Nitrogen deficiency-Potatoes

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

YaraMila COMPLEX

potatoes: Applying 500-700 Kg/ha pre-plant or placed at least 8cm away from seed tubers at planting. Apply/Spread 300-350 Kg/ha at Hilling up/Tuber initiation. Refer to Yara crop program @ www.yara.com.au as a guide or contact your local Yara sales agronomist for advice.

YaraLiva NITRABOR

Potatoes: Spread 150-200 Kg/ha before Hilling up. Contact your local Yara sales agronomist for advice.

UNIKA CALCIUM

Potatoes: Spread 200-250 Kg/ha at Tuber Initiation. Refer to Yara crop program @ www.yara.com.au as a guide or contact your local Yara sales agronomist for advice.