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Background and objectives <p>Silicon (Si) has been widely reported to enhance tolerance to abiotic stresses, including drought, in several crops. However, the long-term effects of soil-applied Si remain insufficiently explored. This study aimed to assess dry matter production, plant nutritional status, C:N:P:Si stoichiometry, and soil Si availability in ratoon sugarcane under water deficit and the residual effect of an amorphous silica-derived fertilizer (ASF).</p> Methods <p>Ratoon sugarcane was grown under two levels, 40% or 80%, of maximum water retention capacity (MWRC) and four residual Si rates (0, 78, 117, and 156&#xa0;kg&#xa0;ha⁻<sup>1</sup>) applied in the previous cycle. Biomass production, leaf nutrient concentrations, uptake of Si and macronutrients (N, P, K, Ca, Mg, and C) and, C:N:P:Si stoichiometric ratios, and soil Si concentrations were determined.</p> Results <p>The 80% MWRC treatment combined with 156&#xa0;kg&#xa0;ha⁻<sup>1</sup> promoted increases of 34% in leaf and 78% in stalk dry matter relative to the 40% MWRC treatment. Leaf Si concentration rose from 2.47 to 6.64&#xa0;g&#xa0;kg⁻<sup>1</sup> between 0 and 156&#xa0;kg&#xa0;ha⁻<sup>1</sup>. At 40% MWRC, the 156&#xa0;kg&#xa0;ha⁻<sup>1</sup> Si rate increased leaf N and P concentrations by 27% and 84%, respectively, compared with the control. The lowest soil Si concentrations were observed in the soil 15–30&#xa0;cm layer, with mean values of 9.76 and 10.22&#xa0;mg&#xa0;dm⁻<sup>3</sup> under 40% and 80% MWRC, respectively.</p> Conclusion <p>Residual Si significantly improved biomass production and leaf nutritional status of ratoon sugarcane under water deficit. The nutrient extraction and export sequence for cultivar RB041443 was K &gt; N &gt; Si &gt; Ca &gt; P &gt; Mg.</p>

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Residual effect of silicate fertilization on ratoon sugarcane under water deficit conditions: plant biomass, nutrient element concentrations, and Si:C:N:P stoichiometric ratios

  • 期刊论文

  • 出版模式：

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  • 发表日期：

    2026年7月4日

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  • Steffany Daiana da Costa Berto,
  • Fabiano Simplicio Bezerra,
  • José Edson Florentino de Morais,
  • Lucas Yago de Carvalho Leal,
  • Martha Katharinne Silva Souza Paulino,
  • Cicero Aparecido Ferreira Araújo,
  • Bruce Schaffer,
  • Clístenes Williams Araújo do Nascimento,
  • Edivan Rodrigues de Souza

摘要

Background and objectives

Silicon (Si) has been widely reported to enhance tolerance to abiotic stresses, including drought, in several crops. However, the long-term effects of soil-applied Si remain insufficiently explored. This study aimed to assess dry matter production, plant nutritional status, C:N:P:Si stoichiometry, and soil Si availability in ratoon sugarcane under water deficit and the residual effect of an amorphous silica-derived fertilizer (ASF).

Methods

Ratoon sugarcane was grown under two levels, 40% or 80%, of maximum water retention capacity (MWRC) and four residual Si rates (0, 78, 117, and 156 kg ha⁻1) applied in the previous cycle. Biomass production, leaf nutrient concentrations, uptake of Si and macronutrients (N, P, K, Ca, Mg, and C) and, C:N:P:Si stoichiometric ratios, and soil Si concentrations were determined.

Results

The 80% MWRC treatment combined with 156 kg ha⁻1 promoted increases of 34% in leaf and 78% in stalk dry matter relative to the 40% MWRC treatment. Leaf Si concentration rose from 2.47 to 6.64 g kg⁻1 between 0 and 156 kg ha⁻1. At 40% MWRC, the 156 kg ha⁻1 Si rate increased leaf N and P concentrations by 27% and 84%, respectively, compared with the control. The lowest soil Si concentrations were observed in the soil 15–30 cm layer, with mean values of 9.76 and 10.22 mg dm⁻3 under 40% and 80% MWRC, respectively.

Conclusion

Residual Si significantly improved biomass production and leaf nutritional status of ratoon sugarcane under water deficit. The nutrient extraction and export sequence for cultivar RB041443 was K > N > Si > Ca > P > Mg.