Trichoderma koningiopsis in promoting soybean growth and the action of volatile organic compounds on soil-dwelling...

Four Trichoderma koningiopsis (MS04, MS09, MS27, and MS28) isolated in dystrophic red oxisol were studied for their effect on promoting the growth of soybean plants. The ability of their volatile organic compounds (VOCs) to control the main soil plant pathogens that affect the crop was also evaluated. The VOC experiment was performed using sealed plate methodology, where a plate containing the agent was superimposed on a plate containing a mycelium disk of the plant pathogens Fusarium tucumaniae, Macrophomina phaseolina, Phomopsis longicolla, and Sclerotinia sclerotiorum. In the inoculation experiment on soybean seeds, a suspension of conidia from each T. koningiopsis isolate was used in the treatments conducted in pots. At stage V7, the shoot length, root length, stem diameter, root system volume, and green mass and dry mass of the shoot and root part were evaluated. In conclusion, all Trichoderma koningiopsis isolates effectively controlled the studied plant pathogens and significantly promoted soybean growth and biomass production.