Two more West Marin ranches, including one of the largest in the county, will soon be added to the portfolio of farmland protected from development by the Marin Agricultural Land Trust.

Last week, the Board of Supervisors approved $3.3 million in farmland preservation grants to help MALT purchase easements that will keep the Bivista Ridge Ranch and Spring Valley Ranch  in agricultural production forever. Funding for the county grants, which protect farmlands of ecological…