What is fertilizer and why do plants need it?

plants

 

In order for a plant to grow and thrive, it needs a number of different chemical elements. To make plants grow faster, what you need to do is supply the elements that the plants need in readily available forms. That is the goal of fertilizer. Most fertilizers supply just nitrogen, phosphorus and potassium because the other chemicals are needed in much lower quantities and are generally available in most soils. Nitrogen, phosphorus and potassium availability is the big limit to growth.

Source: HowStuffWorks

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