Eco-physiological analysis of nitrogen uptake of rice root under different combinations of inorganic nitrogen

2014 Fiscal Year Final Research Report

• Project/Area Number: 24780013
• Research Category: Grant-in-Aid for Young Scientists (B)
• Allocation Type: Multi-year Fund
• Research Field: Crop science/Weed science
• Research Institution: Ehime University
• Principal Investigator: ARAKI Takuya 愛媛大学, 農学部, 准教授 (10363326)
• Project Period (FY): 2012-04-01 – 2015-03-31
• Keywords: イネ / アンモニア態窒素 / 硝酸態窒素 / 乾物生産 / 窒素吸収

Outline of Final Research Achievements

Ammonium-nitrogen is considered main nitrogen nutrition for cultivated rice (Oryza sativa L.). However, with changeable irrigation by “alternate wet and drainage” in lowland, role of nitrate-nitrogen form in paddy rice attracted more attention. To obtain high yield, nitrogenous inorganic fertilizer has been applied increasingly, resulting in detrimental impacts on environment. Therefore, improving nitrogen use efficiency of rice with decreasing inorganic nitrogen application should be concerned. Total dry weight, nitrogen transport rate and root length were found the highest under the condition of 40% ammonium and 60% nitrate. These parameters of 100% nitrate showed higher value than those of 100% ammonium. Any ecotype, japonica, indica and tropical, grown under 100% nitrate showed better growth than that under 100% ammonium.

Free Research Field

作物学