Nutrients

N Nitrogen
P Phosphorus
K Potassium
Mg Magnesium
Ca Calcium
S Sulfur
B Boron
Cu Copper
Fe Iron
Mn Manganese
Mo Molybdenum
Zn Zinc

Lettuce - Chlorosis

Symptoms
Generally iron deficiency does not decrease growth of lettuce. Only inner leaves are affected, because symptoms of iron deficiency always start on youngest leaves. They show yellow green, later lemon yellow and pale yellow interveinal chlorosis. Main veins still remain green. With strong deficiency veins become chlorotic, too and necrotic areas appear near leaf margin. Only severe deficiency produces symptoms on older leaves. Potentially brown necrosis turns up on margins of chlorotic leaves and spreads over whole leaves.

Reasons
Iron deficiency

Lettuce - Chlorosis

Symptoms
Symptoms of iron deficiency always start on youngest leaves. They show yellow green, later lemon yellow and pale yellow interveinal chlorosis. Main veins still remain green. With strong deficiency veins become chlorotic, too and necrotic areas appear near leaf margin. Only severe deficiency produces symptoms on older leaves. Roots are short and brownish. Very many secondary roots arise.

Reasons
Iron deficiency

Lettuce - Discolouration

Symptoms
With iron deficiency roots are shorter than normal. They show brownish discoloration. Furthermore very many secondary roots arise.

Reasons
Iron deficiency on roots

Iron deficiency made worse by

  • High pH
  • Water logged soils
  • Calcareous soils
  • High copper, manganese or zinc soils

Iron is important for

  • Essential for photosynthesis and plant metabolism
  • Thus important for early leaf development, strong growth and crop productivity