⇦ Back to Soil Fertility and Plant Nutrition Home
¶ Oats (Avena sativa)
| Table No: | Growth stage: | Plant part: |
| Table A | Emergence to tillering (Feekes 1 to 4) | Whole plant |
| Table B | Stem extension, jointing (Feekes 5 to 7) | Whole tillers |
| Table C | Pre-boot (Feekes stage 8 to 9) | Whole stems |
| Table D | Boot to head emergence (Feekes stage 10 to 10.1) | Whole stems |
| Table E | Flowering (Feekes stage 10.5.1 to 10.5.4) | Whole stems |
| Table F | Grainfill to maturity | Whole stems |
¶ A: Emergence to Tillering (Feekes 1 to 4)
Plant Part: Whole plant
Sampling Procedure: Collect 30 to 40 tillers, cutting off about ½ inch above ground level. At least a pint of loosely packed tissue (a ball about 4 to 5 inches in diameter) 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 | 3.20 | - | 3.50 | 3.50 | - | 5.00 | ||
| Phosphorus, %P | 0.40 | - | 0.45 | 0.45 | - | 0.70 | ||
| Potassium, % K | 3.00 | - | 3.40 | 3.40 | - | 5.00 | ||
| Calcium, % Ca | 0.15 | - | 0.20 | 0.20 | - | 0.50 | ||
| Magnesium, % Mg | 0.09 | - | 0.12 | 0.15 | - | 0.50 | ||
| Sulfur, % S | 0.20 | - | 0.25 | 0.25 | - | 0.50 | ||
| Zinc, ppm Zn | 10 | - | 20 | 20 | - | 50 | ||
| Iron, ppm Fe | 20 | - | 25 | 25 | - | 500 | ||
| Manganese, ppm Mn | 12 | - | 25 | 25 | - | 100 | ||
| Copper ppm Cu | 3 | - | 5 | 5 | - | 10 | ||
| Boron, ppm B | 3 | - | 5 | 5 | - | 10 | ||
| Nitrogen-to-sulfur ratio (N:S) | 15 | - | 25 | 10 | - | 15 | ||
| Sodium, % Na | n/a | n/a | ||||||
| Chloride, % Cl | n/a | n/a | ||||||
¶ Figure A.
¶ B: Jointing (Feekes 5 to 7)
Plant Part: Whole tillers
Sampling Procedure: Collect 30 to 40 tillers, cutting off about ½ inch above ground level. At least a pint of loosely packed tissue (a ball about 4 to 5 inches in diameter) 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 | 2.00 | - | 2.50 | 2.50 | - | 3.50 | ||
| Phosphorus, %P | 0.35 | - | 0.40 | 0.40 | - | 0.60 | ||
| Potassium, % K | 2.50 | - | 3.00 | 3.00 | - | 4.50 | ||
| Calcium, % Ca | 0.15 | - | 0.20 | 0.20 | - | 0.50 | ||
| Magnesium, % Mg | 0.10 | - | 0.15 | 0.15 | - | 0.50 | ||
| Sulfur, % S | 0.20 | - | 0.25 | 0.25 | - | 0.50 | ||
| Zinc, ppm Zn | 10 | - | 20 | 20 | - | 50 | ||
| Iron, ppm Fe | 20 | - | 25 | 25 | - | 500 | ||
| Manganese, ppm Mn | 15 | - | 25 | 25 | - | 150 | ||
| Copper ppm Cu | 3 | - | 5 | 5 | - | 10 | ||
| Boron, ppm B | 3 | - | 5 | 5 | - | 10 | ||
| Nitrogen-to-sulfur ratio (N:S) | 15 | - | 25 | 10 | - | 15 | ||
| Sodium, % Na | n/a | n/a | ||||||
| Chloride, % Cl | n/a | n/a | ||||||
¶ Figure B.
¶ C: Pre-boot (Feekes stage 8 to 9)
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 | - | 4.00 | ||
| Phosphorus, %P | 0.30 | - | 0.35 | 0.35 | - | 0.60 | ||
| Potassium, % K | 1.80 | - | 2.30 | 2.30 | - | 4.00 | ||
| Calcium, % Ca | 0.15 | - | 0.20 | 0.20 | - | 0.50 | ||
| Magnesium, % Mg | 0.10 | - | 0.15 | 0.15 | - | 0.50 | ||
| Sulfur, % S | 0.15 | - | 0.25 | 0.25 | - | 0.50 | ||
| Zinc, ppm Zn | 10 | - | 20 | 20 | - | 50 | ||
| Iron, ppm Fe | 20 | - | 25 | 25 | - | 500 | ||
| Manganese, ppm Mn | 15 | - | 25 | 25 | - | 150 | ||
| Copper ppm Cu | 3 | - | 5 | 5 | - | 15 | ||
| Boron, ppm B | 3 | - | 5 | 5 | - | 10 | ||
| Nitrogen-to-sulfur ratio (N:S) | 15 | - | 25 | 10 | - | 15 | ||
| Sodium, % Na | n/a | n/a | ||||||
| Chloride, % Cl | n/a | n/a | ||||||
¶ Figure C.
