Document Type : Research Article
Authors
Department of Agrotechnology, Faculty of Agriculture, Ferdowsi University of Mashhad, Mashhad, Iran
Abstract
Introduction[1]
Medicinal plants play major roles in human health services worldwide. Many people in both developing and developed countries are turning to herbal medicine. Iran has a long medical tradition and a traditional learning of plant remedies. Besides serving medical and cultural functions, medicinal plants have also played an important economic role across the country. The planting area of medicinal plants is about 166,527 ha, which is nearly 1% of the total planting area in Iran. Marigold (Calendula officinalis) is a medicinal plant of the Asteraceae family. It is popular for the verdant color and an aromatic perfume which is provided by this plant. It grows in sun or partial gloominess and is effortless to grow, requiring little cultivation.Borage is from the Boraginaceae family and has the proper name of Borago officinalis. Borage is also known as the Bee plant and Bee Bread because the blue, purplish, star-shaped flower attracts bees all summer long. Throughout history, Borage has been used to treat a multitude of ailments and to improve overall health. The Romans would mix Borage tea and wine prior to combat, most likely to fortify themselves for the battle. The leaves are robust and have medicinal properties, and the topper of the plant is a striking blue star-shaped flower, hence the name. The flowers are edible as well and are often used for cake decorations or sweet syrups. Black cumin (Nigella sativa) belongs to the Ranunculaceae family. It has been used as a herbal medicine for more than 2000 years. It is also used as a food additive and flavor in many countries. Black cumin volatile oil has recently been found to contain 67 constituents, many of which have the potential to induce beneficial pharmacological effects in humans. Intercropping involves the integration of various elements of organism interactions in ecosystems and can be categorized as a pro-ecological approach to plant cultivation. This method aims to minimize harmful human interference in the environment, particularly the use of chemicals. Additionally, intercropping enables the attainment of high yields, superior quality, and enhanced economic productivity. The relationship between the intercropped components has garnered significant interest among researchers, particularly in terms of environmental resource management and its impact on productivity and economic indicators.
Therefore, the objective of the present study was to quantitatively determine the yield of black cumin (Nigella sativa L.), borage (Borago officinalis L.), and marigold (Calendula officinalis L.) in replacement intercropping.
Materials and Methods
An experiment was conducted based on a randomized complete block design with three replications at the Agricultural Research Station, Ferdowsi University of Mashhad, in the growth year of 2013-14. Treatments included 50:50 ratio of black cumin-marigold, black cumin-borage, and marigold-borage, and 33:33:33 ratio of black cumin-marigold-borage and monoculture of each of the three species. Economic and biological yield, harvest index, and yield components of three plants and LER were studied. For statistical analysis, analysis of variance (ANOVA) and least significant difference test (LSD), Minitab 16.0 was used.
Results and Discussion
The results showed that, except for HI, applied treatments have a significant effect on the number of branches per plant, number of folliclesper plant, number of seeds per follicles, the percentage of hollow follicles, grain weight, and partial LER of black cumin has been affected by intercropping. Treatments also affected the number of flowers per plant, biological yield, flower yield, and flower harvest index of marigold, and they also had a significant effect on the number of flowers per plant, number of sub-branches, biological and flower yield of borage, but HI was not affected by the treatments. The highest biological and economic yield of the three plants was observed in monoculture of the studied plants, but theirs partial LER increased in all of the intercropping treatments. It could mean the improvement in land use efficiency and other economic resources for more production of biomass of the plants. According to these results, the highest total LER based on biological and economical yield, 1.3 and 1.41, were gained in triple intercropping treatment, respectively. Therefore, it seems that triple intercropping of black cumin-marigold-borage in the ratio of 33:33:33 can be beneficial in terms of ecological management.
Conclusions
Intercropping is an effective strategy for optimal use of available environmental factors for plants and can be very useful, especially in times of land limitation. The results of this experiment clearly showed the synergistic effects of intercropping species on each other. According to the findings of this experiment, in general, intercropping of three medicinal plant species has been able to improve the growth conditions, increase the efficiency of these plants in using land and other available resources, and increase the production of these plants, while ensuring the sustainability of production in these plants. Therefore, according to the results of this study, it seems that in order to maximize the biological and economic performance of black seed, European borage, and perennial ryegrass, along with benefiting from the health of the produced product and sustainability in the production of these species, it is recommended to consider the triple intercropping of black seed, European borage, and perennial ryegrass.
Acknowledgements
We are grateful to the Honorable Vice Chancellor of Research and Technology of Ferdowsi University of Mashhad for providing the costs of this research.
Keywords
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