Interactive effects of elevated CO2 concentration and nitrogen form on dry matter production and nitrogen accumulation of some crop species

2014 Fiscal Year Final Research Report

• Project/Area Number: 24780018
• Research Category: Grant-in-Aid for Young Scientists (B)
• Allocation Type: Multi-year Fund
• Research Field: Crop science/Weed science
• Research Institution: National Agriculture and Food Research Organization
• Principal Investigator: KUMAGAI Etsushi 独立行政法人農業・食品産業技術総合研究機構, 東北農業研究センター生産環境研究領域, 研究員 (80583442)
• Project Period (FY): 2012-04-01 – 2015-03-31
• Keywords: 乾物生産 / 光合成 / 硝酸還元 / 窒素吸収 / 高CO2濃度 / 無機窒素形態

Outline of Final Research Achievements

Aiming to establish the adaptive nitrogen (N) management to future high CO2 environment, I investigated whether the responsiveness of biomass production and N concentration to CO2 enrichment varied among crop species differing in preference to nitrogen forms (nitrate vs ammonium). Rice plants (preference to ammonium) received ammonium nutrition showed the greater biomass enhancement to CO2 enrichment than ones received nitrate nutrition. In both pea and spinach (preference to nitrate), opposite results were obtained: Plants received nitrate nutrition showed the greater biomass enhancement. In spinach, the decline of N concentration due to elevated CO2 was observed in plants received nitrate, but not in plants received ammonium. This phenomenon resulted from the inhibition of nitrate assimilation in leaves rather than nitrate absorption in roots.

Free Research Field

作物学、農業気象学