Fertilizer cost

Asked August 14, 2013, 6:00 PM EDT

I would like to know the current value of one ton or pound of Phosphorus, as applied fertilizer, in ag flelds, in Southeast South Dakota. I can only get prices of the 18-46-0 of about $525-$595.
How do i accurately convert that to cost of P?
Thank You,

Minnehaha County South Dakota

1 Response

You will be the expert on the local cost of various blends of fertilizers in SE South Dakota. You can get quotes from your dealers on the basic fertilizers: urea, UAN liquid, ammonium nitrate, ammonium sulfate. These are the primary N sources. You can get the price of a ton, multiple the percentage N times 2000 and divide into the price to get a pound price for N. Then assign the pound price for N on the N source you would use; lets say you find N for urea is being sold for 40 cents per pound. Thus on 100 pounds of 18-46-0, you have 0.18X2000 lbs=360. Thus you have 360 pounds of N in a ton of 18-46-0 time $0.40, or $144 worth of N in the $525 per ton 18-46-0. Now you can multiply 0.46 X 2000= 920 pounds of phosphate. If you subtract $144 from $525, you get $381 per 920 pounds of phosphate, giving you a figure of $0.414 per pound of phosphate.

We have a good fertilizer calculator on the website of our soil testing lab at:http://soiltesting.tamu.edu/webpages/calculator.html You will see an agricultural fertilizer calculator, a nitrogen cost calculataor and a nitrogen cost calculator in blended fertilizer.

I hope this helps.
Travis Miller
Texas A&M AgriLife Extension Service