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Illinois Fertilizer Conference Proceedings
January 26-28, 2006

Home 2006 Index Search

Table 5. Effect of direct application (in 2005) of P rates
and K rates on corn and soybean grain yields under two
tillage systems for two locations in southern Illinois, 2005.
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Variable 2005 Corn Results 2005 Soybean Results
Dixon Springs Belleville Dixon Springs Belleville
CT
NT
CT
NT
CT
NT
CT
NT
   --------------------------bu⁄acre Grain Yield-------------------------
Check(no P or K) 94 119 182 180 41.1 64.3 52.5 70.2
P Rate‡
0 lb⁄a P2O5 149 121 197 192 47.8 67.2 56.5 71.2
40(60†) 161 120 194 193 45.8 67.1 56.7 73.8
80(120) 138 121 196 192 47.3 66.0 55.7 72.1
120(180) 149 120 195 193 47.4 66.4 58.9 74.4
K Rate‡
0 lb⁄a K 2O 151 119 191 192 45.7 67.3 58.3 71.8
40(80†) 148 120 203 196 46.9 67.6 57.1 73.8
80(160) 145 121 194 191 48.2 66.6 55.8 73.3
120(240) 154 121 195 191 47.6 65.4 56.7 72.6
Annual vs Biennial

AP & AK

163 120 197 193 45.0 66 57.2 74

BP & BK (corn)

158 121 192 193 46.0 67 58.1 68

BP & BK (soy)

129 121 189 195 50.6 65 64.9 74
BP (corn) & BK (soy) 137 118 198 190 44.3 67 54.3 71
BP (soy) & BK (corn) 163 122 193 193 45.9 68 58.5 76
LSD0.05
 36.3 3.9 22.5 13.6 9,8 5.2 6.8 49
ANOVA ---------------------------Significanceξ------------------------------
Ck vs others *** NS * ** * NS * NS
P Rate                
     P linear NS NS NS NS NS NS NS **
     P quadratic NS NS NS NS NS NS NS NS
K Rate                
     K Linear NS ** NS NS NS NS NS NS
     K quadratic NS NS NS NS NS NS NS NS
P × K                
     Plin×Klin NS NS NS NS 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.

 

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