Potatoes - Chlorosis
Symptoms
Plants (right) are stunted and leaves show a uniform chlorotic pale green / yellow colouration
Reasons
Nitrogen deficiency
Sulphur deficiency, root parasites (eg PCN), deep drilling of tubers, nightfrosts, water shortage or heavy metal toxicity can cause similar symptoms.
Potatoes - Chlorosis
Symptoms
Leaves (right) are stunted and leaves show a uniform chlorotic pale green/yellow colouration
Reasons
Nitrogen deficiency
Sulphur deficiency, root parasites (eg PCN), deep drilling of tubers, nightfrosts, water shortage or heavy metal toxicity can cause similar symptoms.
Potatoes - Growth retardation
Symptoms
Plants on the left side show uniform pale green leaves and stunted growth. Older leaves usually affected first and these then turn yellow and shed early.
Reasons
Nitrogen deficiency.
Sulphur deficiency, root parasites (eg PCN), deep drilling of tubers, nightfrosts, water shortage or heavy metal toxicity can cause similar symptoms.
Often seen as patches due to poor fertiliser application or soil type
Nitrogen deficiency made worse by
- Low or high pH soils
- Sandy or light soils (leaching
- ) Low organic matter
- Drought conditions
- High rainfall (leaching) or heavy irrigation
- Addition or high levels of non-decomposed organic matter/manure (eg straw)
- Fast growing crops
Nitrogen is important for
- Better crop development
- Improved yield
Yara recommended fertilizers for Nitrogen
YaraLiva TROPICOTE
Potatoes: 375 to 500 kg/ha at tuber initiation. Exact recommendation depends on soil analysis and variety requirements. Refer to your local Yara area manager for detailed recommendation.
Read more about YaraLiva TROPICOTEYaraVita CROPLIFT PRO
Potatoes: 2.5 to 5 kg/ha. Repeat at 10 to 14 day intervals as necessary. Water rate: 200 l/ha.
Read more about YaraVita CROPLIFT PROYaraVita SAFE-N 300
Potatoes: 10 to 20 l/ha before tuber set and at onset of flowering. Also, apply 10 to 20 l/ha, if required, following petiole analysis. Water rate: 100 to 200 l/ha.
Read more about YaraVita SAFE-N 300CHAFER NUFOL 20
Potatoes: Suitable for foliar application. Apply up to 2x25 l/ha from early to mid tuber bulking. Refer to your local Yara area manager for detailed recommendation.
Read more about CHAFER NUFOL 20
