Symptoms
Characteristic symptoms of N deficiency are reduced vigor, smaller leaves and a pale green or yellowish leaf color.
The symptoms first become visible on the old leaves which turn yellow and wither at progressing deficiency. Necrosis starts on the leaf tip and progresses toward the leaf base.
Extreme N deficiency causes early senescence and diminished ear size.
Reasons
Nitrogen deficiency(bottom)
Sulphur deficiency, low pH and root damage cause similar symptoms.
Symptoms of N and S deficiency in wheat and other small grains are very similar, thus a tissue analysis is often necessary to reveal the cause.