Symptoms of nitrogen deficiency in wheat

1
Symptoms of nitrogen deficiency in wheat

• Reduced tillering
• Reduced root mass
• Smaller leaf size
• Lower leaves turn yellow and died from the tip
  back
• Stunted growth and reduced tillering
• Adverse effect on spikelet formation, floret
  formation, kernel fill, and grain protein

2
Other causes of similar symptoms

• Drought injury
• Sulfur deficiency
• Barley yellow dwarf virus
• Wheat streak mosaic virus
• Herbicide injury due to
• Acetanilides (Stampede)
• Imidazolinone symptoms on leaf tips (Assert,
  Pursuit, Scepter)
• Sulfonylurea symptoms on leaf tips (Accent, Ally,
  Amber, Beacon, Classic, Express, Glean, Muster,
  Pinnacle, Refine)
• as-Triazines (Lexone, Sencor)
• s-Triazines (Aatrex, Atrazine, Bladex)

3
N deficiency conditions and patterns

• Favorable conditions
• Lack of available nitrogen due to excessively wet
  soils in the growing season.
• Drought, sandy soils, and soils low in organic
  matter
• Intensive cropping with insufficient nitrogen
• Pattern in field
• Nitrogen deficiency generally occurs in areas of
  soil compaction or high crop residue which may
  tie up available nitrogen early in the growing
  season
• Symptoms also can appear on sandy ridges, eroded
  hilltops and areas where water has accumulated
  and leached the nitrogen out of the root zone

http//scarab.msu.montana.edu/Disease/DiseaseGuide
html/webAbnutr.htm
4
Nitrogen deficiency

• Cool, wet weather the plant cant take N up from
  the soil, even if the N is available (when the
  temperature warms up, the plants will recover)
• Can look like a virus (Wheat streak), but more
  general chlorosis on leaves, look at the pattern

Nitrogen Wheat streak mosaic virus