A tidal seedbed is a cultivation bed with a plastic structure and a tide-sand seedling tray made of plastic. It is also called a bottom irrigation cultivation bed.This tidal irrigation mobile seedbed uses basically the same columns and supports as commercial metal structure cultivation beds, and the bed surface uses a molded impermeable plastic seedling tray.When irrigating, the seedling tray is filled with clean water or nutrient solution and allowed to stay for a certain period of time, so that the crops can absorb water through the drainage holes at the bottom of the flowerpot through capillary action.Irrigation water is then drained out of the cultivation bed, either collected and reused, or drained directly to local sewers.The tide-sand irrigation mobile seedbed is an advanced irrigation method with bottom water designed for potted plant nutrient solution cultivation or container seedling cultivation and soilless cultivation.This method uses the gap principle to achieve regular water supply and fertilization.A large number of experimental studies at home and abroad have shown that the growth of crops using tide sand irrigation method is significantly better than that of artificial irrigation method. It can not only reduce the occurrence of gangrenous leaves and wrinkled leaves, but also reduce water consumption by 33% and improve water utilization. Efficiency reaches 40%.Since tidal sand irrigation has no shower effect, it can also reduce nitrogen usage by 30% to 35%, greatly improving nitrogen utilization efficiency.