Experiment device for plant retention element for dynamic analog control of ammonium nitrogen in three-phase medium

The invention relates to an experiment device for a plant retention element for dynamic analog control of ammonium nitrogen in a three-phase medium. The experiment device is characterized in that a water outlet in the lower part of a rain storage water tank with scales is connected with a water inlet of a water pump, and artificial simulated rainwater is conveyed to a spray head connected with theother end of a water guiding pipe through a water outlet of the water pump by virtue of the water guiding pipe; an experimental soil tank is placed at the bottom of an ammonia gas sampling bucket, anammonia gas sampling bracket is welded, four sampling holes are formed in the experimental soil tank, a water receiving tank with scales is placed on the right side of the experimental soil tank, andthe water guiding pipe on one side of the water receiving tank is connected with the water receiving tank; an ammonia gas sampling bottle is fixed on the ammonia gas sampling bracket, one end of an ammonia gas sampling pipe is