Fig. 1. Soil and plant properties as influenced by nitrate and CO₂ levels in 6-weeks-old wheat.

Each bar represents the average of replicates with standard error (exact number of replicates can be found in Table S6). Different uppercase and lowercase letters indicate significant difference (P ≤ 0.05) by Student’s t test. Two-way ANOVA p values are provided in table on the right. NO-N₃ nitrate nitrogen.