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Open AccessTechnical Note
Water 2017, 9(8), 599;

Optimized Subsurface Irrigation System (OPSIS): Beyond Traditional Subsurface Irrigation

United Graduate School of Agricultural Sciences, Kagoshima University, 1-21-24 Korimoto, Kagoshima-shi, Kagoshima 890-0065, Japan
Faculty of Agriculture, Rajarata University of Sri Lanka, Puliyankulama, Anuradhapura 50000, Sri Lanka
Faculty of Agriculture, University of the Ryukyus, 1 Senbaru, Nishihara-cho, Okinawa 903-0213, Japan
Faculty of Agriculture, Kagoshima University, 1-21-24 Korimoto, Kagoshima-shi, Kagoshima 890-8580, Japan
Paddy Research Co., Ltd., 9 Haraoka, Minamikawa-machi, Tome-shi, Miyagi 987-0432, Japan
Midori Net Okinawa, 453-3 Motobu, Haebaru-cho, Okinawa 901-1112, Japan
Institute for Rural Engineering, National Agriculture and Food Research Organization, 3-1-1 Kannondai, Tsukuba-shi, Ibaraki 305-8517, Japan
Authors to whom correspondence should be addressed.
Received: 25 May 2017 / Revised: 14 July 2017 / Accepted: 17 July 2017 / Published: 12 August 2017
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Technologies that ensure the availability of water for crops need to be developed in order for agriculture to be sustainable in the face of climate change. Irrigation is costly, so technologies need to be improved or newly developed, not only with the aim of the sustainable use of precious water resources, but also with the aim of reducing associated labor and energy costs, which lead to higher production costs. OPSIS (optimized subsurface irrigation system) is a super water-saving subsurface irrigation system developed to irrigate upland crops by soil capillarity. It is an environmentally-friendly, solar-powered automatic irrigation method with minimum energy consumption and operational costs. In soils vulnerable to drought damage, OPSIS can outperform other irrigation methods. This technical note introduces OPSIS. View Full-Text
Keywords: automatic; environment friendly; upland crops; climate change; water saving automatic; environment friendly; upland crops; climate change; water saving

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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited (CC BY 4.0).

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Gunarathna, M.H.J.P.; Sakai, K.; Nakandakari, T.; Kazuro, M.; Onodera, T.; Kaneshiro, H.; Uehara, H.; Wakasugi, K. Optimized Subsurface Irrigation System (OPSIS): Beyond Traditional Subsurface Irrigation. Water 2017, 9, 599.

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