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southern MN | I have variable rate P and K spread, with urea (160 on bean stubble, 180 corn on corn) and probably sulfur.
Field cultivate.
Plant with 100lb of starter 2x2 on the planter only 9# of n in it.
I have clayish soils, 3.5-9.5 organic matter, CEC 15-42.
I used to do spring NH3, but workload, fuel, and the coop is already making a trip, and...
I wonder if a split application side dress wouldn't be better; but run down a lot of corn doing that, and workload and timing with rains and hay making and such....
We had a good year locally last year, had corn on either side of 200bu.
Last year we had miserable rain, biggest summer flood I've ever seen on this farm, and got 120-160bu corn. Some of my fields had 5 feet of water on them.....
The year before that was wet spring, very very dry fall, got 120 all over. (I used 20# less N that year.) I think the wet spring flushed N, but the dry fall would not have responded to side dressing anyhow the corn quit growing it got so dry.
So, donno. My heart says side dressing some would be a better plan, but reality - in perfect conditions I can get over 220 bu on broadcast urea; in bad conditions I don't see the opportunity to actually recover with a side dress.
(Yes my heavy soils likely help me as they mineralized some N by fall if they stay dry - that's why I included those numbers.)
I'm not sure what this helps you, maybe those that know something on this topic can pick my stuff apart. :)
Paul | |
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Does anyone use only urea for corn nitrogen needs ?
