Current nitrogen recommendations assume four things yield potential doesn't vary year after year, the yield level the soil will support without supplemental nitrogen is negligible, pre-plant nitrogen will be available throughout the growing season, and soil uniformity produces similar yield results across the field. Growers know that none of these assumptions are entirely accurate, and they can potentially be avoided using optical sensors.
More Quotes from Robert Mullen:
It is intuitive that higher corn yields will result in greater nitrogen demand from the soil, but does that translate into higher nitrogen demand Investigation of nitrogen rate studies conducted over several years reveals that there is not a strong relationship between maximum yield potential and the amount of nitrogen needed to achieve maximum yield.Robert Mullen
It boils down to an exercise in risk management. The old system uses a single value, while this new system gives farmers a range to work with. If farmers are risk averse, they can use the high side of the rate range. If they are more willing to accept risk, they can use a lower side of the rate range, increasing their potential for economic reward.
Robert Mullen
Is it always economical to shoot for maximum yield Research has shown that it's not. It may take the same amount of nitrogen to reach 179 bushels per acre as it does to only reach 170 bushels per acre. It's impossible to determine at what point the nitrogen level is reached to where it is no longer a benefit to gain more yield without a nitrogen rate trial in every field.
Robert Mullen
Nitrogen efficiency in crop production, such as corn, is estimated to be only about 33 percent, suggesting that under current nitrogen recommendation methods the majority of nitrogen applied is going elsewhere other than into the crop. On top of that, it's becoming more of an economic penalty to over-apply nitrogen.
Robert Mullen
So, utilizing yield potential to dictate nitrogen recommendations may not be the most effective method, especially when nitrogen costs are high. Historically, we've treated excess nitrogen as cheap crop insurance. While it was then, that's not the case anymore.
Robert Mullen
Farmers may not yet be 100 percent comfortable with the changes, but they understand why it's being done and can see the value in it. All land-grant universities in the North Central region are moving toward a similar basis for generating nitrogen recommendations.
Robert Mullen
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