Fwd: Nitrogen application rates
Thought there might be some interest in this information on Nitrogen
application rates from our extension ag educator. It is intended for
farmers, but contains food for thought for us all.
Begin forwarded message:
> From: Mike Roegge <firstname.lastname@example.org>
> Date: Fri Feb 07, 2003 01:47:14 PM US/Central
> To: email@example.com
> Subject: Nitrogen application rates
> Weekly Crop Update 2-7-03
> By Mike Roegge, University of Illinois Extension, Adams/Brown Unit
> Our featured speaker at the recently held No Till Seminar, Dr. Fred
> Below, presented his research on nitrogen rates. He looked at N rates
> over a three-year period in a variety of cropping situations: no till,
> conventional, C-SB and C-C rotations, on producersm fields and on
> research farms. His objective was to determine the optimal rate of
> nitrogen for plant yield. Not necessarily the economic rate, but the
> rate at which, biologically, the plant quit responding.
> With over 40 site years of data, his findings were that in no
> circumstances, did the corn crop require any more than 1.2 pounds of N
> per bushel of yield. For many years, this has been the U of I
> recommendation. And it hasnmt changed.
> Actually, the average requirement was 0.9 pounds of N per bushel of
> yield. The same need was found regardless of environment grown (tilled,
> preceding crop, etc.). Interestingly enough, when plotted against
> yield, those fields that yielded the lowest required the highest amount
> of N (per bushel). The higher the productivity of the soil, the lower
> the amount of N needed per bushel of grain.
> If nothing else, this work proved again, that 1.2 pounds of N per
> bushel of corn is all that is necessary. There is already some lfluffn
> built into this recommendation, so making applications of higher rates
> of N only costs additional dollars and risks higher N losses.
> Of course, make sure when you account for the 1.2 pounds, you include
> incidental N (starter, DAP, 28%, etc.) and also take the soybean N
> credit if that was your prior crop.
> We still have approximately 50% of the corn acres to receive
> nitrogen this spring. Many producers still use rates higher than
> recommended as insurance against the year when crop yields go through
> the roof. They donmt want to get caught short. However, based upon this
> research, and on other N research conducted by the U of I, there is no
> need to lfluffn your N rate. Data from Dr. Bob Hoeft over an 18 year
> time period found similar results. He found that by increasing N rate
> by 30-40 pounds per acre over the 1.2 pounds actually led to decreased
> net income.
> Mike Roegge University of Illinois Extension
> 330 S. 36th Street Adams/Brown Unit
> Quincy, IL 62301 Mailto:firstname.lastname@example.org
> Phone: 217-223-8380 FAX: 217-223-9368
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