The effect of different levels of acacia (Robinia pseudoacacia) biochar on growth, essential oil content and nutrient uptake of sage (Salvia officinalis L.) under cadmium stress

Document Type : Original Article

Authors

1 M.Sc Student, Department of Horticultural Sciences and Landscape Architecture, Faculty of Agriculture, Ferdowsi University of Mashhad, Mashhad, Iran

2 Professor: Department of Horticultural Sciences and Landscape Architecture, Faculty of Agriculture, Ferdowsi University of Mashhad, Mashhad, Iran

Abstract

Introduction
Plant growth is one of the most complex and environmentally sensitive physiological processes in plants. (Al-Khayri et al., 2023). Heavy metals are among the major limiting factors for crop cultivation in many regions worldwide, particularly in arid and semi‑arid areas such as Iran (Saini and Dhania, 2020). Cadmium (Cd) is a non-essential and highly toxic environmental pollutant that causes serious environmental and agricultural problems. High doses of cadmium are carcinogenic to humans. (Bakhtiari et al., 2023). Biochar is widely used as a soil conditioner because it improves soil physicochemical properties and nutrient availability (Muhammad et al., 2020). Salvia officinalis L., a perennial herbaceous species in the Lamiaceae family, is well known for its valuable essential oil. Accordingly, this study was conducted to evaluate the effects of biochar on selected growth traits, essential oil content, and nutrient uptake in Salvia officinalis L. under cadmium stress.
 
Materials and methods
The experiment was conducted as a factorial study in a completely randomized design with four replications in the research greenhouse of the Department of Horticultural Sciences and Landscape Architecture, Faculty of Agriculture, Ferdowsi University of Mashhad. The treatments consisted of three levels of biochar (0, 1, and 2% w/w) derived from acacia wood and three levels of cadmium stress (0, 30, and 60 mg kg⁻¹ soil). Plants were harvested at the flowering stage, and several traits were measured. The studied traits included growth characteristics, essential oil content, and nutrient elements including N, P, K, Ca, Mg, Fe, Mn, Cu, B, and Cd.
 
Results and discussion
The results indicated that increasing cadmium stress significantly decreased plant height, stem diameter, the number of sub-branches and leaves, fresh and dry weights of aerial parts, and root length and volume. Cadmium stress also significantly reduced essential oil content. The interaction between biochar application and cadmium levels showed that applying 2% w/w biochar increased plant height, leaf area, fresh and dry weights of aerial parts, and root length under different cadmium levels. The highest plant height (22 cm), leaf area (709.84 cm²), fresh (36.63 g per plant) and dry (20.44 g per plant) weights of aerial parts, root length (30.75 cm), and essential oil content (0.8% v/w) were observed in plants treated with 2% (w/w) biochar in the absence of cadmium. Essential oil content increased in response to biochar application. Essential oil content was approximately 12.33% higher in plants treated with 2% (w/w) biochar than in untreated plants. Biochar application improved growth traits and increased nutrient concentrations, with the maximum increases observed in plants treated with 2% (w/w) biochar.
 
Conclusion
Cadmium, as a toxic heavy metal, negatively affects plant growth. The results indicate that higher cadmium levels caused severe damage to plant growth, essential oil content, and nutrient uptake. The greatest cadmium‑induced damage was observed at a soil concentration of 60 mg kg⁻¹. Biochar application also improved growth traits, essential oil content, and nutrient uptake, with the greatest improvements observed in plants treated with 2% (w/w) biochar. The greatest improvements in morphological traits, essential oil content, and nutrient concentrations were observed in plants treated with 2% (w/w) biochar under severe cadmium stress. Biochar application reduced the harmful effects of cadmium by decreasing its translocation from roots to aerial parts and enhancing nutrient absorption.
 

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Main Subjects


 
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Articles in Press, Accepted Manuscript
Available Online from 13 May 2026
  • Receive Date: 27 February 2025
  • Revise Date: 21 April 2025
  • Accept Date: 23 April 2025