When any landlord shall have made advances for agricultural purposes and shall have secured a lien upon the crop of the person to whom such advances may be made, according to the provisions of law relating to agricultural liens, and the amount of such advances does not exceed one hundred dollars, any magistrate of the county in which such lien is indexed may, upon the production of such lien and the proof required in cases in which clerks of the court may issue warrants, issue his warrant directed to a constable or sheriff of the county requiring him to seize such crop and after due notice sell it for cash and apply the net proceeds thereof, or so much thereof as may be necessary, in extinguishment of such lien.