Effect of sprinkled irrigation considering the irrigation amount, frequency, and time on prevention of occurrence of heat damage in rice

2016 Fiscal Year Final Research Report

• Project/Area Number: 26660195
• Research Category: Grant-in-Aid for Challenging Exploratory Research
• Allocation Type: Multi-year Fund
• Research Field: Rural environmental engineering/Planning
• Research Institution: National Agriculture and Food Research Organization
• Principal Investigator: SAKATA Satoshi 国立研究開発法人農業・食品産業技術総合研究機構, 中央農業研究センター 水田利用研究領域, 主任研究員 (00584327)
• Project Period (FY): 2014-04-01 – 2017-03-31
• Keywords: 気候変動 / 高温登熟 / 適応策 / 水管理 / 散水灌漑 / 外観品質 / 水稲 / 生育

Outline of Final Research Achievements

Countermeasures for the occurrence of heat damage in rice are becoming increasingly important with climate change. Although water management is one of the possible countermeasures, the irrigation techniques used to directly decrease the temperature of a rice grain have not been examined. This study verifies the effect of sprinkled irrigation considering the amount, frequency, and time for irrigation.

First, the irrigation time was set in the morning, daytime, and evening. The results showed that the temperature around the rice grain decreased the maximum in the evening. Second, three different volumes of irrigation were tested in the evening. The temperature in all the irrigated areas was lower than that of the control. However, the difference in the irrigation volume did not statistically affect the temperature decrease. Third, the irrigation frequency was set once, twice, and thrice a day. The results showed that the temperature decrease was the maximum in the irrigated once a day.

Free Research Field

灌漑排水学