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Background and aims <p>It is critical to better understand the effect of compost on plant growth and nutrient uptake under drought of varying durations and intensities in sandy soils. This study aimed to determine the effects of compost on plant growth, nitrogen (N) and phosphorus (P) uptake, N and P availability and microbial biomass N (MBN) and P (MBP) under droughts differing in length and intensity, and after rewetting in a sandy soil.</p> Methods <p>Two experiments differing in water regimes and harvest time consisted of two amendments (unamended Control and Compost), three water regimes [well-watered—60% water holding capacity (WHC), moderate drought—40% WHC, and severe drought—20% WHC], and three drought durations (7, 14, and 21 days). Plants were harvested after drought and two weeks after re-watering.</p> Results <p>At the end of the drought, Compost did not increase shoot and root dry weight, shoot N and P uptake, photosynthetic rate, and microbial biomass N compared to the Control. This limited response was likely due to increased soil electrical conductivity and restricted root development under drought. However, after rewetting, compost significantly altered nutrient availability and microbial responses: available N was fourfold higher following 14-day severe drought; MBN was up to sevenfold higher after 7-day severe and 14-day moderate droughts; and MBP was up to 11-fold higher after 14- and 21-day severe droughts.</p> Conclusion <p>Compost increased microbial N and P uptake two weeks after rewetting following severe and/or moderate droughts, indicating novel post-drought legacy effects that may facilitate subsequent plant growth and nutrient uptake.</p>

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Compost addition promotes microbial nitrogen and phosphorus uptake after rewetting following drought, but not plant growth

  • 期刊论文

  • 出版模式：

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  • 发表日期：

    2026年5月28日

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  • Thi Hoang Ha Truong,
  • Petra Marschner,
  • Zhe H. Weng

摘要

Background and aims

It is critical to better understand the effect of compost on plant growth and nutrient uptake under drought of varying durations and intensities in sandy soils. This study aimed to determine the effects of compost on plant growth, nitrogen (N) and phosphorus (P) uptake, N and P availability and microbial biomass N (MBN) and P (MBP) under droughts differing in length and intensity, and after rewetting in a sandy soil.

Methods

Two experiments differing in water regimes and harvest time consisted of two amendments (unamended Control and Compost), three water regimes [well-watered—60% water holding capacity (WHC), moderate drought—40% WHC, and severe drought—20% WHC], and three drought durations (7, 14, and 21 days). Plants were harvested after drought and two weeks after re-watering.

Results

At the end of the drought, Compost did not increase shoot and root dry weight, shoot N and P uptake, photosynthetic rate, and microbial biomass N compared to the Control. This limited response was likely due to increased soil electrical conductivity and restricted root development under drought. However, after rewetting, compost significantly altered nutrient availability and microbial responses: available N was fourfold higher following 14-day severe drought; MBN was up to sevenfold higher after 7-day severe and 14-day moderate droughts; and MBP was up to 11-fold higher after 14- and 21-day severe droughts.

Conclusion

Compost increased microbial N and P uptake two weeks after rewetting following severe and/or moderate droughts, indicating novel post-drought legacy effects that may facilitate subsequent plant growth and nutrient uptake.