The researchers studied how using vermicompost and phosphate solubilizing bacteria affects the growth and yield of potatoes. They found that combining vermicompost with biofertilizers led to better growth and higher yields compared to using vermicompost alone. The best results were seen when applying Vermicompost @ 6 t/ha + PSB @ 10 kg/ha, which resulted in the highest number of tubers and overall yield per hectare.