Underground irrigation with FOEAS in paddy field increased paddy water and roll temperature under cool climate condition in Hokkaido

2015 Fiscal Year Final Research Report

• Project/Area Number: 26660011
• Research Category: Grant-in-Aid for Challenging Exploratory Research
• Allocation Type: Multi-year Fund
• Research Field: Crop production science
• Research Institution: Hokkaido University
• Principal Investigator: IWAMA Kazuto 北海道大学, (連合)農学研究科(研究院), 特任教授 (70144219)
• Project Period (FY): 2014-04-01 – 2016-03-31
• Keywords: FOEAS / 水稲 / 乾田直播 / 冷害 / 水温 / 地温

Outline of Final Research Achievements

In Hokkaido, the most northern region in Japan with cool climate, an irrigation system from underground in lowland paddy fields (FOEAS) may have an advantage to reduce a cool-weather damage on rice，if FOEAS is able to increase water and soil temperatures in paddy fields. The rice cultivar ‘Nanatsuboshi’ was direct seeded at a FOEAS field (0.2 ha) and a transplanted at conventional field (0.1 ha) in Hokkaido University, Sapporo (42 degree North latitude), Japan. During the period from middle to end of July, generally the most risky period of cool-weather damage in rice, the water temperature was 1.1 degree C higher at the FOEAS field than at the conventional field. The soil temperature at 10 cm and 20 cm depths were also 0.4 and 0.7 degree C higher at the FOEAS field than at the conventional field, respectively. The present results suggest that FOEAS may contribute to reduce a cool-weather damage of rice by increasing water and soil temperatures at paddy fields in Hokkaido.

Free Research Field

作物学