The researchers studied how adding spent mushroom compost affects the transformation of nutrients in compost made from plant litter. They compared two composting methods, one with spent mushroom compost added and one without. They found that adding spent mushroom compost increased the breakdown of organic matter, reduced nitrogen loss, increased potassium levels, and sped up the composting process. The compost with spent mushroom compost reached higher temperatures and matured faster than the compost without it. Overall, adding spent mushroom compost improved the quality and efficiency of the composting process.