why is it important for soil to contain nitrogen, phosphorus and potassium? Why is it important to fix soil that is lacking in these nutrients?

the best answer that I could give you is that without those things the plant would die.

Explanation: the soil is important because it helps the plant with growing and it hold the roots and the water and other things like that, also without nutrients the plant couldn't survive the nutrients is basically food for the plants

Nitrogen is used by plants for lots of leaf growth and good green color. Phosphorous is used by plants to help form new roots, make seeds, fruit and flowers. Potassium helps plants make strong stems and keep growing fast. It's also used to help fight disease.

the answer to your question is sperm