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Background and Aims <p>Climate change intensifies water deficits in tropical regions, affecting sugarcane productivity. Silicon (Si) supplementation enhances tolerance to drought by improving the C:N:P balance and efficiency of nutrient conversion into plant biomass. The objective of this study was to evaluate the effect of Si doses on biomass production, nutrient use efficiency, and the C:N:P ratio in sugarcane under conditions of water restriction.</p> Methods <p>The experiment was conducted in a controlled environment for 150&#xa0;days, employing a randomized block design with a 4 × 2 factorial arrangement. The treatments comprised four Si doses: 0 (control), 78, 117, and 156&#xa0;kg&#xa0;ha<sup>−1</sup>, applied in the form of a fertilizer derived from amorphous silica (ASF), and two irrigation levels (50 and 20% of crop evapotranspiration – ETc).</p> Results <p>The Si dose of 78.0&#xa0;kg&#xa0;ha<sup>−1</sup> promoted the greatest osmotic adjustment, reaching 0.39&#xa0;MPa, which represents an increase of 12.0% compared to the control treatment. Cluster analysis showed that 78.0&#xa0;kg&#xa0;ha<sup>−1</sup> of Si associated with 50% of ETc reduced C concentrations, altered C:N:P ratios, improved C and N use efficiencies, and increased dry mass production in leaves and stalks.</p> Conclusion <p>The optimal Si dose of 78.0&#xa0;kg&#xa0;ha<sup>−1</sup>, equivalent to 300.0&#xa0;kg&#xa0;ha<sup>−1</sup> of ASF, promoted osmotic adjustment and modified the homeostatic balance of Si:C:N:P. This resulted in greater efficiency in the use of C and N, as well as greater accumulation of stalk dry matter in sugarcane plants subjected to water deficit.</p>

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Response of sugarcane under water deficit to amorphous silica doses: biomass, C:N:P homeostasis, and nutritional efficiency

  • 期刊论文

  • 发表日期：

    2025年10月31日

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  • Fabiano Simplicio Bezerra,
  • Renato de Mello Prado,
  • Gelza Carliane Marques Teixeira,
  • Deyvielen Maria Ramos Alves,
  • Steffany Daiana da Costa Berto,
  • Wellinton Julio Ferreira Gonçalves,
  • Lucas Yago de Carvalho Leal,
  • Martha Katharinne Silva Souza Paulino,
  • José Alfredo Nunes,
  • Cícero Aparecido Ferreira Araújo,
  • Ênio Farias de França e Silva,
  • Clístenes Williams Araújo do Nascimento,
  • Edivan Rodrigues de Souza

摘要

Background and Aims

Climate change intensifies water deficits in tropical regions, affecting sugarcane productivity. Silicon (Si) supplementation enhances tolerance to drought by improving the C:N:P balance and efficiency of nutrient conversion into plant biomass. The objective of this study was to evaluate the effect of Si doses on biomass production, nutrient use efficiency, and the C:N:P ratio in sugarcane under conditions of water restriction.

Methods

The experiment was conducted in a controlled environment for 150 days, employing a randomized block design with a 4 × 2 factorial arrangement. The treatments comprised four Si doses: 0 (control), 78, 117, and 156 kg ha−1, applied in the form of a fertilizer derived from amorphous silica (ASF), and two irrigation levels (50 and 20% of crop evapotranspiration – ETc).

Results

The Si dose of 78.0 kg ha−1 promoted the greatest osmotic adjustment, reaching 0.39 MPa, which represents an increase of 12.0% compared to the control treatment. Cluster analysis showed that 78.0 kg ha−1 of Si associated with 50% of ETc reduced C concentrations, altered C:N:P ratios, improved C and N use efficiencies, and increased dry mass production in leaves and stalks.

Conclusion

The optimal Si dose of 78.0 kg ha−1, equivalent to 300.0 kg ha−1 of ASF, promoted osmotic adjustment and modified the homeostatic balance of Si:C:N:P. This resulted in greater efficiency in the use of C and N, as well as greater accumulation of stalk dry matter in sugarcane plants subjected to water deficit.