SOIL and PLANT ANALYSIS and FERTILIZER RECOMMENDATIONS FOR BLACK WALNUT TREES

Dr. Akhtar Khwaja Ph.D.(a) and Ruma Roy (b)

Soil and plant analysis are important for predicting nutrient requirements for plants. This paper will cover the important information on soil chemistry of Black Walnut Trees, and fertilizer recommendations to optimize the growth. K Labs has received over 200 soil samples from 15 different states.

These soil samples were analyzed for pH, Buffer pH, Organic Matter Content, Available Phosphorus and fixed Phosphorus, Total Available Potassium, Calcium, Magnesium, Sodium, Sulfate-Sulfur, Copper, Iron, Manganese, Zinc, Boron, Aluminum, and Molybdenum. Samples were also calculated for Cation Exchange Capacity (CEC) and Base Saturation percentage of Potassium, Magnesium, Calcium, Sodium, and Hydrogen.

Fertilizer recommendations are given based on pH, available Phosphorus, Calcium, Potassium, Magnesium, and trace minerals. In our formulation of various fertilizer materials, the Calcium and Magnesium and soil physical and chemical characteristics were under major consideration.

Soil analysis results are presented in Table 1 indicating seven different field of range from one year to 30 years old. Soil pH ranges from 5.9 to 7.4. Most of the fields in the plantation were tested and the best pH was 6.6 of 10-15 year old plantation. Therefore, if we can maintain pH between 6.0-6.9 this would be considered best for most of the Black Walnut tree plantation. Acid soil or presence of high Manganese and Aluminum reduces the tree's growth. Soil Phosphorus should be maintained between 200-300 lb.. per acre in soil. Soil Potassium levels should range between 200-300 lb.. per acre and soil Calcium levels should be between 2000-3000 lb.. per acre. Typical soil analysis of Black Walnut Trees are presented in Tables 1. K Labs offers detailed recommendations to improve the soil for all ages.

Table 1: Soil chemical characteristics of the field where black walnut trees are grown successfully from one to 30 years old



 
Parameters

1

2

3

4

5

6

7
pH --------- 6.40 7.20 6.60 7.40 6.90 6.80 5.90
Buffer pH --------- 6.80 --------- 6.90 --------- --------- --------- ---------
Organic Matter % 2.30 3.00 1.70 1.00 1.70 3.80 3.40
ENR -------- 47.00 60.00 34.00 21.00 33.00 76.00 69.00
Phosphorus P-1 lbs/ac 328.00 84.00 119.00 156.00 104.00 136.00 54.00
Phosphorus P-2 lbs/ac 425.00 115.00 149.00 195.00 144.00 150.00 216.00
Potassium lbs/ac 320.00 190.00 112.00 88.00 118.00 394.00 216.00
Magnesium lbs/ac 400.00 500.00 126.00 90.00 344.00 280.00 120.00
Calcium lbs/ac 2240.00 2980.00 1980.00 1548.00 3100.00 2100.00 1840.00
Sodium lbs/ac 38.00 40.00 54.00 70.00 115.00 39.00 33.00
Sulfur lbs/ac 47.00 15.00 11.00 8.00 12.00 6.00 7.00
Copper ppm 1.16 1.12 0.42 0.26 0.42 0.32 0.66
Iron ppm 99.00 55.00 59.00 34.00 50.00 29.00 37.00
Manganese ppm 9.54 9.88 19.46 10.94 22.80 10.22 27.26
Zinc ppm 4.48 4.08 1.46 1.00 0.58 0.84 1.96
Boron ppm 0.96 0.96 0.76 0.97 0.96 0.75 0.91
Aluminum ppm 31.00 30.00 --------- --------- --------- 50.00 45.00
Molybdenum ppm 0.71 0.64 0.45 0.54 0.64 0.50 0.60
CEC m.eq/100g 8.10 8.90 6.00 4.50 9.50 7.00 6.10
Potassium % 5.00 2.50 2.40 2.50 1.60 7.20 4.60
Magnesium % 20.20 20.75 8.60 8.50 14.60 16.40 8.20
Calcium % 68.80 75.70 81.80 85.20 81.00 74.70 76.00
Sodium % 1.00 0.90 1.90 3.40 2.60 1.20 1..20
Hydrogen % 4.90 --------- 5.30 --------- --------- 7.00 6.60



1. New Planting- Tolono, Florida
2. Planted 1993- Milwaukee, Wisconsin
3. Twelve years- Belmont, Mississippi
4. Six years- Belmont, Mississippi
5. Small Seedling- Belmont, Mississippi
6. Planted 1969- Lanesville, Indiana
7. Planted 1973- Lanesville, Indiana

(a)Dr. Akhtar Khwaja Ph.D., Soil Scientist, K Labs
(b)Ruma Roy, Chemist, K Labs

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