Blackberries - Home Garden (Code #096)
Soil Test RatingPotassium

Low K

Coast: 0-70 lbs/A

Pied: 0-120 lbs/A

Medium K

Coast: 71-170 lbs/A

Pied: 121-250 lbs/A

High K

Coast: 171-275 lbs/A

Pied: 251-400 lbs/A

Very High K

Coast: 275+ lbs/A

Pied: 400+ lbs/A

PhosphorusSee Comments

Low P

Coast: 0-30 lbs/A

Pied: 0-20 lbs/A

Medium P

Coast: 31-60 lbs/A

Pied: 21-40 lbs/A

High P

Coast: 61-100 lbs/A

Pied: 41-75 lbs/A

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Very High P

Coast: 100+ lbs/A

Pied: 75+ lbs/A

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Coast = Coastal Plain    Pied = Piedmont, Mountain, and Limestone Valley

Recommendations:

Recommended pH:6.0 to 6.5. If the pH is less than 6.0, see Lime Table B and the soil depth adjustment table that immediately follows the lime tables.
Magnesium:

If soil test Mg level is low and lime is recommended, use dolomitic limestone.

Coastal PlainLow: 0 - 60 lbs/acre Medium: 61 - 120 lbs/acre High: >120 lbs/acre
Piedmont Low: 0 - 120 lbs/acre Medium: 121 - 240 lbs/acre High: >240 lbs/acre

Comments:

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The phosphorus levels are high; therefore, no phosphorus (P) is needed. Apply fertilizer that contains only nitrogen (N) and potassium (K), such as 15-0-15.

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The phosphorus and potassium levels are high; therefore, no phosphorus (P) or potassium (K) fertilizers are needed. Apply only a nitrogen-containing fertilizer, such as 34-0-0 or 46-0-0.

Fact Sheet:

Trailing or Semi-erect Blackberries (6 to 8 feet apart):

Brambles do best when fertilized twice a year. About a month after planting, sprinkle 1/6 cup of 10-10-10 fertilizer in a 24-inch circle around each plant. In June, sprinkle 1/4 cup of 10-10-10 fertilizer over a 30-inch circle. These two applications should satisfy the fertilizer needs of the plants for the first year.

The nutritional needs of the plants in the second year should be supplied as follows:

  1. In early March sprinkle one cup of 10-10-10 fertilizer over a five-foot circle around each plant.
  2. In June sprinkle one cup of 10-10-10 fertilizer over the same five-foot circle around each plant.

Fertilization in succeeding years should be as follows:

  1. In early March sprinkle two cups of 10-10-10 fertilizer over a six-foot circle around each plant.
  2. In June sprinkle one cup of 10-10-10 fertilizer over the same six-foot circle around each plant. If new cane growth is excessive (over 12 feet for individual canes), omit this application.

Hedgerow Planting of Erect Blackberries:

During the year of establishment, fertilize the planting in March, June, and August (if needed). Apply 4½ pounds of 10-10-10 fertilizer per 100 foot of row at each application. This fertilizer should be sprinkled evenly over a 2-foot wide band where the plants or root cuttings are planted.

Fertilization the second year and thereafter should consist of two applications annually. Apply 11 pounds of 10-10-10 fertilizer per 100 feet of row over a 3-foot wide band in early March. In June, apply 5½ pounds of 10-10-10 fertilizer per 100 feet of row evenly over a 3-foot wide band.


Note 1: A pint of 10-10-10 fertilizer weighs approximately 1 pound; 3/4 pint of limestone weighs approximately 1 pound.

Note 2: On soils testing high in phosphorus and potassium, substitute 34-0-0 for 10-10-10 at one-third the rate or 46-0-0 at one-fourth the rate.