Title: Method of and system for underground irrigation

Abstract: At least one hollow water permeable member is embedded in soil to be irrigated. The water permeable member includes a wall having therein a plurality of fine capillary pores. A supply source of water is maintained at a negative water pressure. A feed pipe connects the supply source of water to the interior of the water permeable member. Water from the supply source passes through the feed pipe to the water permeable member and permeates through the capillary pores into the surrounding soil by means of a pressure difference between the negative water pressure of the supply source and the lower negative pressure within the soil surrounding the water permeable member resulting from the degree of absorptivity of the soil.

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Inventors: Saburi, Kunio (Nagaokakyo, JP)

Application Number: 950527
Filing Date: 1978-10-11
Publication_date: 1980-09-09
Assignee: World Seiko Kabushiki Kaisha (Nagaokakyo, JP)
Primary Class(es): 405/37 239/542, 405/36
Other Classes:
US Patent Ref:

2730404	Jan, 1956	Meisinger et al.	239/542.
3407608	Oct, 1968	Whitehead	405/37.
3420064	Jan, 1969	Blass et al.	239/542.
3546884	Dec, 1970	Timpe	405/37.
3566982	Mar, 1971	Share	405/36.
3603511	Sep, 1971	La Pierre	239/547.
3722539	Mar, 1973	Schmidt	239/145.
3819118	Jun, 1974	Brock et al.	239/542.
3887138	Jun, 1975	Gilead	239/542.
4037791	Jul, 1977	Mullett et al.	239/547.
4053109	Oct, 1977	Gilead	239/542.

Other Refs:
Primary Examiner: Taylor, Dennis L.
Assistant Examiner:
Attorney: Wenderoth, Lind & Ponack