Sweet corn nutrient sufficiency ranges
| Plant Part | Time of Sampling | N | P | K | Ca | Mg | S | Fe | Mn | Zn | B | Cu |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Percent (%) | Parts per Million (ppm) | |||||||||||
| Whole seedlings | 3-leaf stage | 3-4 | 0.35-0.5 | 2.5-4 | 0.6-0.8 | 0.25-0.5 | 0.4-0.6 | 50-100 | 40-100 | 30-40 | 10-30 | 5-10 |
| 6-leaf stage | 3-4 | 0.25-0.5 | 2.5-4 | 0.5-0.8 | 0.25-0.5 | 0.4-0.6 | ||||||
| Most recently mature leaf | 75 cm (30 in.) tall | 2.5-4 | 0.2-0.4 | 2.5-4 | 0.5-0.8 | 0.2-0.4 | 0.2-0.4 | 40-100 | 40-100 | 25-40 | 10-30 | 4-10 |
| Just prior to tassle | 2.5-4 | 0.2-0.4 | 2-3.5 | 0.3-0.6 | 0.15-0.4 | 0.2-0.4 | 30-100 | 20-100 | 20-40 | 10-20 | 4-10 | |
| Ear leaf | Tasselling | 1.5-2.5 | 0.2-0.4 | 1.2-2 | 0.3-0.6 | 0.15-0.4 | 0.2-0.4 | 30-100 | 20-100 | 20-40 | 10-20 | 4-10 |
| 1 The sufficiency ranges provided are to be used as a reference and a guideline only. | ||||||||||||
| Adapted from Maynard, D.N., and G.J. Hochmuth. 2007. Knott’s Handbook for Vegetable Growers. 5th edition. John Wiley & Sons, Inc. New York. | ||||||||||||