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Purpose <p>Soil salinization poses a major threat to global rice production by disrupting ion homeostasis and reducing yields. This study aimed to evaluate how the integration of straw and organic fertilizer improves rice salt tolerance through physiological and biochemical mechanisms.</p> Methods <p>A two-year pot experiment was conducted using two japonica cultivars under non-saline control (CK) and 0.2% salt treatment (ST). Three fertilization regimes were applied: chemical fertilizer alone (UN), urea with rape straw addition (US), and partial organic fertilizer substitution integrated with straw (OS).</p> Results <p>Salt stress led to excessive Na⁺ accumulation, disrupted K⁺/Na⁺ balance, and reduced yield. Both US and OS treatments improved yield components under salt stress, with OS exerting a stronger effect, particularly on seed-setting rate and grains per panicle. Compared with ST-UN, OS recovered 57.4% (NJ9108) and 63.1% (HJ5) of the yield loss. OS also enhanced root volume and dry matter accumulation during grain filling, increased fructose concentration and SOD activity, reduced spikelet degeneration, and improved leaf K⁺/Na⁺ balance.</p> Conclusions <p>Integrating straw with organic fertilizer enhances rice salt tolerance by improving ion homeostasis, osmotic regulation, and SOD activity. The stronger response in the salt-sensitive cultivar indicates the potential of this approach in compensating for low intrinsic salt tolerance. These findings support the use of integrated amendments as a sustainable strategy to stabilize rice yields in saline soils.</p>

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Combined Straw and Organic Fertilizer Application Improves Ion Homeostasis and Mitigates salt-induced Yield Loss in Rice

  • 期刊论文

  • 发表日期：

    2026年1月9日

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  • Fan Ye,
  • Zhou Zhou,
  • Jun Wang,
  • Shuai Li,
  • Yang Zhou,
  • Wen Teng,
  • Lijun Liu

摘要

Purpose

Soil salinization poses a major threat to global rice production by disrupting ion homeostasis and reducing yields. This study aimed to evaluate how the integration of straw and organic fertilizer improves rice salt tolerance through physiological and biochemical mechanisms.

Methods

A two-year pot experiment was conducted using two japonica cultivars under non-saline control (CK) and 0.2% salt treatment (ST). Three fertilization regimes were applied: chemical fertilizer alone (UN), urea with rape straw addition (US), and partial organic fertilizer substitution integrated with straw (OS).

Results

Salt stress led to excessive Na⁺ accumulation, disrupted K⁺/Na⁺ balance, and reduced yield. Both US and OS treatments improved yield components under salt stress, with OS exerting a stronger effect, particularly on seed-setting rate and grains per panicle. Compared with ST-UN, OS recovered 57.4% (NJ9108) and 63.1% (HJ5) of the yield loss. OS also enhanced root volume and dry matter accumulation during grain filling, increased fructose concentration and SOD activity, reduced spikelet degeneration, and improved leaf K⁺/Na⁺ balance.

Conclusions

Integrating straw with organic fertilizer enhances rice salt tolerance by improving ion homeostasis, osmotic regulation, and SOD activity. The stronger response in the salt-sensitive cultivar indicates the potential of this approach in compensating for low intrinsic salt tolerance. These findings support the use of integrated amendments as a sustainable strategy to stabilize rice yields in saline soils.