Soil Test Fertilizer Recommendations for Alabama Crops

 

Nutrient Recommendations for

Small Grain - Soybean Rotation

(Crop Code No. 25)

Phosphorus

Potassium

Very high
High
Medium
Low
Very low

Pounds N-P2O5-K2O per acre

Very high
100-0-0
100-0-0
100-0-80
100-0-120
100-0-160

High
100-0-0
100-0-0
100-0-80
100-0-120
100-0-160

Medium
100-80-0
100-80-0
100-80-80
100-80-120
100-80-160

Low
100-160-0
100-160-0
100-160-80
100-160-120
100-160-160

Very low
100-160-0
100-160-0
100-160-80
100-160-120
100-160-160

 

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 = 180 - 3.41X
1
Y = 160 -1.99X
3
Y = 180 - 5.60X
2
Y = 160 -1.32X
4
Y = 180 - 2.38X
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

If the recommended amounts of P and K are applied to small grain in the fall, no additional P or K should be needed for soybeans the following year.

For small grains and ryegrass planted on fallowed fields in early September for grazing, apply 100 pounds of N at planting and 60 pounds in early spring for grazing or grain. Those crops grown for grain only should receive 20 pounds of N in the fall and 60 pounds in the spring. Ryegrass planted alone for grazing should receive no more than 60 pounds of N in the fall and up to 100 pounds N in the early spring.

K requirement level

1

N rate

100

Lime code no.

1

PK code no.

11

Mg code no.

1

 

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