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
- Essential for energy transfer within the plant, therefore direct effect on yield and quality
- Boosts yield and bulb size
- Helps ensuring top yields through use of high rates of N with little quality deterioration
Yara recommended fertilizers for Phosphorus
YaraVita® MAGPHOS™
Onions: 1-2 quarts/acre. Apply when the foliage is 6" tall, with repeat applications 10 to 14 day intervals if necessary. Water rate: 3 to 20 gallons/acre.
Read more about YaraVita® MAGPHOS™YaraVita® SENIPHOS™
Onions: 1 to 2 applications of 2 quarts/acre during bulb filling, with a 10 to 14 day interval between sprays. Water rate: 20 gallons/acre
Read more about YaraVita® SENIPHOS™NUTRA-PHOS CALZINC
Onion: 3 to 10 lb. per acre per application. Repeat as needed. Apply aerial applications in at least 5 gallons/acre and ground applications in at least 10 gallons/acre; however, when total application gallonage is 25 gallons per acre or less, DO NOT mix more than 1 lb. of this product per gallon of water.
Read more about NUTRA-PHOS CALZINC
