PLANT ANALYSIS and FERTILIZER RECOMMENDATIONS

Black Walnut tree leaf samples were collected and analyzed for Phosphorus, Potassium, Calcium, Magnesium, Sulfur, Sodium, Copper, Iron, Manganese, Zinc, Boron, Aluminum, and Molybdenum, using double acid extraction methods. Nitrogen was analyzed by Micro-Kjeldahl method. Results are presented in Table 2. Nitrogen content of Black Walnut trees range from 2.5-3.5 percent. If percentage decrease less than 2.0 percent serious yellowing of leaves were noticed and application of 40-50 lbs/acre actual Nitrogen are then recommended to increase the Nitrogen level in plants up to 3.0 percent.

Phosphorus is a very important element in development of Black Walnut trees. Phosphorus is an essential element in every metabolic process. A healthy Black Walnut tree will maintain 0.3 - 0.4 percent Phosphorus in leaves. Because of poor availability in soil, I strongly recommend to maintain 150-250 lbs/acre soil phosphate level and an application of 400 lbs/acre 18-48-0 or diammonium phosphate is recommended if available soil phosphate level is low or less than 50 lbs/acre in soil. Soil pH plays a major role of making phosphate fertilizer recommendations on very low pH or when pH range is 5.5 - 6.5 on application of 500 lbs/acre triple super phosphate would increase the phosphorus availability in soil and increase the phosphorus uptake for all ages of Black Walnut trees. Ranges of Calcium, Magnesium, Potassium, Sulfur, Copper, Iron, Manganese, Zinc, Boron, Aluminum, and Molybdenum are given in Table 2. Sufficiency ranges of all major elements are established and present in Table 3.

K Labs can test your soil and plant samples and would make fertilizer recommendation for all given essential plant nutrients of Black Walnut trees. Contact us for details or send us an E Mail:
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TABLE 2: Plant tissue analysis for two, eight, and twelve year old Black Walnut Tree



 
Parameters 2 Years 8 Years 12 Years
Nitrogen % 2.59 3.12 2.95
Phosphorus % 0.28 0.37 0.42
Potassium % 0.48 0.85 0.75
Calcium % 3.12 2.15 1.10
Magnesium % 0.41 0.28 0.34
Sodium % 0.09 0.02 0.01
Sulfur % 0.15 0.18 0.12
Copper ppm 11.00 5.00 5.90
Iron ppm 345.00 230.00 95.00
Manganese ppm 160.00 110.00 50.00
Zinc ppm 36.50 35.00 33.50
Boron ppm 18.00 26.00 20.00
Aluminum ppm 75.00 110.00 50.00
Molybdenum ppm 0.72 0.57 0.35


*Samples were collected in the month of June

TABLE 3: Maximum and Minumum Nutrient Concentration in mature Black Walnut Trees. Samples collected in June, July, August, during Growing Season.



 
Parameters Deficient-A Low-B Sufficient-C High-D Excessive-E
Nitrogen % 1.00 1.01-2.00 2.01-5.00 5.10-7.50 >7.50
Phosphorus % 0.10 0.11-0.25 0.26-0.39 0.40-1.00 >1.00
Potassium % 1.00 1.01-2.00 2.10-4.00 4.10-5.50 >5.50
Calcium % 0.20 0.21-0.50 0.51-1.00 1.00-10.0 >10.00
Magnesium % 0.10 0.11-0.25 0.26-2.50 2.51-10.0 >10.00
Sulfur % 0.11 0.12-0.21 0.22-0.55 0.55-1.00 >1.00
Zinc ppm 10.00 11.00-25.00 26.00-50.00 51.00-100.00 >100.00
Boron ppm 5.00 5.00-15.00 15.10-50.00 50.10-100.00 >100.00
Manganese ppm 25.00 26.00-45.00 46.00-500.00 500.00-750.00 >750.10
Iron ppm ------ 0.00-40.00 40.10-350.00 350.10-500.00 >500.00
Copper ppm 5.00 5.00-15.00 15.10-75.00 75.10-150.00 >150.10
Aluminum ppm ------ 0.00-40.99 41.00-150.00 151.00-350.00 >350.00
Molybdenum ppm 0.20 0.21-0.59 0.60-10.00 10.10-250.00 >25.00


A. Plants with visible symptoms of deficiency.
B. Plants with normal appearance but probably will be responsible to fertilization with this element.
C. Plants contain an adequate amount of this element for maximum yield.
D. Optimum yield can be expected, however concentration of this element is higher than normal.
E. Nutrient level too high, plants may show nutritional disorger or stunted growth.

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