We use liquid fertilizer on our farm, but there are other options like anhydrous ammonia and dry fertilizer. This is a picture of the rig we use. It cover 14 rows, 36" apart or 42 feet. We can travel around 10 mph, so it doesn't take long to finish a field. The yellow tank holds 1500 gallons of fertilizer.
Every field gets a different amount of fertilizer. We base the amount we apply on soil tests. This year we are applying anywhere from 15 to 45 gallons of 32% nitrogen per acre now. We are also adding 5 gallons per acre of thiosulfate. This mix equals 60-170 pounds of nitrogen per acre.
Looking down the rows. This corn was planted on May 6, 2013. The previous crop was also corn. We use a three-year rotation. Two years of corn and one year of soybeans. This field has been cultivated once and will be cultivated again soon to form the ridges we gravity irrigate with.
On fields that are irrigated with a pivot or underground drip we do not need to cultivate and we practice no-till on them.