How much nitrogen to apply on corn? That is a complex question and there are many approaches. In which case at 180 bu, I would need 60 gallons of 32% for corn on corn?' Or do I go back to units of N (per bushel). One - is this enough for 180 bu corn? Also is this 350/400 pounds of N as many articles (seem to) refer to or what is (the actual) pounds at this rate per acre. He wrote: 'I typically put on 35 to 40 gallons of 32% split applied. Even the way we track how many units of nitrogen are actually in a unit of fertilizer can be complicated, depending on whether the product used is a solid, liquid solution, or gas. I was reminded of how confusing that math can be in an email from a reader who stated that he reads many articles about nitrogen use on corn and finds the messaging quite confusing: Farmers (and agronomists) use different terms in different regions, and compute corn's nitrogen needs quite differently depending on state recommendations and other factors. That math can get more confusing this season as we put together the puzzle of buying the most cost-effective fertilizer, hitting yield goals while watching expenses, and taking into account the needs of modern hybrids and varieties. (DTN/The Progressive Farmer file photo by Jim Patrico)įertilizer math is fairly straightforward, but since most growers (and even agronomists) only calculate it once or twice a year (fall and spring), it is easy to forget the routine. Being able to calculate how much fertilizer to put on to apply the right amount of nitrogen is important.

Pounds to bushels conversion calculator