Soil Test Fertilizer Recommendations for Alabama Crops

 

Nutrient Recommendations for

Shrubs and Perennial Flowers

(Crop Code No. 80)

Phosphorus

Potassium

Very high
High
Medium
Low
Very low

Pounds N-P2O5-K2O per acre

Very high
120-0-01
120-0-01
120-0-602
120-0-1203
120-0-1203

High
120-0-01
120-0-01
120-0-602
120-0-1203
120-0-1203

Medium
120-60-08
120-60-08
120-60-604
120-60-1205
120-60-1205

Low
120-120-06
120-120-06
120-120-609
120-120-1207
120-120-1207

Very Low
120-120-06
120-120-06
120-120-609
120-120-1207
120-120-1207

 

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 = 130 - 2.55X
1
Y = 130 - 1.08X
3
Y = 120 - 0.50X
2
Y = 130 - 0.72X
4
Y = 130 - 2.55X
3
Y = 130 - 0.54X

4
Y = 140 - 0.52X
* - 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

One ton limestone per acre is approximately equivalent to 50 pounds per 1,000 square feet.

1 - Per 100 square feet apply one cup ammonium nitrate or equivalent in early spring and repeat in early summer.

2 - Per 100 square feet apply one pint 15-0-15 or equivalent in early spring and then apply one cup ammonium nitrate or equivalent in early summer.

3 - Per 100 square feet apply one pint 15-0-15 or equivalent in early spring and repeat in early summer.

4 - Per 100 square feet apply one quart 8-8-8 or equivalent in early spring and then apply one cup ammonium nitrate or equivalent in early summer.

5 - Per 100 square feet apply one quart 8-8-8 or equivalent in early spring and then apply one pint 15-0-15 in early summer.

6 - Per 100 square feet apply 1.5 pints superphosphate or equivalent and one cup ammonium nitrate or equivalent in early spring and then apply one cup ammonium nitrate in early summer.

7 - Per 100 square feet apply one quart 8-8-8 or equivalent in early spring and repeat in early summer.

8 - Per 100 square feet apply 0.75 pint superphosphate or equivalent plus one cup ammonium nitrate or equivalent in early spring then one cup ammonium nitrate or equivalent in early summer.

9 - Per 100 square feet apply 0.75 pint superphosphate or equivalent plus one quart 8-8-8 or equivalent in early spring then apply one cup ammonium nitrate or equivalent in early summer.

Final Remark. For small areas, comments give examples of ways to meet the fertilizer recommendations. Other fertilizer grades or materials that supply equivalent amounts of plant nutrients may be used with equal results. If you need assistance in calculating amounts of other materials to use contact your county agent or fertilizer supplier.

Shrubs - Final remark on liming. For shrubs such as azaleas, gardenias, and rhododendron, which require acid soil, do not apply lime. If the pH is below 5.0 you may wish to check with your county agent concerning the advisability of using a reduced rate of lime for these shrubs.

K requirement level

2

N rate

120

Lime code no.

1

PK code no.

16

Mg code no.

2

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