¶ D: Boot to head emergence (Feekes stage 10 to 10.1)
Plant Part: Whole stems
Sampling Procedure: Collect 30 to 40 tillers, cutting off about ½ inch above ground level. At least a pint of loosely packed tissue (a ball about 4 to 5 inches in diameter) 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 | 1.50 | - | 2.00 | 2.00 | - | 3.00 | ||
| Phosphorus, %P | 0.25 | - | 0.30 | 0.30 | - | 0.50 | ||
| Potassium, % K | 1.30 | - | 1.50 | 1.50 | - | 2.50 | ||
| Calcium, % Ca | 0.15 | - | 0.20 | 0.20 | - | 0.50 | ||
| Magnesium, % Mg | 0.10 | - | 0.15 | 0.15 | - | 0.50 | ||
| Sulfur, % S | 0.15 | - | 0.20 | 0.25 | - | 0.50 | ||
| Zinc, ppm Zn | 10 | - | 15 | 15 | - | 50 | ||
| Iron, ppm Fe | 20 | - | 25 | 25 | - | 500 | ||
| Manganese, ppm Mn | 15 | - | 25 | 25 | - | 150 | ||
| Copper ppm Cu | 3 | - | 5 | 5 | - | 15 | ||
| Boron, ppm B | 3 | - | 5 | 5 | - | 10 | ||
| Nitrogen-to-sulfur ratio (N:S) | 15 | - | 25 | 10 | - | 15 | ||
| Sodium, % Na | n/a | n/a | ||||||
| Chloride, % Cl | n/a | n/a | ||||||
¶ Figure D.
¶ E: Flowering (Feekes stage 10.5.1 to 10.5.4)
Plant Part: Whole plant
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 | 1.50 | - | 2.00 | 2.00 | - | 3.00 | ||
| Phosphorus, %P | 0.20 | - | 0.25 | 0.25 | - | 0.40 | ||
| Potassium, % K | 1.30 | - | 1.50 | 1.50 | - | 2.50 | ||
| Calcium, % Ca | 0.15 | - | 0.17 | 0.17 | - | 0.50 | ||
| Magnesium, % Mg | 0.10 | - | 0.15 | 0.15 | - | 0.50 | ||
| Sulfur, % S | 0.15 | - | 0.20 | 0.20 | - | 0.50 | ||
| Zinc, ppm Zn | 10 | - | 15 | 15 | - | 50 | ||
| Iron, ppm Fe | 20 | - | 25 | 25 | - | 500 | ||
| Manganese, ppm Mn | 15 | - | 25 | 25 | - | 150 | ||
| Copper ppm Cu | 3 | - | 5 | 5 | - | 15 | ||
| Boron, ppm B | 3 | - | 5 | 5 | - | 10 | ||
| Nitrogen-to-sulfur ratio (N:S) | 15 | - | 25 | 10 | - | 15 | ||
| Sodium, % Na | n/a | n/a | ||||||
| Chloride, % Cl | n/a | n/a | ||||||
¶ Figure E.
¶ F: Grainfill to maturity
Plant Part: Whole plant
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 | - | - | ||||||
| Phosphorus, %P | - | - | ||||||
| Potassium, % K | - | - | ||||||
| Calcium, % Ca | - | - | ||||||
| Magnesium, % Mg | - | - | ||||||
| Sulfur, % S | - | - | ||||||
| Zinc, ppm Zn | - | - | ||||||
| Iron, ppm Fe | - | - | ||||||
| Manganese, ppm Mn | - | - | ||||||
| Copper ppm Cu | - | - | ||||||
| Boron, ppm B | - | - | ||||||
| Nitrogen-to-sulfur ratio (N:S) | - | - | ||||||
| Sodium, % Na | n/a | n/a | ||||||
| Chloride, % Cl | n/a | n/a | ||||||
Note: During plant maturity, nutrients may be translocated from the leaf tissues to the reproductive tissues (grain, seeds, fruit, etc.) and may be quite variable. The interpretations provided above are best estimates of nutrient content.