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Plant Part: Uppermost recently mature leaf blades
Sampling Procedure: Collect leaves from at least 25 to 30 plants.Collect one leaf per plant.Start from the top of the plant and collect the most recently expanded, fully mature leaf.
| Analysis | Tissue Concentration Guidelines | |||||||
| Low/Marginal Range | Sufficiency Range | Excessive, toxic? | ||||||
| Nitrogen, % N | 3.00 | - | 3.50 | 3.50 | - | 8.00 | ||
| Phosphorus, %P | 0.20 | - | 0.25 | 0.25 | - | 0.60 | ||
| Potassium, % K | 2.20 | - | 2.50 | 2.50 | - | 6.60 | ||
| Calcium, % Ca | 0.90 | - | 1.00 | 1.00 | - | 3.20 | ||
| Magnesium, % Mg | 0.20 | - | 0.28 | 0.28 | - | 0.85 | ||
| Sulfur, % S | 0.50 | - | 0.60 | 0.60 | - | 2.00 | ||
| Zinc, ppm Zn | 25 | - | 30 | 30 | - | 120 | ||
| Iron, ppm Fe | 40 | - | 50 | 50 | - | 500 | ||
| Manganese, ppm Mn | 20 | - | 25 | 25 | - | 200 | ||
| Copper ppm Cu | 4 | - | 5 | 5 | - | 25 | ||
| Boron, ppm B | 15 | - | 20 | 20 | - | 55 | ||
| Nitrogen-to-sulfur ratio (N:S) | n/a | n/a | ||||||
| Sodium, % Na | n/a | n/a | ||||||
| Chloride, % Cl | n/a | n/a | ||||||