Inorganic fertilizers are available in various combinations of nitrogen, phosphorus, potash, and minor elements. They are good sources of plant foods and may be used alone or to supplement manures. A complete fertilizer, such as 10-5-5, contains 10 percent nitrogen, 5 percent phosphorus, and 5 percent potassium by weight. It may be spread evenly over the soil and spaded in, or it can be spread down a furrow about 3 inches from the seed row and covered over at planting time. Side dressing fertilizer (placement of fertilizer below the surface and near the seed or root zone) is ideal if you have the equipment. More than one application of fertilizer is recommended during the growing season for most vegetables.
Fertilizer, Mulch or Amendment has some suggestions for improving your soil.
When applying fertilizer, it is good to know the size of the area. Find Lot Size will show you the size of your lot so you can figure how much fertilizer you will need. When you go to the website, bypass the "Start Download" advertisement and just type in your address, then click on the map to set the markers.