Soil Test Fertilizer Recommendations for Alabama Crops

 

Nutrient Recommendations for

Irrigated Corn, Corn, or Sorghum Silage

(Crop Code No. 16)

Phosphorus

Potassium

Very high
High
Medium
Low
Very low

Pounds N-P2O5-K2O per acre

Very high
180-0-0
180-0-30
180-0-60
180-0-120
180-0-120

High
180-30-0
180-30-30
180-30-60
180-30-120
180-30-120

Medium
180-60-0
180-60-30
180-60-60
180-60-120
180-60-120

Low
180-120-0
180-120-30
180-120-60
180-120-120
180-120-120

Very low
180-120-0
180-120-30
180-120-60
180-120-120
180-120-120

 

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 = 110 - 1.25X
1
Y = 130 - 1.23X
3
Y = 110 - 2.08X
2
Y = 130 - 0.82X
4
Y = 110 - 0.87X
3
Y = 130 -0.62X

4
Y = 130 - 0.54X
* - 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

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 2 soils.)

K requirement level

1

N rate

180

Lime code no.

1

PK code no.

26

Mg code no.

1

 

Home

Nutrient
Recommendations