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Re: Fwd: Nitrogen application rates

Well, they are both monocots!
On Sunday, February 16, 2003, at 08:29 PM, Bonnie & Bill Morgan wrote:

Great info, Cathy! I imagine that applies to what we put on our lawns after
a fashion, too.



-----Original Message-----
From: owner-gardenchat@hort.net [mailto:owner-gardenchat@hort.net] On Behalf
Of cathy carpenter
Sent: Sunday, February 16, 2003 3:35 PM
To: gardenchat@hort.net
Subject: [CHAT] 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 <roeggem@uiuc.edu>
Date: Fri Feb 07, 2003  01:47:14 PM US/Central
To: roeggem@uiuc.edu
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:roeggem@uiuc.edu
Phone: 217-223-8380         FAX: 217-223-9368
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