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Potassium Silicate Positively Affects Oil Content, Physiologic, and Agronomic Traits of Camelina sativa L. Under Optimal Water Supply and Drought Stress Conditions

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Abstract

A factorial experiment was arranged in a randomized complete blocks design with three replicates in 2018–19 and 2019–20 growing seasons in Karaj, Iran to investigate the effects of foliar application of different potassium silicate concentrations (0, 1, 2, 3 g L−1) on camelina plants under different irrigation regimes (optimal water supply, withholding irrigation from formation of silicles, and withholding irrigation from flowering). The results indicated that both restricted irrigation regimes negatively affected the physiologic (relative water content, stomatal resistance, canopy temperature, and total chlorophyll content) and agronomic (number of silicle per plant, number of seed per silicle, 1000-seed weight, seed yield, and water use efficiency) traits as well as oil content, while the potassium silicate alleviated the adverse effects of drought stress on studied traits. The highest camelina seed yield (2521 kg ha−1), water use efficiency (0.492 kg ha−1 m−3), and oil content (33.53%) belonged to foliar application of 2 g L−1 under optimal water supply regime. On average across potassium silicate treatments, reductions of 45 and 64%, 27 and 28%, and 6 and 11% were detected for seed yield, water use efficiency, and oil content when irrigation was restricted from silicle formation and flowering stages compared with the optimal water supply regime, respectively. Overall, the foliar application of 2 g potassium silicate L−1 under an optimal water supply regime and 3 g potassium silicate L−1 under drought stress conditions can be recommended to achieve the best performance of camelina.

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Acknowledgements

The authors gratefully acknowledge the support provided for this survey by the Seed and Plant Improvement Institute (SPII), Karaj, Iran.

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This research did not receive any specific grant from funding agencies in the public, commercial, or not-for-profit sectors.

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Authors and Affiliations

  1. Seed and Plant Improvement Institute (SPII), Agricultural Research, Education and Extension Organization (AREEO), Karaj, Iran

    Amir Hosein Shirani Rad

  2. Department of Agronomy, Faculty of Agriculture, Tarbiat Modares University, PO Box 14115-336, Tehran, Iran

    Mohammad Malmir

  3. Department of Agricultural Sciences, Technical and Vocational University (TVU), Tehran, Iran

    Hamed Eyni-Nargeseh

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Contributions

Amir Hosein Shirani Rad: Conceptualization, Methodology, Project administration, Writing- Original draft preparation, Mohammad Malmir: Software, Formal analysis, Writing- Original draft preparation, Hamed Eyni-Nargeseh: Software, Formal analysis, Writing- Original draft preparation.

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Correspondence to Amir Hosein Shirani Rad or Hamed Eyni-Nargeseh.

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Rad, A.H.S., Malmir, M. & Eyni-Nargeseh, H. Potassium Silicate Positively Affects Oil Content, Physiologic, and Agronomic Traits of Camelina sativa L. Under Optimal Water Supply and Drought Stress Conditions. Silicon 16, 1071–1082 (2024). https://doi.org/10.1007/s12633-023-02741-8

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