M A C R O |
Element / Form |
Action in Plant |
Deficiency Symptom |
| NITROGEN |
Gives dark green color, induces rapid growth, increases protein content, and gives crisp leaf quality. |
Yellowing, then dropping of older leaves, small leaves, or stunted growth. |
| PHOSPHORUS |
Promotes root development, flowering, seed formation, and hastens maturity. |
Purple edges to leaves, delays fruit maturity, die back on leaf tips, and early defoliation. |
| POTASSIUM |
Increases vigor, disease resistance, cell turgidity, and ability to take-up water. |
Mottling or curling, green mid-rib, and yellowing at the tips or margins of older leaves. Plant lodges easily. |
|
M I C R O N U T R I E N T S |
SULFUR |
Corrects for high soil pH. Essential in plants for protein formation, root growth, and seed production. |
Young leaves general yellowing but not along the mid-rib. Stalks short and slender. |
| IRON |
Essential to chlorophyll production, enzyme formation and protein synthesis. |
Chlorosis in young leaves, most veins remaning green. |
| MAGNESIUM |
A component of chlorophyll and aids in the translocation of phosphorus. |
Older leaves light green, mottled with dead spots. |
| ZINC |
Used for enzyme production, protein synthesis, and seed and growth hormone formation. |
Mottled leaves with interveinial chlorosis, and white appearance to buds. |
| MANGANESE |
Used by plants for photosynthesis, respiration, and certain nitrogen transformations. |
Yellowing of leaves, small veins green, and dead spots scattered over entire leaf. |
| BORON |
Used by plants to control the rate of water absorption, cell division, and sugar translocation. |
Rosetting effect or death of the terminal bud, fruits, flowers, and root tips. |
| COPPER |
Used by plants for respiration, photosynthesis, nitrogen fixation, and the utilization of iron. |
Permanent wilting of young leaves and weak stalks. |
| MOLYBDENUM |
Used by plants for nitrogen fixation and the activation of enzymes. |
Interveinial chlorosis in leaves and plant becomes stunted. |
| CALCIUM |
Promotes early root formation and growth. Also improves plant vigor. |
Death of terminal bud and leaves have wrinkled appearance along the margins. |