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?
Minnehaha County South Dakota
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.
Texas A&M AgriLife Extension Service