Soil Test Fertilizer Recommendations for Alabama Crops

 

Nutrient Recommendations for

Pecans

(Crop Code No. 94)

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

Pecans - Final remark. Apply P and K as recommended above. For trees 20 years old or more apply six to eight pounds N (20 to 25 pounds ammonium nitrate or equivalent) per tree or 100 pounds N per acre broadcast in February. For younger trees apply one-half pound of N (1.5 pounds ammonium nitrate or equivalent) per tree per year of age. For trees four years and older showing zinc deficiency appy 35 to 50 pounds of Zn (100 to 140 pounds 36% Zn sulfate) per acre and disk into topsoil to about six inches. In addition, apply two to four foliar sprays of zinc sulfate at the rate of two to four pounds per 100 gallons of water during April and early May the first year after soil application. Thereafter, monitor Zn leaf levels by leaf analysis. For younger trees apply one-fourth pound of Zn per tree per year of tree age and work into soil. Full benefit from fertilization will not be obtained unless a good spray program for disease and insect control is followed.

K requirement level

1

N rate

*

Lime code no.

2

PK code no.

20

Mg code no.

2

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