Soil Test Fertilizer Recommendations for Alabama Crops

 

Nutrient Recommendations for

Apples and Pears

(Crop Code No. 92)

Phosphorus

Potassium

Very high
High
Medium
Low
Very low

Pounds N-P2O5-K2O per acre

Very high
*-0-0
*-0-0
*-0-30
*-0-60
*-0-90

High
*-0-0
*-0-0
*-0-30
*-0-60
*-0-90

Medium
*-30-0
*-30-0
*-30-30
*-30-60
*-30-90

Low
*--60*0
*-60-0
*-60-30
*-60-60
*-60-90

Very Low
*-60-0
*-60-0
*-60-30
*-60-60
*-60-90

 

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 = 70 - 1.28X
1
Y = 80 - 1.10X
3
Y = 70 - 2.10X
2
Y = 80 - 0.74X
4
Y = 70 - 0.89X
3
Y = 80 - 0.55X

4
Y = 90 - 0.35X
* - 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

Apples - Final remark. For establishing new orchards, apply lime and P and K fertilizer as recommended and turn to depth of 12 to 16 inches, then repeat the application and disk into topsoil. Maintain soil pH in range of 6.0 to 7.0 by reliming as needed by soil test.

For annual maintenance apply P and K fertilizer as recommended. For young trees apply 0.1 pound N (10 ounces calcium nitrate) per tree and for 10 years or older trees apply 35 pounds N per acre. (Calcium nitrate is recommended as a source of N for apple.)

Zinc: To correct Zn deficiency in apples apply 0.08 pound Zn (0.24 pound zinc sulfate) per tree. Broadcast 20 to 25 pounds Zn (50 -70 pounds 36% zinc sulfate) per acre and disk into topsoil when establishing new plantings. No soil applications of zinc are usually needed on old orchard or crop land.

Boron: Make two sprays using one pound Solubor per 100 gallons of water. Begin at petal fall and repeat two weeks later. If B sprays are not used, make a soil aplication of two pounds B per acre annually.

Calcium: Make four sprays using either three pounds calcium nitrate or two pounds calcium chloride per 100 gallons of water. Begin two weeks after petal fall and repeat three times at two-week intervals.

For bitter pit: If calcium sprays are not made in early spring they should be applied as recommended above beginning eight weeks prior to anticipated harvest.

K requirement level

1

N rate

*

Lime code no.

2

PK code no.

20

Mg code no.

2

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