Impact Assessment of Precision Water Management on Nutrient Load from Paddy Field in Lake Inba-numa Watershed
Journal Title: Current Investigations in Agriculture and Current Research - Year 2019, Vol 6, Issue 3
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water treatment plantIrrigation water is essential for food production especially in paddy rice, and much water was withdrawn from water sources compare to other water use sector [1]. In Japan, water delivery system for agriculture was highly-developed and managed by land improvement district [2]. The 1st priority of irrigation is water supply to avoid the water stress, however, saving a labor input for agricultural land management such as weed control also the important factor. Therefore, farmers want to input much water for their paddy to save a labor cost [3]. However, much irrigation water leads much energy consumption for pumping, as a result, water fee also increases. In addition, increase of drainage water cause a much nutrient effluent to downstream water environment [4,5]. Historically, water delivery system in paddy agriculture has been supply-oriented system. However recent innovation of field monitoring or automatic regulation system will change it to demand-oriented system. In this study, the impact of precision water management by automatic irrigator was evaluated to improve the water management system in paddy without the additional labor input.
Authors and Affiliations
Koshi Yoshida, Issaku Azechi, Toshiaki Iida, Shigeya Maeda, Hisao Kuroda
Keywords
Related Articles
- EP ID EP597121
- DOI 10.32474/CIACR.2019.06.000239
- Views 92
- Downloads 0
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