Tillage and Nitrogen Placement Effects on Yields in a Short-Season Corn/Wheat/ Double-Crop Soybean Rotation
Tillage and Nitrogen Placement Efec ts on Yields in a Short-Season Corn/W heat/ Double-Crop Soybean Rotation
D. W. Sweeney 0
0 Kansas State University , USA
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Tillage and Nitrogen Placement Efec ts on Yields in a Short-Season Corn/
W heat/ Double-Crop Soybean Rotation
In 2016, adding nitrogen (N) greatly improved average wheat yields, but the response to tillage and different
N placement methods was minimal. Double-crop soybean yields were unaffected by tillage or the residual
from N treatments that were applied to the previous wheat crop.
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Tillage and Nitrogen Placement Effects
on Yields in a Short-Season Corn/Wheat/
Double-Crop Soybean Rotation
In 2016, adding nitrogen (N) greatly improved average wheat yields, but the response
to tillage and different N placement methods was minimal. Double-crop soybean yields
were unaffected by tillage or the residual from N treatments that were applied to the
previous wheat crop.
Many crop rotation systems are used in southeastern Kansas. This experiment is
designed to determine the long-term effect of selected tillage and N fertilizer placement
options on yields of short-season corn, wheat, and double-crop soybean in rotation.
A split-plot design with four replications was initiated in 1983 with tillage system as
the whole plot and N treatment as the subplot. In 2005, the rotation was changed to
begin a short-season corn/wheat/double-crop soybean sequence. Use of three tillage
systems (conventional, reduced, and no-till) continues in the same areas as the previous
22 years. The conventional system consists of chiseling, disking, and field cultivation.
Chiseling occurs in the fall preceding corn or wheat crops. The reduced-tillage system
consists of disking and field cultivation prior to planting. Glyphosate is applied to the
no-till areas prior to planting. The four N treatments for the crop are: no-N (control),
broadcast urea-ammonium nitrate (UAN; 28% N) solution, dribble UAN solution,
and knife UAN solution at 4 inches deep. The N rate for the corn crop grown in
oddnumbered years is 125 lb/a. The N rate of 120 lb/a for wheat is split as 60 lb/a applied
preplant as broadcast, dribble, or knifed UAN. All plots except for the no-N controls
are top-dressed in the spring with broadcast UAN at 60 lb/a N.
Results and Discussion
In 2016, conventional tillage resulted in 2 bu/a greater yield than with no-till (Table 1).
Overall, fertilizing with N quadrupled wheat yield, but preplant application method
(broadcast, dribble, or knife) did not affect yields. Average yield of soybean planted
doublecrop after wheat harvest was nearly 40 bu/a in 2016, but was not affected by tillage
systems or the residual from N fertilizer treatments that were applied to the wheat.
N Fertilization No-N control Broadcast UAN † Dribble UAN Knife UAN LSD (0 .05)
†UAN: urea-ammonium nitration solution , 28% N.