Symptoms
Older Leaves show a yellow to brown, well defined border zone.
With ongoing deficiency necrosis progresses from the margins to the middle.
Reasons
Potassium deficiency
Brassicas have a relatively high K-requirement lasting through head formation and enlargement. Good K supply results in a more consistent, marketable crop with better inner and outer quality.
Broccoli - Chlorosis
Symptoms
Older Leaves show a yellow to brown necrotic, well defined border zone.
With ongoing deficiency necrosis progresses from the margins to the middle.
Reasons
Potassium deficiency
Brassicas have a relatively high K-requirement lasting through head formation and enlargement. Good K supply results in a more consistent, marketable crop with better inner and outer quality.
Broccoli - Size reduced
Symptoms
Older Leaves show a yellow to brown necrotic, well defined border zone. With ongoing deficiency chlorosis and subsequent necrosis progress from the margins to the middle.
Growth is severely stunted.
Reasons
Potassium deficiency
Brassicas have a relatively high K-requirement lasting through head formation and enlargement. Good K supply results in a more consistent, marketable crop with better inner and outer quality.
Broccoli - Size reduced
Symptoms
Older Leaves show a yellow to brown necrotic, well defined border zone. With ongoing deficiency chlorosis and subsequent necrosis progress from the margins to the middle.
Growth is severely stunted.
Reasons
Potassium deficiency
Brassicas have a relatively high K-requirement lasting through head formation and enlargement. Good K supply results in a more consistent, marketable crop with better inner and outer quality.
Broccoli - Chlorosis
Symptoms
Older Leaves show a yellow to brown necrotic, well defined border zone.
With ongoing deficiency necrosis progresses from the margins to the middle.
Reasons
Potassium deficiency
Brassicas have a relatively high K-requirement lasting through head formation and enlargement. Good K supply results in a more consistent, marketable crop with better inner and outer quality.
Broccoli - Chlorosis
Symptoms
Older Leaves show a yellow to brown necrotic, well defined border zone.
With ongoing deficiency necrosis progresses from the margins to the middle.
Reasons
Potassium deficiency (right)
Brassicas have a relatively high K-requirement lasting through head formation and enlargement. Good K supply results in a more consistent, marketable crop with better inner and outer quality.
Broccoli - Size reduced
Symptoms
Older Leaves show a yellow to brown necrotic, well defined border zone. With ongoing deficiency chlorosis and subsequent necrosis progress from the margins to the middle.
Growth is severely stunted.
Reasons
Potassium deficiency (right)
Brassicas have a relatively high K-requirement lasting through head formation and enlargement. Good K supply results in a more consistent, marketable crop with better inner and outer quality.
Potassium deficiency made worse by
Acidic soils (low pH)
Sandy or light soils (leaching)
Drought conditions
High rainfall (leaching)
or heavy irrigation
Heavy clay (illite) soils
Soils with low K reserves
Magnesium rich soils
Potassium is important for
Resistance to cold injury and drought
High yields through increased biomass and head weight
Consistent, early and evenly matured marketable crop