Soil Test Fertilizer Recommendations for Alabama Crops

 

Nutrient Recommendations for

 Corn

(In Rotation Before Soybeans)

(Crop Code No. 15)

Phosphorus

Potassium

Very high
High
Medium
Low
Very low

Pounds N-P2O5-K2O per acre

Very high

120-0-0
120-0-0
120-0-80
120-0-120
120-0-160

High

120-0-0
120-0-0
120-0-80
120-0-120
120-0-160

Medium

120-80-0
120-80-0
120-80-80
120-80-120
120-80-160

Low

120-160-0
120-160-0
120-160-80
120-160-120
120-160-160

Very low

120-160-0
120-160-0
120-160-80
120-160-120
120-160-160

 

For more accurate fertilizer recommendations, use the equations below for your soil group:

Fertilizer Recommendation Formula
P2O5
K2O
Soil Group*
Equation**
Soil Group*
Equation**
1 & 2
Y = 160 -2.85X
1
Y = 160 -1.99X
3
Y = 160 -4.67X
2
Y = 160 -1.32X
4
Y = 160 -1.99X
3
Y = 160 -1.00X

4
Y = 160 -0.81X
* - Use Soil Group from soil test report, if available.
** - Y = pounds fertilizer P2O5 or K2O per acre required; X = soil test P or K

 

Comments

Corn on sandy soils may respond to nitrogen rates up to 150 pounds per acre. On sandy soils apply three pounds Zn per acre in fertilizer after liming or where pH is above 6.0. (Comment to be used only on Class 1 and Class 2 soils.)

K requirement level

1

N rate

120

Lime code no.

1

PK code no.

11

Mg code no.

1


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