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
Adapted from Maynard, D.N., and G.J. Hochmuth.2007. KnottŐs Handbook for Vegetable Growers. 5th edition.John Wiley & Sons, Inc. New York.