Show COPPER ZINC AND MANGANESE OF VALUE IN cultivating FARMS T THE HE ATTEMPT to produce crops on the drained everglades lades of florida has taught us soi something new in agriculture b iture says a recent bulletin of the zinc institute while certain portions of the everglades b bore crops other parts renia remained ined barren and refused to respond to the usual fertilizers the experiment station established by the university of florida however hoN vever discovered that these lands would respond with satisfactory crops when treated with copper sulphate this led to experiments with other metallic salts and to the knowledge that crops definitely need the metals copper manganese and zinc the experiment station recommends that the salts of these metals should be added to all commercial fertilizers this appears to mark a fundamental discovery of great future benefit to man |