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Purpose <p>Crop adaptability to water scarcity is one of the major challenges associated with climate change, especially under arid and semi-arid zones. Therefore, it is necessary to adopt some agricultural practices that decrease harmful effects of drought stress and ensure sustainability of field crops in these zones.</p> Methods <p>This study aimed to investigate the potential role of cobalt (Co) in reducing yield losses of barley under water deficit conditions. Thus, two-year field trial was carried out to study the effect of three Co levels (Co<sub>0.0</sub>, Co<sub>7.5</sub>, Co<sub>10</sub>, i.e. zero, 7.5, 10 mg&#xa0;Co&#xa0;L<sup>−1</sup>) and three irrigation regimes (100, 75, 50% of crop water requirement, WR<sub>100%</sub>, WR<sub>75%</sub>, WR<sub>50%</sub>) on leaf greenness, nutrients content, dry matter accumulation and water use efficiency of barley plants. Treatments were placed in a&#xa0;strip–plot design with three replicates.</p> Results <p>Findings showed that yield losses due to moderate (WR<sub>75</sub>), and severe (WR<sub>50</sub>) deficit irrigation were reduced via Co supply. In this respect, the increases in grain yield due to Co<sub>7.5</sub> and Co<sub>10</sub> applications were 1.08 and 1.28 times under WR<sub>75</sub> as well as 1.10 and 1.29 times under WR<sub>100%</sub>, respectively, compared to untreated plants. Under different irrigation regimes, Co<sub>10</sub> recorded the highest irrigation water use efficiency (IWUE) value surpassing Co<sub>0.0</sub> and Co<sub>7.5</sub>. Under severe water deficiency, Co at high concentration improved accumulation of macronutrients. The regression equation showed that for constant water amount, the barley grain yield increases with increasing Co rate.</p> Conclusion <p>In conclusion, involving Co under low water supply of barley plants became decisive action to preserve water and alleviate yield losses resulting from drought stress.</p>

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Ameliorative Influence of Cobalt on Agronomic Attributes, Nutrients Accumulation and Irrigation Water Use Efficiency of Drought-Stressed Barley

  • 期刊论文

  • 发表日期：

    2026年4月21日

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  • Khaled M. A. Ramadan,
  • Sallah A. Al-Hashedi,
  • Hisham A. Mohamed,
  • Hossam S. El-Beltagi,
  • Ibrahim M. El-Metwally,
  • Hani S. Saudy,
  • Eslam S. A. Bendary,
  • Mostafa G. Shahin

摘要

Purpose

Crop adaptability to water scarcity is one of the major challenges associated with climate change, especially under arid and semi-arid zones. Therefore, it is necessary to adopt some agricultural practices that decrease harmful effects of drought stress and ensure sustainability of field crops in these zones.

Methods

This study aimed to investigate the potential role of cobalt (Co) in reducing yield losses of barley under water deficit conditions. Thus, two-year field trial was carried out to study the effect of three Co levels (Co0.0, Co7.5, Co10, i.e. zero, 7.5, 10 mg Co L−1) and three irrigation regimes (100, 75, 50% of crop water requirement, WR100%, WR75%, WR50%) on leaf greenness, nutrients content, dry matter accumulation and water use efficiency of barley plants. Treatments were placed in a strip–plot design with three replicates.

Results

Findings showed that yield losses due to moderate (WR75), and severe (WR50) deficit irrigation were reduced via Co supply. In this respect, the increases in grain yield due to Co7.5 and Co10 applications were 1.08 and 1.28 times under WR75 as well as 1.10 and 1.29 times under WR100%, respectively, compared to untreated plants. Under different irrigation regimes, Co10 recorded the highest irrigation water use efficiency (IWUE) value surpassing Co0.0 and Co7.5. Under severe water deficiency, Co at high concentration improved accumulation of macronutrients. The regression equation showed that for constant water amount, the barley grain yield increases with increasing Co rate.

Conclusion

In conclusion, involving Co under low water supply of barley plants became decisive action to preserve water and alleviate yield losses resulting from drought stress.