Mich. Comp. Laws § 600.6036
When a levy is made upon grain while growing, or on any unharvested crops by virtue of any execution, the officer making such levy shall file a notice of said levy in the office of the register of deeds of the county in which such grain or crops are at the time of making such levy; and such register of deeds shall file said notice in his office, in the same manner as he is required by law to file a chattel mortgage; and such notice shall be constructive evidence to all persons of the interest of the plaintiff in the execution, and shall be entitled to the same fees therefor, to be paid by the plaintiff in the execution, and shall be collected as costs in the case, and no sale of said crops or grain may be made until the same are ripe or fit to be harvested, and any levy thereon by virtue of an execution issued from a circuit court, shall be continued beyond the return day thereof, if necessary, and remain in life, and the execution thereof may be completed at any time within 30 days after such grain or other unharvested crops are ripe or fit to be harvested.
MCL 600.6036