Deficit Irrigation Effects on Rosemary Plant (Rosmarinus officinalis L.) Parameters in a Semi-arid Climate

Document Type : Original Article

Authors

Department of Water Resources Engineering, Faculty of Agricultural Science and Engineering, Razi University, Kermanshah, Iran

Abstract

Deficit Irrigation is one of the ways to use water resources efficiently. In this method, a part of the plant's water requirement is eliminated so that it does not have significant effects on its yield. In this study, between 2017 and 2018, the effects of deficit irrigation on rosemary plant was investigated. The research site was the research station of the Water Engineering Department of the Campus of Agriculture and Natural Resources of Razi University in Kermanshah, by using the available Lysimeter Two-factor factorial based on a completely randomized design with four treatments (100, 75, 50 and 25% of water requirement) and three replications were applied. The results showed that irrigation treatments of 75% and 50% of plant water requirement had the same performance in producing essential oil at the rate of 0.3 cm3/plant. However, the highest amount of essential oil production with a value of 0.4 cm3/plant was observed in full irrigation treatment. From the obtained results, it can be concluded that increasing the level of deficit irrigation significantly affected the Rosemary components such as root depth, essential oil, dry matter, and reduced all indicators (except the number of branches) compared to the control treatment. Finally, due to the reduction of all plant parameters, the amount of essential oil and dry matter yield due to increasing the level of water deficit, irrigation of rosemary with a deficit irrigation level of 50% does not seem reasonable and cannot be recommended. But at the 75% level, this reduction in performance can be considered acceptable and based on results in the case of rosemary cultivation to produce dry matter, irrigation at the rate of 75% of the plant requirement is sufficient, but in the case of rosemary cultivation to produce essential oil, the plant's water requirement should be fully met.

Graphical Abstract

Deficit Irrigation Effects on Rosemary Plant (Rosmarinus officinalis L.) Parameters in a Semi-arid Climate

Highlights

  • The study used 2 years of experimental data on Rosemary.
  • The effects of deficit irrigation on all plant parameters and rosemary were investigated.
  • It can be concluded that increasing the level of deficit irrigation significantly affected the Rosemary components.
  • Irrigation of Rosemary with a deficit irrigation level of 50% does not seem reasonable and cannot be recommended.

Keywords

Main Subjects

References

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Agrotechniques in Industrial Crops
Volume 2, Issue 2
Agrotechniques in Industrial Crops (Agrotech Ind Crops) (Online ISSN: 2783-2945)
June 2022
Pages 57-64

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