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Micronutrients

Micronutrient Functions in Plants

Factors That Influence Micronutrients Availability


Mobility of Micronutrients in Plants

  • Mobile (symptoms appear in older tissue): Cl, Mo
  • Immobile (symptoms appear in younger tissue): Fe, Zn, Cu, Mn, B, Ni

Mobility of Micronutrients in Soils

  • Mobile (leachable): Cl, B
  • Immobile: Zn, Fe, Cu, Mn, Mo

Iron (Fe)

Iron Deficiency in Plants

  • Young leaves develop inter-veinal chlorosis, progresses over the entire leaf
  • Chelate dynamics increases Fe availability

Toxicity could happen in poorly drained soils

Wheat Example

Canola Example

Example of Iron deficiency in wheat
Second example of Iron deficiency in wheat
Example of Iron deficiency in canola

Zinc (Zn)

Zn Deficiency in Plants

  • Yellow or white areas between leaf veins
  • Reduced tillering
  • Shortening of stem or stalk internodes, bushy, rosetted leaves
  • Small, narrow, thickened leaves, malformed by growth of only part of leaf tissue
  • Premature foliage loss
  • Malformation of fruit

Wheat Examples

Example of Zinc deficiency in wheat
Second example of Zinc deficiency in wheat

Manganese (Mn)

Mn Deficiency in Plants

  • Interveinal chlorosis, start from younger leaves
  • Reduced root and shoot growth rate
  • Increases potential for root and leaf diseases

Wheat Examples

Example of Manganese deficiency in wheat
Second example of Manganese deficiency in wheat

Chloride (Cl)

Cl Deficiency in Plants

  • Chlorosis in younger leaves and overall wilting
  • Chlorotic lesions on leaves (physiologic leaf spot)

Wheat Examples

(photos courtesy of R. Koenig)
Example of Chloride deficiency in wheat
Second example of Chloride deficiency in wheat

Copper (Cu)

Cu Deficiency in Plants

  • Chlorosis (leaf spot) in young leaves
  • Young leaves become yellow and stunted
  • Lodging, wilting
  • Increased disease

Wheat Examples

Example of Copper deficiency in wheat
Second example of Copper deficiency in wheat

Cu Toxicity Symptoms

  • Reduced shoot vigor
  • Poorly developed and discolored root systems
  • Leaf chlorosis

Boron (B)

B Deficiency in Plants

  • Yield reduction in small grains, poor pollination, grain set and fill
  • Thickened, wilted, or curled leaves
  • Thickened, cracked, water-soaked petioles and stems
  • Darkened, cracking, rotting fruits or roots: brown heart, black heart, hollow-hart in peanut

Wheat Examples

Canola Examples

Example of Boron deficiency in wheat
Second example of Boron deficiency in wheat
Second example of Boron deficiency in canola
Second example of Boron deficiency in canola

Molybdenum (Mo)

  • Legumes (such as Soybeans, Alfalfa, Clover) need Mo for nodule formation

Wheat Example

Example of Molybdenum deficiency in wheat
Washington State University