Potatoes - Chlorosis
Symptoms
The pale green/yellow leaves (left) are reduced in size and growth may be stunted. Often seen on younger leaves first.
Causes
Severe Sulphur deficiency.
Nitrogen deficiency, nightfrosts, water shortage or heavy metal toxicity can cause similar symptoms.
May occur in patches due to soil type.
Potatoes - Growth retardation
Symptoms
The pale green leaves (left) are reduced in size and growth is stunted. Symptoms often seen on younger leaves first.
Causes
Sulphur deficiency.
Nitrogen deficiency, nightfrosts, water shortage or heavy metal toxicity can cause similar symptoms.
Potatoes - Chlorosis
Symptoms
The entire foliage - beginning at the younger leaves - turns pale green. Additionally, a purple tint may occur on stems, leaf stalks and leaf edges. The veins are often lighter than blade.
Causes
Sulphur deficiency.
Nitrogen deficiency, nightfrosts, water shortage or heavy metal toxicity can cause similar symptoms.
Potatoes - Chlorosis
Symptoms
Symptoms start on young leaves. They are pale yellow and smaller than normal. The youngest leaves are bright yellow.
Causes
Sulphur deficiency on leaves
Nitrogen deficiency produces similar symptoms but starts on 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
Sulphur is important for
- Better crop development
- Improved yield
Yara recommended fertilisers for Sulphur deficiency
YaraVita THIOTRAC 300
Potatoes: 5 l/ha one week after 100% emergence. Repeat applications may be necessary at 10 to 14 day intervals. Also, 5 l/ha following petiole analysis during tuber bulking. Water rate: 200 l/ha.
Read more about YaraVita THIOTRAC 300
