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Illinois Fertilizer Conference Proceedings
January 26-28, 2006

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Table 6. Effect of direct application of P rates and K rates on
corn and soybean grain yields under two tillage systems
for two locations in southern Illinois, average 2001-05. spacer

Variable Average 2001-05 Average 2001-05
Dixon Springs Belleville Dixon Springs Belleville
CT
NT
CT
NT
CT
NT
CT
NT
   ------------------bu⁄acre Grain Yield------------------
Check(no P or K) 106 127 186 179 35 47 62 64
P Rate‡
0 lb⁄a P2O5 139 136 188 189 42 49 63 65
40(60†) 144 132 188 189 41 50 63 65
80(120) 139 135 187 189 41 48 63 65
120(180) 142 133 190 193 41 50 63 65
K Rate‡
0 lb⁄a K 2O 139 131 186 185 42 50 64 65
40(80†) 139 135 192 193 41 49 63 65
80(160) 141 135 188 190 42 49 63 65
120(240) 146 136 187 191 42 49 63 65
Annual vs Biennial

AP & AK

148 142 186 191 42 50 63 66

BP & BK (corn)

147 135 188 193 43 59 64 65

BP & BK (soy)

130 133 186 183 42 51 62 66
BP (corn) & BK (soy) 139 128 190 187 42 47 62 64
BP (soy) & BK (corn) 145 139 185 194 42 50 64 66

† 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.

 

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