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SW Minnesota | My neighbor and I want to try out side dressing our corn for the 2015 season so we bought a used 28% applicator together. Now I'm trying to figure out my fertilizer needs for 2015 so I can put together my fertilizer order.
So my question is: How much can I reduce my total N rate when part of it is put on at the optimal time by side dressing? For example:
Just to keep things simple, let's use the old standby N rate of 1 unit of N per bushel of yield goal. For my area, I set my yield goal at 200 bu/A but I use a 180 bu/A yield for figuring my N use because realistically it usually takes less than a unit of N per bushel of yield. So here's the scenario, planting 2015 corn where there were soybeans in 2014:
180 bushel corn - 180 units of N
credit for 50 bu soybeans - 50 units
credit for N in 5 gal 10-34-0 starter - 5 units
credit for N in 150 lbs/A MESZ - 18 units
credit for N in 10 gal/A 28% - 28 units
Now if you subtract all of the credits from 180, you end up needing 79 more units of N. So that means I need about 100 lbs of NH3 (total) to complete this scenario.
This is where my question comes in now - how much can I reduce the NH3 rate because of the optimal timing/placement advantage of side dressing?
Thanks!
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How much can I reduce my N rate by side dressing?
