Effects of biochar and amendments on the average amounts of NH<sub>4</sub><sup>+</sup> + NO<sub>3</sub><sup>-</sup>.Bars with different letters indicate significant differences among treatments at a 5% probability level.
<p>Effects of biochar and amendments on the average amounts of NH<sub>4</sub><sup>+</sup> + NO<sub>3</sub><sup>-</sup>.Bars with different letters indicate significant differences among treatments at a 5% probability level.</p