I hope this information is helpful to everyone after reading a lot of the threads I see several people don't know about fertilizer and other things related to gardening.
I think most people probably buy their supplies from Lowe's, Home Depot, Wal Mart, etc. You will do better to buy your fertilizer and other supplies from your local farm supply store. The Ammonium Nitrate that Wal Mart sells is not the same as the Ammonim Nitrate you can buy at a farm supply store. Since the Oklahoma City bombing manufactures are now producing a none explosive form of Ammonium Nitrate sold at Wal Mart and other places this is not very good stuff compaired to what you can buy at farm supply stores.
Fertilizer is rated with 3 numbers like, 15/15/15, 6/12/12, 34/0/0, etc. The first number is nitrogen. The second number is Phosphate. The third number is Potash.
Nitrogen increases plant and fruit growth above the ground.
Phosphate inhances growth, color, strengthen the stems, increases blooms.
Potash increases growth below the ground like potatoes, carrots, onions, roots.
Lime reduces the acid of the soil and unlocks nutrience so it is available for the plants to use.
Sulfur increases the soil acidity good for crops like potatoes, Blue Berries.
Triple 15 fertilizer, 15/15/15 is a general purpose fertilizer.
Ammonium Nitrate, 34/0/0 is good for plant growth.
Urea is 46/0/0.
Murate of Potash, 0/0/60 is good for root crops and root growth.
Super Phosphate, 0/18/0 inhances color, strengthen stems, increases blooms.
6/12/12 good for potatoes, carrots, onions, garlic.
Pellet Lime prevents blossom end rot on tomatoes.
You can do Google search and find out detailes about what plants need in the way of fertilizer, soil, sun, water, geographical location, etc. I should remember this but I don't I took a class in college 40 years ago. I have forgotten more than I ever knew. I have to look this stuff up myself I am just to brain dead these days to remember anything without making notes.