1. Leeching happens; Inorganic fertilizers contain nutrients that have been broken down already into the most basic of its components for easy absorption by the plants. Yet, it can also be washed away easily when watering or irrigating the plants. This is called leeching.
2. Some are not affordable; Generally, inorganic fertilizers are inexpensive. Yet, some specially formulated inorganic fertilizers come at a cost that are considerably higher than most.
3. Accumulation of toxic wastes; Inorganic fertilizers are not entirely composed of the nutrients needed by the plants. It also contains salts and other compounds. These are not absorbed by the plants so they are left behind in the soil and build up over time.
When found in large amounts in the soils, these compounds can alter the chemistry of the soil that makes it less ideal for planting. Often times, the soil needs to be neutralized using other substances to return it to a normal state that is suitable for planting.
4. Too much is not a good thing
Fertilizers are good sources of nutrients for plants. However, too much of it can also be harmful to the plants. Applying the fertilizer directly to the plants may burn the delicate plant structures such as the roots. This could affect the over-all development of the plant.