Roselle (Hibiscus sabdariffa) is one of the most significant medical plants as it carries certain health benefits. This plant is used to treat many diseases including cathartic, restorative, cancer, protective, sexual stimulator, appetizer, refrigerant as well as anti-cough1.
Pests are the old enemies of plants and are known to decrease the quality and yield of plants. Among these pests, nematodes are potent pathogens that cause huge loss in agricultural sector. It is reported that the yearly global loss in agriculture because of damage by plant-parasitic nematodes is approximately US $100 billion all over the world. The majority of these plant-parasitic nematodes attack the roots or other parts in the soil including bulbs and tubers that ultimately hinders the uptake of water as well as nutrients by plants2.
Accordingly, numerous well-known fertilizers incorporate nitrogen in their composition or made specifically as a nitrogen fertilizer is essential and vital for plant growth. It is reported that utilization of ammonia (NH3) has the capability to control parasitic nematodes, with exposure of J2 to ammonia at 9.3 mg plant–1 for 40 h causing 95% mortality3.
However, the application of various strains of bio fertilizers is crucial as they can assist to lessen the use of chemical nitrogen fertilizers and improve the plant growth to reduce the production cost and environmental risk4.
Accordingly, these facts motivated scientists for conducting a new research in order to maximize the application of bio fertilizer and urea to manage and control the plant-parasitic nematode infected rosella for enhancing growth and active constituents as well5.
For accomplishment of this target, research team conducted field experiments to discover the role of three bio fertilizers: Azotobacter chroococcum; Bacillus polymyxa and Pseudomonas fluorescens with or without the use of different doses of urea (0, 30, 60, 90 and 120 kg/feddan) in order to control plant-parasitic nematodes that infect roselle plants with regard to its growth characters under field conditions during two successive seasons5.
During this experiment, scientists found that all tested treatments considerably decreased soil and root population of the plant parasitic nematodes at 5% and also amplified the growth, yield and chemical constituents of roselle plants as compared to untreated control.
Conclusively, the most excellent and optimum combined treatments among bio-fertilizers and urea levels occurred by application of A. chroococcum as well as 60 kg urea/feddan as this combination exhibited the maximum plant parasitic nematodes reduction %ages and as a result flourished all vegetative growth characteristics, such as yield parameters and chemical composition of roselle plants.
Key words: roselle, medical plants, plant-parasitic nematodes, bio fertilizers, nitrogen fertilizers, yield parameters, urea
Your email address will not be published. Required fields are marked *