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top layer of soil, often containing organic material, from which chemical substances are leached into the subsoil below. The topsoil is the part of the soil which is cultivated and in which most plants roots are formed, ülemine mullakiht
maa-aines . EKI terminibaas Esterm. Estonian Language Institute, Sõnaveeb 2026. https://sonaveeb.ee/search/unif//esterm/maa-aines/1/est (11.07.2026)
