Fertilizers are very important to the world economy, mostly because without them, it would be harder to grow agriculture. As stated by Howstuffworks.com;
"In order for a plant to grow and thrive, it needs a number of different chemical elements. The most important are:
-Carbon, hydrogen and oxygen - Available from air and water and therefore in plentiful supply
-Nitrogen, phosphorus, potassium (a.k.a. potash) - The three macronutrients and the three elements you find in most packaged fertilizers
-Sulfur, calcium, and magnesium - Secondary nutrients
-Boron, cobalt, copper, iron, manganese, molybdenum and zinc - Micronutrients"
It's basically saying that plants need a lot of different chemicals to grow well, and fertilizers are just that perfect blend of those chemicals. It's like Colonel Sander's 11 herbs and spices, it's the perfect combonation of these different things that make something better.
http://science.howstuffworks.com/question181.htm
http://www.bhg.com/bhg/category.jsp?catref=C401
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