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Purpose <p>With predicted increase in the intervals between rainfall events becoming more apparent, little is known about how brief dry periods (few weeks) influence growth and nitrogen (N) uptake after rewetting in young plants, and how this legacy effect is modulated by drought intensity and soil amendment.</p> Methods <p>In a glasshouse experiment, soil unamended or amended with crop residue (C/N 9) was planted with wheat and kept at 50% water holding capacity (WHC; OPTIMAL) for two weeks. Thereafter, drought was imposed by reducing soil water content to 10% (DEFICIT) or 30% (MILD) WHC. After two weeks (day 0 to 14) of the dry period, both DEFICIT and MILD treatments were rewetted to 50% WHC and maintained for additional two weeks. Control soils were maintained at OPTIMAL throughout.</p> Results <p>At the end of the dry period, shoot dry weight (SDW) was about 60% lower in DEFICIT than OPTIMAL. Microbial biomass nitrogen (MBN) was about 80% lower in DEFICIT than OPTIMAL without amendment. Contrarily, soil available N was higher in DEFICIT (16.65–41.72&#xa0;mg kg<sup>− 1</sup>) than OPTIMAL (4.57–26.42&#xa0;mg kg<sup>− 1</sup>). During recovery in DEFICIT with amendment (days 15 to 28), SDW nearly doubled, shoot N concentration increased by about 40%, plant N uptake increased by about 70%, and MBN decreased by about 40%. However, SDW and plant N uptake were still lower than OPTIMAL.</p> Conclusion <p>The reduced plant growth, shoot N concentration and plant N uptake induced by the brief dry period (&lt; 30% WHC) was not compensated by increased growth and N uptake after rewetting during the short experimental period.</p>

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Legacy Effects of Drought on Soil Nitrogen and Plant Growth before and after Rainfall: A Glasshouse Study

  • 期刊论文

  • 发表日期：

    2025年9月5日

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  • Kehinde O. Erinle,
  • George O. Odugbenro,
  • Olanike O. Enitan

摘要

Purpose

With predicted increase in the intervals between rainfall events becoming more apparent, little is known about how brief dry periods (few weeks) influence growth and nitrogen (N) uptake after rewetting in young plants, and how this legacy effect is modulated by drought intensity and soil amendment.

Methods

In a glasshouse experiment, soil unamended or amended with crop residue (C/N 9) was planted with wheat and kept at 50% water holding capacity (WHC; OPTIMAL) for two weeks. Thereafter, drought was imposed by reducing soil water content to 10% (DEFICIT) or 30% (MILD) WHC. After two weeks (day 0 to 14) of the dry period, both DEFICIT and MILD treatments were rewetted to 50% WHC and maintained for additional two weeks. Control soils were maintained at OPTIMAL throughout.

Results

At the end of the dry period, shoot dry weight (SDW) was about 60% lower in DEFICIT than OPTIMAL. Microbial biomass nitrogen (MBN) was about 80% lower in DEFICIT than OPTIMAL without amendment. Contrarily, soil available N was higher in DEFICIT (16.65–41.72 mg kg− 1) than OPTIMAL (4.57–26.42 mg kg− 1). During recovery in DEFICIT with amendment (days 15 to 28), SDW nearly doubled, shoot N concentration increased by about 40%, plant N uptake increased by about 70%, and MBN decreased by about 40%. However, SDW and plant N uptake were still lower than OPTIMAL.

Conclusion

The reduced plant growth, shoot N concentration and plant N uptake induced by the brief dry period (< 30% WHC) was not compensated by increased growth and N uptake after rewetting during the short experimental period.