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



Potatoes: To stimulate early growth: 5 l/ha one week after 100 percent crop emergence. To increase tuber number: 10 l/ha at tuber initiation (when 50 percent at the tip swellings are twice the diameter of the rest of the stolon). To increase tuber size: a minimum of 2 applications of 5 l/ha or 1 to 2 applications of 10 l/ha during tuber bulking ( as soon as first formed tubers are 10mm in diameter) and following petiole analysis during tuber bulking. Allow 10 to 14 days between applications. Water rate: 200 l/ha.

Read more about YaraVita MAGPHOS K



Potatoes: For specific rates and timing contact your local Yara stockist.

Read more about YaraMila COMPLEX

Other recommended products