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Illinois Fertilizer Conference Proceedings
January 26-28, 2006

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Table 1. Effect of N rate and tile treatment on wheat grain yield, test weights,
and flag-leaf N concentrations, Benton, 2004.
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Tile Treatment
Nitrogen Rate (lb acre)
 Average
0 30 60 90 120
 
---Wheat yield (bu/acre)---
Over 30' tiles 65 75 83 84 82 78
Between 30' tiles 63 73 78 80 85 76
Over 60' tiles 66 67 81 84 87 77
Between 60' tiles 61 66 77 78 83 73
Between 120' tiles 65 74 82 85 84 78
Averages 64 71 80 82 84  
 
---Test weights(lb/acre)---
Over 30' tiles 55.0 54.9 53.6 53.6 53.5 54.1
Between 30' tiles 54.6 54.5 54.0 53.8 53.1 54.0
Over 60' tiles 55.2 54.8 54.8 54.1 53.9 54.6
Between 60' tiles 55.4 55.2 54.1 54.0 53.7 54.5
Between 120' tiles 53.5 53.7 53.0 53.6 52.8 53.3
Averages 54.7 54.6 53.9 53.8 53.4  
 
---Flag leaf N(%)---
Over 30' tiles 2.79 2.98 3.31 3.40 3.76 3.25
Between 30' tiles 2.79 3.08 3.18 3.34 3.71 3.22
Over 60' tiles 2.86 2.93 3.15 3.41 3.56 3.18
Between 60' tiles 2.89 3.07 3.20 3.23 3.54 3.19
Between 120' tiles 2.74 3.00 3.07 3.18 3.53 3.10
Averages 2.81 3.01 3.18 3.31 3.62  
Statistical Contrasts Yield Test.Wt. Leaf N
N Rate *** *** ***
     linear *** *** ***
     quadratic *** NS NS
Tile Spacing NS NS NS
     120' vs. others NS NS NS
     30' vs. 60' NS NS NS
     over vs. between NS NS NS
N × TS NS NS NS
     lin. × 120' vs. othrs NS * NS
     lin. × 30' vs. 60' NS NS **
     lin. × over vs. betw. NS NS NS

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

 

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