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Background <p>Lagurus (<i>Lagurus ovatus</i> L.) is an important ornamental annual grass with fluffy flower heads that are in high demand in the dry flower industry. The stems of Lagurus are frequently used in floral arrangements and dried flower crafts. The utility of this flower in the dry flower industry cannot be underrated. Despite the huge demand for this flower, the economic returns obtained from its sale are comparatively low, which is mainly due to the production of short stems and smaller heads that fetch low prices in the market. Therefore, a field experiment was undertaken in factorial randomized complete block design (RCBD) with two factors and three replications. The key objectives of the experiment was to assess the influence of different seaweed extracts containing <i>Ascophyllum nodosum</i> (control, 2&#xa0;ml L<sup>−1</sup> and 4&#xa0;ml L<sup>−1</sup>) and GA<sub>3</sub> (control, 150&#xa0;ppm, 250&#xa0;ppm, 350&#xa0;ppm and 450&#xa0;ppm) on the growth and flowering of lagurus. The seaweed extract was applied both as a drench and foliar spray.</p> Results <p>A higher dose (4&#xa0;ml L<sup>−1</sup>) of seaweed extract performed superior in most of the vegetative and flowering traits including number of inflorescences per plant and flower head length. However, highest plant height and stem length was recorded in control plants without any seaweed extract. Among the tested GA<sub>3</sub> doses, the concentration of 450&#xa0;ppm produced maximum plant height, number of inflorescences per plant, flower head length and stem length. However, GA<sub>3</sub> application at 350&#xa0;ppm resulted in the highest root dry weight and root: shoot ratio, while maximum root fresh weight were found with GA<sub>3</sub> at 250&#xa0;ppm. An increase in GA<sub>3</sub> dose resulted in a linear increase in growth and flowering parameters.</p> Conclusion <p>The study demonstrated that a higher dose of seaweed extract (4&#xa0;ml L⁻<sup>1</sup>) significantly improved vegetative growth, flowering, and yield-related traits. Similarly, GA₃ application enhanced plant performance in a dose-dependent manner, with 450&#xa0;ppm GA₃ showing the best overall results for growth and flowering, while 350&#xa0;ppm optimized root dry weight and root-to-shoot ratio. Overall, the interaction of seaweed extract at 4&#xa0;ml L⁻<sup>1</sup> and GA₃ at 450&#xa0;ppm proved most effective for achieving superior plant growth and productivity in lagurus.</p>

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Growth and flowering response of Lagurus (Lagurus ovatus L.) to Ascophyllum nodosum extract based biostimulant and gibberellic acid (GA3) application

  • 期刊论文

  • 出版模式：

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  • 发表日期：

    2026年1月28日

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  • Ritika Manhas,
  • Arvinder Singh,
  • Nomita Laishram,
  • Shriya Gupta,
  • Kedar Mahadev Gheware,
  • Gurdev Chand,
  • B. K. Sinha,
  • Vikas Gupta

摘要

Background

Lagurus (Lagurus ovatus L.) is an important ornamental annual grass with fluffy flower heads that are in high demand in the dry flower industry. The stems of Lagurus are frequently used in floral arrangements and dried flower crafts. The utility of this flower in the dry flower industry cannot be underrated. Despite the huge demand for this flower, the economic returns obtained from its sale are comparatively low, which is mainly due to the production of short stems and smaller heads that fetch low prices in the market. Therefore, a field experiment was undertaken in factorial randomized complete block design (RCBD) with two factors and three replications. The key objectives of the experiment was to assess the influence of different seaweed extracts containing Ascophyllum nodosum (control, 2 ml L−1 and 4 ml L−1) and GA3 (control, 150 ppm, 250 ppm, 350 ppm and 450 ppm) on the growth and flowering of lagurus. The seaweed extract was applied both as a drench and foliar spray.

Results

A higher dose (4 ml L−1) of seaweed extract performed superior in most of the vegetative and flowering traits including number of inflorescences per plant and flower head length. However, highest plant height and stem length was recorded in control plants without any seaweed extract. Among the tested GA3 doses, the concentration of 450 ppm produced maximum plant height, number of inflorescences per plant, flower head length and stem length. However, GA3 application at 350 ppm resulted in the highest root dry weight and root: shoot ratio, while maximum root fresh weight were found with GA3 at 250 ppm. An increase in GA3 dose resulted in a linear increase in growth and flowering parameters.

Conclusion

The study demonstrated that a higher dose of seaweed extract (4 ml L⁻1) significantly improved vegetative growth, flowering, and yield-related traits. Similarly, GA₃ application enhanced plant performance in a dose-dependent manner, with 450 ppm GA₃ showing the best overall results for growth and flowering, while 350 ppm optimized root dry weight and root-to-shoot ratio. Overall, the interaction of seaweed extract at 4 ml L⁻1 and GA₃ at 450 ppm proved most effective for achieving superior plant growth and productivity in lagurus.