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Effects of biochar (BC) application in rice (R) or wheat (W) seasons on contents of ammonium (NH4+-N, a), nitrate (NO3−-N, b), and total N (TN, c) in soil profile. The values are means ± SD (n = 3). Error bars represent the SD of the mean of three replicates. Different letters mean statistically significant differences at p < 0.05.
