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Mullamaa (Mullamaa)

Term not found in any bilingual online dictionary. Saagpakk gives ‘mold’, EKSS gives various explanations revolving around rich, piled-up earth, and sonaveeb.ee suggests rohke mullaga, mullakas maa, so I’m going with this: ‘rich loamy land or soil’. Mulla põik since 1958 then this from 2017. Street abutting Kesa. Pending... Can any agronomists help here?