⇦ Back to Soil Fertility and Plant Nutrition Home
¶ Blackberry (Rubus species)
¶ A: Post-harvest primocane
Plant Part: Most recently matured leaves without petioles.
Sampling Procedure: Collect 30 to 60 of the most recently mature leaves from mid-section of the primocane (first year, non-fruiting growth) about two weeks after berry harvest (normally in August). Mid-section leaves are usually the third to the fifth set of leaves back from the growing point or bud. Discard petioles, keep the leaf blades.
| Analysis | Tissue Concentration Guidelines | ||||||||
| Low/Marginal Range | Sufficiency Range | Excessive, toxic? | |||||||
| Nitrogen, % N | 2.20 | - | 2.40 | 2.40 | - | 3.00 | |||
| Phosphorus, %P | 0.15 | - | 0.17 | 0.17 | - | 0.25 | |||
| Potassium, % K | 0.60 | - | 0.70 | 0.70 | - | 2.00 | |||
| Calcium, % Ca | 0.45 | - | 0.50 | 0.50 | - | 1.00 | |||
| Magnesium, % Mg | 0.25 | - | 0.30 | 0.30 | - | 0.50 | |||
| Sulfur, % S | 0.11 | - | 0.13 | 0.13 | - | 0.25 | |||
| Zinc, ppm Zn | 15 | - | 20 | 20 | - | 40 | >200 | ||
| Iron, ppm Fe | 40 | - | 50 | 50 | - | 200 | >800 | ||
| Manganese, ppm Mn | 40 | - | 50 | 50 | - | 300 | >500 | ||
| Copper ppm Cu | 5 | - | 7 | 7 | - | 20 | >200 | ||
| Boron, ppm B | 25 | - | 30 | 30 | - | 50 | >150 | ||
| Sodium, % Na | 0.05 | 0.50 | |||||||
| Chloride, % Cl | 0.05 | 0.20 | 0.5 | - | 2.0 | ||||
¶ Figure A.
