If defendant alleges that he has a crop sowed, planted or growing on the premises, the judge or jury, finding for plaintiff, and also finding that fact, shall further find the value of the premises from the date of the trial until February 1 next succeeding. No execution for possession shall be issued until that time if the defendant executes, with surety to be approved by the clerk of the court, a bond in double such amount to plaintiff, conditioned to pay at such date the sum so assessed, and if not paid at maturity the court shall enter judgment upon the bond.