Question

Why would adding a nitrogen-based fertilizer to soil help dying grass?

Answer 1

When nitrogen enters the body of a plant through its root system, internal plant processes rev up. ... During this time of strong shoot growth, root growth slows. This is something to keep in mind as you apply nitrogen fertilizer. When you add it to your grass, growth shifts from roots to shoots, giving you a lush lawn.

Answer 2

because nitrogen is essentially for life and growth and would provide nutrients in the dirt needed