Nutrients

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

Cocoa - Chlorosis

Symptoms
Young leaves develop pale yellow interveinal areas which may become completely white when deficiency is severe. Veins remain dark green for some time. Older leaves often remain green.

Reasons
Iron deficiency. Fe deficiency in the soil is likely on alkaline and calcareous soils, since availability decreases with increasing soil pH. Leaf nutrient concentration of 60 - 200 ppm Fe is considered as adequate.

Cocoa - Chlorosis

Symptoms
Young leaves develop pale yellow interveinal areas which may become completely white when deficiency is severe. Veins remain dark green for some time. Older leaves often remain green.

Reasons
Iron deficiency. Fe deficiency in the soil is likely on alkaline and calcareous soils, since availability decreases with increasing soil pH. Leaf nutrient concentration of 60 - 200 ppm Fe is considered as adequate.

Cocoa - Chlorosis

Symptoms
Young leaves develop pale yellow interveinal areas which may become completely white when deficiency is severe. Veins remain dark green for some time. Older leaves often remain green.

Reasons
Iron deficiency. Fe deficiency in the soil is likely on alkaline and calcareous soils, since availability decreases with increasing soil pH. Leaf nutrient concentration of 60 - 200 ppm Fe is considered as adequate.

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 with healthy leaves and crop productivity