Impact Assessment of Precision Water Management on Nutrient Load from Paddy Field in Lake Inba-numa Watershed

Volume 6 - Issue 2

Koshi Yoshida¹*, Issaku Azechi², Toshiaki Iida³, Shigeya Maeda¹ and Hisao Kuroda¹

Received: February 27, 2019;   Published:March 12, 2019

DOI: 10.32474/CIACR.2019.06.000239

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Abstract

In this study, the impact of nutrient load reduction by precision water management was evaluated to improve the water environment of Lake Inbanuma. Kashima district, which was managed by Inbanuma land improvement district, was selected for the test site. Paddy water level, nitrogen and phosphorus concentration were monitored at Iino pumping station and paddy drainage during 2012-2014. From the monitoring data, water balance and nutrients balance were estimated. As a result, average nitrogen load from paddy was 36kgN/ha/season and phosphorus load were 7kgP/ha/season. Precision water management by automatic irrigator can reduce 65% of irrigation water, 58% of nitrogen load and 43% of phosphorus load. Finally, installation cost of automatic irrigator in Kashima district was estimated and compare to construction cost of waste water treatment plant.

Keywords: Water environmental conservation; Automatic irrigator; Cost-benefit

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