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<p>Vermicompost application can improve soil physical structure and increase soil nitrogen (N) sequestration, yet its specific impact on soil aggregates in relation to changes in organic N fractions remains underexplored, especially in protected vegetable fields. We compared the effects of vermicompost substitution (commercial organic fertilizer, COF; reduced COF + vermicompost, RCOF + VC; vermicompost, VC) on soil dry aggregate size distribution, aggregate stability, particulate organic N (PON) and mineral-associated organic N (MON) distributions within aggregates, as well as their interrelationships in a protected continuous tomato cropping system. Compared with COF, RCOF + VC was not beneficial for soil macro-aggregation and aggregate stability in 20–40&#xa0;cm, leading to diminished physical protection and loss of organic N fractions. In comparison, VC had no significant influence on soil aggregate structure, while was effective in N retention by preventing organic N degradation, especially in 0–20&#xa0;cm. In all treatments, most PON and MON (averaging 86.05%) were distributed in macro-aggregates, which played more important role in regulating the quality of soil agglomeration structure than micro-aggregates. Although differing in quantity, PON and MON within macro-aggregates functioned equally in macro-aggregation, whereas for aggregate stability, MON played a more pivotal role. Vermicompost (30000&#xa0;kg hm<sup>− 2</sup>) can completely replace commercial organic fertilizer in terms of maintaining aggregate structure and occluded organic N fractions.</p>

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Soil aggregate and organic nitrogen distributions as influenced by vermicompost application in vegetable greenhouse

  • 期刊论文

  • 出版模式：

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  • 发表日期：

    2025年7月1日

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  • Feifei Pan,
  • Jiawen Zhang,
  • Jiao Tang,
  • Bihua Chen

摘要

Vermicompost application can improve soil physical structure and increase soil nitrogen (N) sequestration, yet its specific impact on soil aggregates in relation to changes in organic N fractions remains underexplored, especially in protected vegetable fields. We compared the effects of vermicompost substitution (commercial organic fertilizer, COF; reduced COF + vermicompost, RCOF + VC; vermicompost, VC) on soil dry aggregate size distribution, aggregate stability, particulate organic N (PON) and mineral-associated organic N (MON) distributions within aggregates, as well as their interrelationships in a protected continuous tomato cropping system. Compared with COF, RCOF + VC was not beneficial for soil macro-aggregation and aggregate stability in 20–40 cm, leading to diminished physical protection and loss of organic N fractions. In comparison, VC had no significant influence on soil aggregate structure, while was effective in N retention by preventing organic N degradation, especially in 0–20 cm. In all treatments, most PON and MON (averaging 86.05%) were distributed in macro-aggregates, which played more important role in regulating the quality of soil agglomeration structure than micro-aggregates. Although differing in quantity, PON and MON within macro-aggregates functioned equally in macro-aggregation, whereas for aggregate stability, MON played a more pivotal role. Vermicompost (30000 kg hm− 2) can completely replace commercial organic fertilizer in terms of maintaining aggregate structure and occluded organic N fractions.