Centre county Pennsylvania, USA | Yes, that extra 39% is "inert material".... that you will have to carry with your planter. It's like the water "inert material" that you carry with your planter when you use liquid fertilizer. In both cases is extra weight with no extra fertilizer value.
When you order dry blend as tons of Urea, MAP, and Potash there will be no "inert material" for your planter to carry.
To do the math for ordering mix as tons of Urea, MAP, and Potash start with the Potash. compute pounds of Potash required to provide all of the K (or K2O) in your mix. Next, compute pounds of MAP required to provide all of the P (or P2O5) required in your mix. Then compute pounds of N that is in that MAP. Finally, compute pounds of Urea to provide the remaining pounds of N required in your mix. |
Fertilizer Math
