Special Issue for the 13th IWA International Specialist Conference

Water-saving irrigation of paddy field to reduce nutrient runoff

Tadayoshi Hitomi , Yusaku Iwamoto , Asa Miura , Koji Hamada , Kyoji Takaki , Eisaku Shiratani


Received October 14, 2009,Revised January 04, 2010, Accepted , Available online

Volume 22,2010,Pages 885-891

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The purpose of this work is to study the effect of a type of water-saving irrigation (WSI) on nutrient runo of paddy field. The volume of surface drainage was maintained low by WSI. In particular, WSI e ectively reduced surface drainage in rain events. Model simulation indicated that net runo load of total nitrogen (TN) from the paddy field was increased by WSI. Meanwhile, net runo loads of total phosphorus (TP) and total organic carbon (TOC) from the paddy field was decreased by WSI. Because ponding waters of the study fields were enriched with TP and TOC, WSI reduced runo of these nutrients by controlling the volume of surface drainage. WSI could be considered an e cient method for reducing runo loads and could conserve water quality in an agricultural watershed.

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