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Nitrogen Deficiency Nitrogen is a mobile element. Symptoms of nitrogen deficiency will appear first on the oldest leaves, and as the deficiency becomes more severe, will later appear on the younger leaves.
Expected symptoms include:
Leaves turn lighter green, then yellow and chlorotic
Loss of mass and stunting
Leaf necrosis in advanced stages
Early symptoms of nitrogen deficiency are exhibited as chlorosis in the oldest (lowest) leaves.
Healthy, nitrogen-supplied plant.
Nitrogen-deficient mature lettuce is stunted and generally chlorotic overall.