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Illinois Fertilizer Conference Proceedings
January 26-28, 2006

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Table 3. Effect of direct application (in 2004) of P rates and
K rates on corn ear-leaf P and K concentrations under two tillage
systems for two locations in southern Illinois, 2004.
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Variable Ear–leaf P Concentration Ear–leaf K Concentration
Dixon Springs Belleville Dixon Springs Belleville
CT
NT
CT
NT
CT
NT
CT
NT
   -------- % P Concentration ------- ------ % K Concentration --------
Check(no P or K) 0.26 0.24 0.29 0.26 1.21 1.24 1.84 1.55
P Rate‡
0 lb⁄a P2O5 0.28 0.27 0.29 0.29        
40(60†) 0.28 0.27 0.29 0.29        
80(120) 0.29 0.30 0.31 0.28        
120(180) 0.28 0.29 0.30 0.28        
K Rate‡
0 lb⁄a K 2O         1.56 1.70 2.05 1.72
40(80†)         1.79 1.79 1.98 1.69
80(160)         1.75 1.83 2.09 1.67
120(240)         1.73 1.92 1.93 1.79
ANOVA ---------------------------Significanceξ-------------------------------
Ck vs others NS ** * * *** *** ** **
P Rate                
     P linear NS NS NS NS N/A N/A N/A N/A
     P quadratic NS ** NS NS N/A N/A N/A N/A
K Rate                
     K Linear N/A N/A N/A N/A NS * NS NS
     K quadratic N/A N/A N/A N/A NS NS NS NS

† Rates in parentheses for Dixon Springs CT and NT.

‡ Means for P rates averaged across K rates and means for K rates averaged across P rates.

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

NS = non-significant. N/A means not applicable (not measured).

 

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