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
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- 1College of Agriculture, Ibaraki University, Japan
- 2National Agriculture and Food Research Organization, Japan
- 3Graduate School of Agricultural and Life Sciences, The University of Tokyo, Japan
*Corresponding author:
Koshi Yoshida, College of Agriculture, Ibaraki University, Japan
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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