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<p>This study investigated the effects of chicken manure biochar (CMBC), produced via co-pyrolysis of chicken manure and woody biomass (80:20 w/w) at 400℃, on the growth, nitrogen use efficiency, and nitrous oxide (N<sub>2</sub>O) emissions of kimchi cabbage (<i>Brassica rapa ssp. pekinensis</i>) in upland soil. The experiment compared a control group, inorganic fertilizer (IF), and three CMBC application rates (3, 5, and 7 t ha⁻¹, referred to as CMBC3, CMBC5, and CMBC7, respectively). Post-harvest soil analysis revealed that CMBC application increased soil pH, organic matter, available phosphate, and cation exchange capacity (CEC) compared with the control and IF treatments, with these effects showing a dose-dependent pattern. While the IF treatment yielded the highest fresh weight (1,453&#xa0;g plant<sup>− 1</sup>), CMBC7 showed significant growth improvement (1,244&#xa0;g plant<sup>− 1</sup>) and achieved the highest head height (23.2&#xa0;cm plant<sup>− 1</sup>). Notably, CMBC7 demonstrated superior nitrogen dynamics, reaching the highest agronomic efficiency (AE_N: 8.88&#xa0;kg N ha<sup>− 1</sup>) and apparent recovery fraction (ARF_N: 26.0%), both of which surpassed the IF treatment. Furthermore, CMBC application significantly mitigated N<sub>2</sub>O emissions by 59.2% to 72.1% compared to the IF treatment. These results suggest that applying CMBC at 7 t ha<sup>− 1</sup> is an effective strategy for enhancing soil fertility and nitrogen use efficiency while simultaneously reducing greenhouse gas emissions in intensive vegetable production systems.</p>

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Evaluation of agricultural potential of chicken manure biochar: growth and nitrogen use efficiency of kimchi cabbage and N2O emissions of upland soil

  • 期刊论文

  • 出版模式：

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  • 发表日期：

    2026年6月24日

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  • Ikhyeong Lee,
  • Han-Na Cho,
  • Chang-Gon Lee,
  • Ji-Min Song,
  • Se-Won Kang

摘要

This study investigated the effects of chicken manure biochar (CMBC), produced via co-pyrolysis of chicken manure and woody biomass (80:20 w/w) at 400℃, on the growth, nitrogen use efficiency, and nitrous oxide (N2O) emissions of kimchi cabbage (Brassica rapa ssp. pekinensis) in upland soil. The experiment compared a control group, inorganic fertilizer (IF), and three CMBC application rates (3, 5, and 7 t ha⁻¹, referred to as CMBC3, CMBC5, and CMBC7, respectively). Post-harvest soil analysis revealed that CMBC application increased soil pH, organic matter, available phosphate, and cation exchange capacity (CEC) compared with the control and IF treatments, with these effects showing a dose-dependent pattern. While the IF treatment yielded the highest fresh weight (1,453 g plant− 1), CMBC7 showed significant growth improvement (1,244 g plant− 1) and achieved the highest head height (23.2 cm plant− 1). Notably, CMBC7 demonstrated superior nitrogen dynamics, reaching the highest agronomic efficiency (AE_N: 8.88 kg N ha− 1) and apparent recovery fraction (ARF_N: 26.0%), both of which surpassed the IF treatment. Furthermore, CMBC application significantly mitigated N2O emissions by 59.2% to 72.1% compared to the IF treatment. These results suggest that applying CMBC at 7 t ha− 1 is an effective strategy for enhancing soil fertility and nitrogen use efficiency while simultaneously reducing greenhouse gas emissions in intensive vegetable production systems.