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 1
D. Ruiz-Diaz 0 1
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0 Kansas State University , USA
1 Kansas State University Agricultural Experiment Station and Cooperative Extension Service , USA
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Tillage and Nitrogen Placement Effects
on Yields in a Short-Season Corn/Wheat/
Double-Crop Soybean Rotation
D.W. Sweeney and D. Ruiz-Diaz1
In 2018, adding nitrogen (N) greatly improved average wheat yields with about a 10%
increase with knife compared to broadcast application methods. Even though tillage did
not affect wheat yields, soybean yield was about 10% greater with no-till.
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) continued in the same whole plots as the previous
22 years. The conventional system consisted of chiseling, disking, and field cultivation.
Chiseling occurred in the fall preceding corn or wheat crops. The reduced-tillage system
consisted of disking and field cultivation prior to planting. Glyphosate was applied to
the no-till areas prior to planting. The four N treatments for the crop were: no-N
(control) and N fertilizer placement as broadcast, dribble (surface band), and knife
(subsurface band at 4 inches deep) UAN (28% N) solution. The N rate for the corn crop
grown in odd-numbered years was 125 lb/a. The N rate of 120 lb/a for wheat was split
as 60 lb/a applied pre-plant as broadcast, dribble, or knifed UAN. All plots except for
the no-N controls were top-dressed in the spring with broadcast UAN at 60 lb/a N.
Results and Discussion
In 2018, tillage system did not affect wheat yield (Table 1). Overall, fertilizing with
N quadrupled wheat yield. Preplant N application by knifing resulted in 10% greater
wheat yield than with broadcast, with dribble application resulting in intermediate
yields. The average yield of soybean planted doublecrop after wheat harvest was nearly
1Department of Agronomy, Kansas State University, Manhattan, KS.
50 bu/a in 2018 and no-till was about 10% greater than with tillage. There was no
residual effect on soybean yields from N applied by different pre-plant methods to the
previous wheat crop.
Wheat yield Double-crop soybean yield
?UAN: urea-ammonium nitration solution, 28% N.