JOSE MANUEL RECIO ESPEJO2026-01-292026-01-29202110.2478/eko-2021-00342-s2.0-85122803184https://www.scopus.com/inward/record.uri?eid=2-s2.https://ucocris.uco.es/handle/123456789/34477EcologyPrediction of Soc in Calcic Chernozem in the Steppe Zone of Ukraine Using Brightness and Colour Indicatorsresearch article