Nutrient Deficiency Symptoms
Correct identification of nutrient deficiencies is an important first step in developing an effective plant nutrition program. Many cases of poor growth, leaf chlorosis, reduced yield and lower crop quality are associated with nutrient deficiencies or imbalances.
Understanding common deficiency symptoms can help growers make more informed decisions regarding crop nutrition and nutrient management.
Where Does Diagnosis Begin?
Nutrient deficiencies are often identified through visual symptoms on leaves, stems, flowers and fruits. However, accurate diagnosis should also consider soil conditions, irrigation water quality and, whenever possible, soil or tissue analysis.
Symptom Location:
A Key to Diagnosis
One of the simplest ways to identify nutrient deficiencies is to determine where symptoms first appear on the plant.
Mobile nutrients can be redistributed within the plant and their deficiencies usually appear first on older leaves.
Immobile nutrients have limited movement within the plant and deficiency symptoms typically develop on younger leaves and growing tissues.
Mobile Nutrients
Deficiency symptoms usually appear first on older leaves.
Nitrogen (N)
Phosphorus (P)
Potassium (K)
Magnesium (Mg)
Molybdenum (Mo)
Immobile Nutrients
Deficiency symptoms usually appear first on young leaves and growing points.
Iron (Fe)
Zinc (Zn)
Manganese (Mn)
Calcium (Ca)
Boron (B)
Copper (Cu)
Sulfur (S)
Common Macronutrient Deficiencies
Nitrogen (N)
- Location: Older leaves
- Key Symptom: Uniform yellowing and reduced plant vigor
- Common Conditions: Low organic matter and sandy soils
- Occurrence: Very Common
Phosphorus (P)
- Location: Older leaves
- Key Symptom: Dark green foliage with purple discoloration
- Common Conditions: Cold soils and high soil pH
- Occurrence: Common
Potassium (K)
- Location: Older leaves
- Key Symptom: Leaf margin yellowing and scorch
- Common Conditions: Sandy soils, drought and salinity
- Occurrence: Common
Magnesium (Mg)
- Location: Older leaves
- Key Symptom: Interveinal chlorosis while veins remain green
- Common Conditions: High potassium levels and sandy soils
- Occurrence: Common
Calcium (Ca)
- Location: Young leaves and growing tissues
- Key Symptom: Leaf distortion and tip burn
- Common Conditions: Rapid growth and moisture stress
- Occurrence: Common
Sulfur (S)
- Location: Young leaves
- Key Symptom: Uniform yellowing of new growth
- Common Conditions: Low organic matter and light soils
- Occurrence: Moderately Common
Common Micronutrient Deficiencies
Iron (Fe)
- Location: Young leaves
- Key Symptom: Interveinal chlorosis while veins remain green
- Common Conditions: Calcareous soils and high pH
- Occurrence: Very Common
Zinc (Zn)
- Location: Young leaves and shoots
- Key Symptom: Small leaves and shortened internodes
- Common Conditions: Calcareous soils and high phosphorus levels
- Occurrence: Very Common
Manganese (Mn)
- Location: Young leaves
- Key Symptom: Interveinal chlorosis with small necrotic spots
- Common Conditions: High pH and calcareous soils
- Occurrence: Common
Boron (B)
- Location: Growing points and young tissues
- Key Symptom: Growth cessation and leaf deformation
- Common Conditions: Drought and calcareous soils
- Occurrence: Common
Copper (Cu)
- Location: Young leaves and shoots
- Key Symptom: Leaf distortion and weak growth
- Common Conditions: Organic soils and high pH
- Occurrence: Less Common
Molybdenum (Mo)
- Location: Young to intermediate leaves
- Key Symptom: General chlorosis and reduced growth
- Common Conditions: Acidic soils
- Occurrence: Less Common
Improving Diagnostic Accuracy
Check Symptom Location
Mobile nutrients such as nitrogen, phosphorus, potassium and magnesium typically affect older leaves first, while deficiencies of iron, calcium and boron generally appear on younger tissues.
Young leaves
Older leaves
Compare Similar Symptoms
Several nutrient deficiencies may produce similar visual symptoms. Consider symptom location, crop conditions and analytical testing whenever possible to improve diagnostic accuracy.
