To provide a compact and inexpensive watering system of negative pressure difference.
This watering system of negative pressure difference comprises a container 1 for housing a soil layer at the upper part and water storage parts under the soil layer. A porous pipe is embedded in the soil layer 2, water is saturated with water from water storage parts 3 and 3' and water is the porous pipe 4 is oozed through capillary into soil by difference between negative pressure of soil water in contact with the porous pipe 4 and negative pressure of the porous pipe 4. In this case, the water storage part consists of the first and the second water storage part 3 and 3', each of the water storage part is connected to one end of the porous pipe 4 by a conduit and can be changed so as to differ the water levels of the water storage parts 3 and 3' so that water in a channel communicating with the porous pipe 4 and the water storage parts 3 and 3' can be forcibly made to flow.
ENDO MASAHIRO
ISHIKAWA FUMIYA
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