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| In my experience and from what I read, you need around 2.6#N/bushel of yield for winter wheat (soft white). Spring wheat is somewhere around 3#N/bushel of yield, with the red wheat needing more to reach desired protein levels. From what you said you had enough total N in the ground (105#) for expected yeilds of around 40 bushel/acre (105/2.6=40.99). Using the 2.6# figure, you need around 182#N total (applied plus natural expected release in soil) to get 70 bushel wheat.
I'd guess the last crop used up a lot of the residual N in the soil and you were just short. One important question-how deep was the soil test taken? If only 3 ft., then I may be wrong. We use 6ft for winter wheat and 4ft for spring wheat.
FWIW
Art
Edited by Art Swannack 9/28/2008 20:15
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Winter wheat
