Effects of biochar amendment on rhizosphere soil available nitrogen and crop growth.

Correlation analysis In rhizosphere soil, TN showed highly significant positive correlations with MBN, NH 4 + –N, NO 3 − –N, UE, and NR with correlation coefficients of 0.65, 0.81, 0.76, 0.82, and 0.87, respectively; and significant positive correlations with DON with a correlation coefficient of 0.53.

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However, the NH 4 + –N content showed a decreasing trend (Fig. 1 e).

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