Effects of elevated CO2 and O3 on soybean N2 fixation and total N in the surface soil.
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Values shown for N inputs to soil from N2 fixation exclude seeds.Values are mean ± s.e.m. *** (PP3, elevated O3.+CO2, elevated CO2.+CO2+O3, elevated CO2+O3. The main treatment effects of CO2, O3 and the CO2×O3 interaction on soil N were not statistically significant for any years.
创建时间：
2015-12-02
