If at said hearing or at any adjournment thereof, the board of directors shall determine that said land is not susceptible of irrigation and will not be benefited as aforesaid by inclusion in the district, or if more than fifty percent of the holders of title to or evidence of title to the land described in the petition file their objections in writing within the time and as aforesaid, then the board of directors shall deny said petition and shall make and enter in the records of their proceedings an order to that effect.