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
YaraVita MAGPHOS K
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.
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