WATERING SYSTEM BY DIFFERENCE IN NEGATIVE PRESSURE

摘要

PURPOSE:To provide a compact and inexpensive watering system by difference in negative pressure, not damaging merits of a watering system by difference in negative pressure. CONSTITUTION:In a container 1 charged with a soil layer 2 at the upper part and a water storage part below the soil layer, a porous pipe is embedded in the soil layer. Water from the water storage part 3 is saturated under negative pressure in the porous pipe 4 and water in the porous pipe 4 is oozed through capillarity by difference between negative pressure of soil water in contact with the porus pipe and negative pressure in the porous pipe 4 to provide a watering system by the difference in negative pressure. Water in a flow channel intermittently flowing between the porous pipe and the water storage tank is forcibly made to flow and free air in the water channel can be removed to provide the objective watering system by difference in negative pressure provided with a free air removing means.