Bah!
Strikes me that the easiest way to dry ground out once it is wet (professional fields attempt to avoid this by covering the fields when it rains) would be to erect a large, transparent, air-supported marquee over it, of the sort used to shelter rooftop tennis courts and suchlike. Kind of like a huge hovercraft skirt. The incident sunlight would get evaporation going and the airflow would keep it going until the ground parched and the grass died of thirst.