Nutrients

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

Apples - Chlorosis

Symptoms
Leaf growth is reduced and leaves are pale green / yellow in colour. Chlorotic leaves eventually develop necrotic blotches near the margin. Symptoms start at younger leaves.

Reasons
Sulphur deficiency Nitrogen deficiency can produce similar symptoms but starts at older leaves.

Sulphur deficiency made worse by

  • Acidic soils
  • Light, sandy soils (leaching)
  • Low organic matter
  • Poorly aerated soils (waterlogged soils
  • ) Areas with low industrial emissions

Sulfur is important for

  • New growth healthy and green
  • Fruit number and size increased
  • Overall yield is greater