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¶ Durum wheat (Triticum durum)
¶ A: Boot to head emergence (Feekes stage 10 to 10.1)
Plant Part: Whole stems
Sampling Procedure: Collect 25 to 30 whole stems (tillers), cutting off about ½ inch above ground level. At least a pint of loosely packed tissue should be submitted for analysis. Place sample in a paper bag, not a plastic bag, for shipment to the laboratory.
| Analysis | Tissue Concentration Guidelines | |||||||
| Low/Marginal Range | Sufficiency Range | Excessive, toxic? | ||||||
| Nitrogen, % N | 1.80 | - | 2.30 | 2.30 | - | 2.80 | ||
| Phosphorus, %P | 0.15 | - | 0.20 | 0.20 | - | 0.40 | ||
| Potassium, % K | 1.20 | - | 1.50 | 1.50 | - | 3.00 | ||
| Calcium, % Ca | 0.15 | - | 0.20 | 0.20 | - | 0.70 | ||
| Magnesium, % Mg | 0.10 | - | 0.15 | 0.15 | - | 0.50 | ||
| Sulfur, % S | 0.10 | - | 0.15 | 0.15 | - | 0.40 | ||
| Zinc, ppm Zn | 10 | - | 15 | 15 | - | 70 | ||
| Iron, ppm Fe | 20 | - | 25 | 25 | - | 250 | 500 | |
| Manganese, ppm Mn | 5 | - | 20 | 20 | - | 100 | 250 | |
| Copper ppm Cu | 2 | - | 5 | 5 | - | 15 | ||
| Boron, ppm B | 2 | - | 5 | 5 | - | 20 | ||
| Nitrogen-to-sulfur ratio (N:S) | 15 | - | 20 | 10 | - | 15 | ||
| Sodium, % Na | - | - | ||||||
| Chloride, % Cl | - | - | ||||||
¶ Figure A.
