Why do plants grow better with fertilizer?

Plants grow better with fertilizer because it provides essential nutrients that may be lacking in the soil, such as nitrogen, phosphorus, and potassium. These nutrients are crucial for various physiological processes, including photosynthesis, root development, and overall plant health. Fertilizers also improve soil structure and microbial activity, enhancing the plant's ability to absorb water and nutrients. Consequently, this leads to increased growth, yield, and resilience against pests and diseases.