Agronomy Journal Journal of Natural Resources and Life Sciences Education
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Published online 27 April 2005
Published in Agron J 97:690-697 (2005)
DOI: 10.2134/agronj2004.0156
© 2005 American Society of Agronomy
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Tillage and Urea Ammonium Nitrate Fertilizer Rate and Placement Affects Winter Wheat following Grain Sorghum and Soybean

K. W. Kelley* and D. W. Sweeney

Kansas State Univ., Southeast Agric. Res. Cent., P.O. Box 316, Parsons, KS 67357. Kansas Agric. Exp. Stn. Contribution no 040397-J



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  		Fig. 1. Effects of previous crop [grain sorghum (GS) and soybean (Soy)], tillage [reduced tillage (RT) and no-tillage (NT)], N rate [67 kg N ha–1 (67 N) and 134 kg N ha–1 (134 N)], and N placement [surface-broadcast (BC) and subsurface-knife (KN] on wheat yield for 1993, 1995, 1997, 1999, 2001, and 5-yr mean. Within each year, bars with the same letter are not statistically different at the 0.05 level according the protected LSD test.

 


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  		Fig. 2. Interactive effects of previous crop (grain sorghum and soybean), tillage (reduced till and no-till), N rate [67 kg N ha–1 (67 N) and 134 kg N ha–1 (134 N)], and N placement [surface-broadcast (BC) and subsurface-knife (KN)] on wheat yield averaged over 5 yr.

 


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  		Fig. 3. Effects of previous crop [grain sorghum (GS) and soybean (Soy)], tillage [reduced tillage (RT) and no-tillage (NT)], N rate [67 kg N ha–1 (67 N) and 134 kg N ha–1 (134 N)], and N placement [surface-broadcast (BC) and subsurface-knife (KN)] on plant N uptake for 1993, 1995, 1997, 1999, 2001, and 5-yr mean. Within each year, bars with the same letter are not statistically different at the 0.05 level according the protected LSD test.

 


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  		Fig. 4. Interactive effects of previous crop (grain sorghum and soybean), tillage (reduced till and no-till), N rate [67 kg N ha–1 (67 N) and 134 kg N ha–1 (134 N)], and N placement [surface-broadcast (BC) and subsurface-knife (KN)] on plant N uptake averaged over 5 yr.

 




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