| Budget Amount *help |
¥4,550,000 (Direct Cost: ¥3,500,000、Indirect Cost: ¥1,050,000)
Fiscal Year 2014: ¥1,300,000 (Direct Cost: ¥1,000,000、Indirect Cost: ¥300,000)
Fiscal Year 2013: ¥1,040,000 (Direct Cost: ¥800,000、Indirect Cost: ¥240,000)
Fiscal Year 2012: ¥2,210,000 (Direct Cost: ¥1,700,000、Indirect Cost: ¥510,000)
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| 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.
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