excessive use of fertilizers made the soil less fertile why

Applying more fertilizer than is recommended or needed by the crop costs money not only in unnecessary product being applied but also in reduced fruit and vegetable quality.

For example:

• excessive soil nitrogen leads to greater imbalances in essential amino acids
• too much nitrogen and phosphorus reduces ascorbic acid
• without any positive effect on yield, excessive potassium lowers potato tuber specific gravity, strawberry fruit size, and fruit wall thickness of peppers.