Nitrogen is one of the most important nutrient required for high onion yields. Onions are known as gross feeders and crops can remove 2-3 kg of nitrogen for every tone harvested.
Influencing Onion and Garlic Bulb Number
The number of onions and garlic produced can be influenced by a variety of factors, for example, plant density. Planting crops at higher densities can result in greater number of onion bulbs, but in lower size. Thus, it is important to manipulate sowing density to provide maximum yields of a desired bulb size. A balanced fertilization program will help to reach yield potentials.
Crop Nutrition and Onion and Garlic Number
Nitrogen
Potassium
Potassium is important for high yields in onion and garlic crops. It is the second most utilized nutrient and uptake peaks during bulb formation and enlargement. However, care has to be taken as over-application can lead to yield reductions.
Calcium
Studies with calcium nitrate confirm this is one of the most effective forms for high yields.
Zinc
Recommended Yara Fertilizers for Onions
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YaraMila COMPLEX
12-4.8-14.9 + 8% S - Prilled NPK fertilizer which also contains magnesium and sulphur as well as micronutrients ideal for use on a wide range of arable and horticultural crops.
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YaraLiva TROPICOTE
15.5% N + 18.8% Ca - Granular calcium nitrate fertilizer for field application to a wide range of crops.
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MAINCROP S
14-5.7-17.4 + 2.2% S - A quality size matched NPK plus S size matched blended fertilizer, ideal for use for potato production due to the ratio in the of N P and K whilst including a useful amount of sulphur.
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STARTER SOLUTION PLUS
A liquid fertilizer for placement which aids rapid crop establishment, promotes efficient utilization of phosphate and improves phosphate availability.
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YaraVita BORTRAC 150
A liquid micronutrient fertilizer containing 150 g/l boron for foliar application to provide additional boron or to treat boron deficiencies in a wide range of crops.
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YaraVita BRASSITREL PRO
A flowable liquid suspension fertilizer with a combination of micronutrients including manganese, magnesium, boron and molybdenum for foliar application to oilseed rape, brassicas and legumes.