What are the disadvantages of humus in the soil?

While humus is generally beneficial for soil health, it can have some disadvantages. High levels of humus can lead to excessive moisture retention, which may cause waterlogging and negatively impact root respiration. Additionally, an overabundance of organic matter can tie up nitrogen as it decomposes, potentially leading to nutrient deficiencies for plants. Lastly, in certain circumstances, a buildup of humus may attract pests or pathogens that thrive in enriched organic environments.