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Illinois Fertilizer Conference Proceedings
January 26-28, 2006

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Table 2. Effect of N rate and tile treatment on corn grain yield
and ear-leaf N concentrations, Benton, 2005
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Tile Treatment
Nitrogen Rate (lb acre)
 Average
0 50 100 150 200
 
---Corn yield (bu/acre)---
Over 30' tiles 119 154 192 197 178 168 a
Between 30' tiles 115 152 156 172 177 155 c
Over 60' tiles 122 162 185 183 173 165 ab
Between 60' tiles 117 149 151 174 174 153 c
Between 120' tiles 117 158 164 173 173 157 bc
Averages 118 155 167 178 175 LSD = 9.7
 
---Corn Stands (1000 plants/acre)---
Over 30' tiles 29.5 30.2 30.0 30.8 28.8 29.9 b
Between 30' tiles 29.8 30.5 30.1 30.6 29.9 30.2 ab
Over 60' tiles 31.2 31.4 30.6 30.0 29.6 30.6 ab
Between 60' tiles 28.3 29.4 28.3 28.7 29.6 28.8 c
Between 120' tiles 30.5 31.0 30.6 31.2 31.3 30.9 a
Averages 29.8 30.5 29.9 30.2 29.9 LSD = 0.9
 
---Ear-leaf N(%)---
Over 30' tiles 1.47 1.88 2.38 2.48 2.59 2.16
Between 30' tiles 1.43 2.01 2.14 2.54 2.43 2.11
Over 60' tiles 1.29 2.13 2.21 2.44 2.55 2.12
Between 60' tiles 1.51 1.94 2.38 2.46 2.43 2.15
Between 120' tiles 1.71 2.01 2.13 2.41 2.44 2.14
Averages 1.48 1.99 2.25 2.46 2.49 LSD = NS
Statistical Contrasts Yield Test.Wt. Leaf N
N Rate ***   NS   ***  
     linear ***   NS   ***  
     quadratic ***   NS   ***  
Tile Spacing NS   **   NS  
     120' vs. others NS   **   NS  
     30' vs. 60' NS   NS   NS  
     over vs. between **   NS   NS  
N × TS NS   NS   NS  
     lin. × 120' vs. othrs NS   NS   **  
     lin. × 30' vs. 60' NS   NS   NS  
     lin. × over vs. betw. NS   NS   NS  

***, **, * refer to significance AT the 1%,5%, and 10%
levels, respectively

 

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