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<p>Acidity (pH &lt; 5.5) in tropical soils poses challenges to plant growth, traditionally mitigated by agricultural lime (CaCO<sub>3</sub>). This study explores nano-lime (NL) as a potential solution to reduce lime usage while effectively addressing soil acidity.&#xa0;A pot experiment was conducted to test four NL doses—10, 20, 30, and 50&#xa0;kg NL ha<sup>− 1</sup> in a liquid form—against a control, with soil incubation for 21 days followed by 50 days of spinach growth.&#xa0;NL exhibits an extend liming effect for ~ 70 days with optimal application rates of 30 and 50&#xa0;kg ha⁻¹. The 50&#xa0;kg ha⁻¹ dose increased soil pH to 6.15, reduced potential acidity by 79%, rectified aluminum (Al) toxicity by improving the ratio of exchangeable calcium (Ca<sub>ex</sub>) to exchangeable aluminum (Al<sub>ex</sub>)— Ca<sub>ex</sub>/Al<sub>ex</sub> ratio to ≥ 12:1, and significantly enhancing spinach growth indicators of leaf area index (11-times) and both of root hair area index and root length (4-times) the control. This resulted in a dry matter yield (DMY) of 3.6&#xa0;g plant<sup>− 1</sup>. Despite the high cost of NL, the 30&#xa0;kg ha⁻¹ dose proved cost-effective, raising soil pH to 5.92, reduced potential acidity by 76%, delivering satisfactory DMY (2.04&#xa0;g plant<sup>− 1</sup>) and rectified Al-toxicity by improving Ca<sub>ex</sub>/Al<sub>ex</sub> ratio to ≥ 6:1.&#xa0;These outcomes highlight NL potential as an economic and promising solution to optimize lime usage for managing soil acidity by employing smaller quantities in liquid formulations. Nevertheless, additional research is crucial to assessing the scalability and effectiveness of liquid NL through field studies across various acidic soil types.</p>

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Liquid Nano-Lime Mitigates Acidity and Enhances Spinach Growth in Acid Soil

  • 期刊论文

  • 发表日期：

    2025年11月28日

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  • Abd El-Halim A Abd El-Halim,
  • Hide Omae

摘要

Acidity (pH < 5.5) in tropical soils poses challenges to plant growth, traditionally mitigated by agricultural lime (CaCO3). This study explores nano-lime (NL) as a potential solution to reduce lime usage while effectively addressing soil acidity. A pot experiment was conducted to test four NL doses—10, 20, 30, and 50 kg NL ha− 1 in a liquid form—against a control, with soil incubation for 21 days followed by 50 days of spinach growth. NL exhibits an extend liming effect for ~ 70 days with optimal application rates of 30 and 50 kg ha⁻¹. The 50 kg ha⁻¹ dose increased soil pH to 6.15, reduced potential acidity by 79%, rectified aluminum (Al) toxicity by improving the ratio of exchangeable calcium (Caex) to exchangeable aluminum (Alex)— Caex/Alex ratio to ≥ 12:1, and significantly enhancing spinach growth indicators of leaf area index (11-times) and both of root hair area index and root length (4-times) the control. This resulted in a dry matter yield (DMY) of 3.6 g plant− 1. Despite the high cost of NL, the 30 kg ha⁻¹ dose proved cost-effective, raising soil pH to 5.92, reduced potential acidity by 76%, delivering satisfactory DMY (2.04 g plant− 1) and rectified Al-toxicity by improving Caex/Alex ratio to ≥ 6:1. These outcomes highlight NL potential as an economic and promising solution to optimize lime usage for managing soil acidity by employing smaller quantities in liquid formulations. Nevertheless, additional research is crucial to assessing the scalability and effectiveness of liquid NL through field studies across various acidic soil types.