chernozem

/ˈt͡ʃɜː(ɹ)nəˌzɛm/
noun
  1. 1

    A fertile black soil containing a very high percentage of humus (3% to 15%) and high percentages of phosphoric acids, phosphorus and ammonia.

Synonyms

Source: https://en.wiktionary.org/wiki/chernozem