GNU Collaborative International Dictionary of English

Found one definition

1.       
   Marl, v. t. [imp. & p. p. Marled (?); p. pr. & vb. n. Marling.] [Cf. F. marner. See Marl, n.] To overspread or manure with marl; as, “to marl a field”.
   
   [1913 Webster]