, phosphorus and ammonia.
Wikipedia
Chernozem (from , translated as "black soil, dirt or earth") is a black-coloured soil containing a high percentage of humus
(7% to 15%), and high percentages of phosphoric acids, phosphorus and ammonia. Chernozem is very fertile and produces a high agricultural yield.
Usage examples of "chernozem".
Young of Sanaigmore Farm and Erinys House, Elysium, had died tragically in a hotel fire on the "Russian" planet Chernozem, leaving his four wards as his only heirs.