Nutrients

N Nitrogen
P Phosphorus
K Potassium
Mg Magnesium
Ca Calcium
S Sulfur
B Boron
Cu Copper
Fe Iron
Mn Manganese
Mo Molybdenum
Zn Zinc

Potatoes - Deformation

Symptoms
Shoots are upright and thin with dull, dark green leaves. Margins of leaves are cupped upward. Growth is stunted.

Reasons
Phosphorus deficiency (left).

Potatoes - Growth retardation

Symptoms
Lateral root development is inhibited. Tuber yield will be reduced.

Reasons
Phosphorus deficiency (right).

Potatoes - Deformation

Symptoms
Shoots are upright and thin with dull, dark green leaves. Bottom leaves show a dirty, dark blush and bend down. Stems also display a dark discoloration at the bottom. Growth is severely stunted.

Reasons
Phosphorus deficiency.

Potatoes - Deformation

Symptoms
Shoots are upright and thin with dull, dark green leaves. Bottom leaves show a dirty, dark blush and bend down. Stems also display a dark discoloration at the bottom. Growth is severely stunted.

Reasons
Phosphorus deficiency (right).

Potatoes - Discolouration

Symptoms
Shoots are upright and thin with dull, dark green leaves. Bottom leaves show a dirty, dark blush and bend down. Stems also display a dark discoloration at the bottom. Growth is severely stunted.

Reasons
Phosphorus deficiency.

Potatoes - Discolouration

Symptoms
Shoots are upright and thin with dull, dark green leaves. Bottom leaves show a dirty, dark blush and bend down. Stems also display a dark discoloration at the bottom. Growth is severely stunted.

Reasons
Phosphorus deficiency.

Phosphorus deficiency made worse by

  • Acidic or very alkaline (calcareaus) soils
  • Low organic matter
  • Cold or wet conditions
  • Crops with a poorly developed root system
  • Soils with low P reserves
  • Soils with a high phosphate capacity
  • Iron rich soils

Phosphorus is important for

  • Increased number of tubers
  • Produces tubers of uniform size
  • Boosts bulking and increases the yield of tubers
  • Increases tuber dry matter content and starch levels
  • Improves storage potential of tubers and reduces storage diseases

Yara recommended fertilizers for Phosphorus

YaraMila™ UNIK™ 16

YaraMila™ UNIK™ 16

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Read more about YaraMila™ UNIK™ 16

YaraMila™ GROWER™

YaraMila™ GROWER™

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Read more about YaraMila™ GROWER™